rfc9559.original.xml   rfc9559.xml 
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<rfc version="3" ipr="trust200902" docName="draft-ietf-cellar-matroska-21" numbe
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sortRefs="true" symRefs="true" tocDepth="4" xml:lang="en" xmlns:xi="http://www.
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<!-- [rfced] Should "Specifications" (plural) in the document title be updated
to "Specification" (singular)? Or is the current correct?
Original:
Matroska Media Container Format Specifications
Perhaps:
Matroska Media Container Format Specification
-->
<front> <front>
<title abbrev="Matroska Format">Matroska Media Container Format Specifications</ <title abbrev="Matroska Format">Matroska Media Container Format Specifications
title><seriesInfo value="draft-ietf-cellar-matroska-21" stream="IETF" status="st </title>
andard" name="Internet-Draft"></seriesInfo> <seriesInfo name="RFC" value="9559"/>
<author initials="S." surname="Lhomme" fullname="Steve Lhomme"><organization></o
rganization><address><postal><street></street>
</postal><email>slhomme@matroska.org</email>
</address></author><author initials="M." surname="Bunkus" fullname="Moritz Bunku
s"><organization></organization><address><postal><street></street>
</postal><email>moritz@bunkus.org</email>
</address></author><author initials="D." surname="Rice" fullname="Dave Rice"><or
ganization></organization><address><postal><street></street>
</postal><email>dave@dericed.com</email>
</address></author><date year="2023" month="October" day="22"></date>
<area>art</area>
<workgroup>CELLAR Group</workgroup>
<keyword>binary</keyword>
<keyword>storage</keyword>
<keyword>matroska</keyword>
<keyword>ebml</keyword>
<keyword>webm</keyword>
<author initials="S." surname="Lhomme" fullname="Steve Lhomme">
<organization></organization>
<address>
<postal>
<street></street>
</postal>
<email>slhomme@matroska.org</email>
</address>
</author>
<author initials="M." surname="Bunkus" fullname="Moritz Bunkus">
<organization></organization>
<address>
<postal>
<street></street>
</postal>
<email>moritz@bunkus.org</email>
</address>
</author>
<author initials="D." surname="Rice" fullname="Dave Rice">
<organization></organization>
<address>
<postal>
<street></street>
</postal>
<email>dave@dericed.com</email>
</address>
</author>
<date year="2024" month="April" />
<area>art</area>
<workgroup>cellar</workgroup>
<keyword>binary</keyword>
<keyword>storage</keyword>
<keyword>matroska</keyword>
<keyword>ebml</keyword>
<keyword>webm</keyword>
<abstract> <abstract>
<t>This document defines the Matroska audiovisual data container structure, incl <t>This document defines the Matroska audiovisual data container structure,
uding definitions of its structural elements, including definitions of its structural elements, terminology,
as well as its terminology, vocabulary, and application.</t> vocabulary, and application.</t>
<t>This document updates <xref target="RFC8794"></xref> to permit the use of a p <t>This document updates RFC 8794 to permit the use of a previously reserved Ext
reviously reserved EBML Element ID.</t> ensible Binary Meta Language (EBML) Element ID.</t>
</abstract> </abstract>
</front> </front>
<middle> <middle>
<section anchor="introduction"><name>Introduction</name> <section anchor="introduction"><name>Introduction</name>
<t>Matroska is an audiovisual data container format. It was derived from a proje <t>Matroska is an audiovisual data container format. It was derived from a
ct called <xref target="MCF"></xref>, project called <xref target="MCF"></xref> but diverges from it
but diverges from it significantly because it is based on EBML (Extensible Binar significantly because it is based on EBML (Extensible Binary Meta Language)
y Meta Language) <xref target="RFC8794"></xref>, <xref target="RFC8794"></xref>, a binary derivative of XML. EBML
a binary derivative of XML. EBML provides significant advantages in terms of fut provides significant advantages in terms of future format extensibility,
ure format extensibility,
without breaking file support in parsers reading the previous versions.</t> without breaking file support in parsers reading the previous versions.</t>
<t>First, it is essential to clarify exactly &quot;What an Audio/Video container is&quot;, to avoid any misunderstandings:</t>
<ul spacing="compact"> <t>To avoid any misunderstandings, it is essential to clarify exactly
<li>It is NOT a video or audio compression format (codec)</li> what an audio/video container is:</t>
<ul>
<li>It is NOT a video or audio compression format (codec).</li>
<li>It is an envelope in which there can be many audio, video, and subtitles str eams, <li>It is an envelope in which there can be many audio, video, and subtitles str eams,
allowing the user to store a complete movie or CD in a single file.</li> allowing the user to store a complete movie or CD in a single file.</li>
</ul> </ul>
<t>Matroska is designed with the future in mind. It incorporates features such a s:</t> <t>Matroska is designed with the future in mind. It incorporates features such a s:</t>
<ul spacing="compact"> <ul>
<li>Fast seeking in the file</li> <li>Fast seeking in the file</li>
<li>Chapter entries</li> <li>Chapter entries</li>
<li>Full metadata (tags) support</li> <li>Full metadata (tags) support</li>
<li>Selectable subtitle/audio/video streams</li> <li>Selectable subtitle/audio/video streams</li>
<li>Modularly expandable</li> <li>Modularly expandable</li>
<li>Error resilience (can recover playback even when the stream is damaged)</li> <li>Error resilience (can recover playback even when the stream is damaged)</li>
<li>Streamable over the internet and local networks (HTTP <xref target="RFC9110" <li>Streamable over the Internet and local networks (HTTP <xref target="RFC9110"
></xref>, FTP <xref target="RFC0959"></xref>, SMB <xref target="SMB-CIFS"></xref ></xref>, FTP <xref target="RFC0959"></xref>, SMB <xref target="SMB-CIFS"></xref
>, etc.)</li> >, etc.)</li>
<li>Menus (like DVDs have <xref target="DVD-Video"></xref>)</li> <li>Menus (like menus that DVDs have <xref target="DVD-Video"></xref>)</li>
</ul> </ul>
</section> </section>
<section anchor="status-of-this-document"><name>Status of this document</name> <section anchor="status-of-this-document"><name>Status of This Document</name>
<t>This document covers Matroska versions 1, 2, 3 and 4. Matroska v4 is the curr <t>This document covers Matroska versions 1, 2, 3, and 4. Matroska version 4 is
ent version. the current version.
Matroska 1 to 3 are no longer maintained. No new elements are expected in files Matroska versions 1 to 3 are no longer maintained. No new elements are expected
with version numbers 1, 2, or 3.</t> in files with version numbers 1, 2, or 3.</t>
</section> </section>
<section anchor="notation-and-conventions"><name>Notation and Conventions</name> <section anchor="notation-and-conventions"><name>Notation and Conventions</name>
<t>The key words &quot;<bcp14>MUST</bcp14>&quot;, &quot;<bcp14>MUST NOT</bcp14>& <t>
quot;, The key words "<bcp14>MUST</bcp14>", "<bcp14>MUST NOT</bcp14>",
&quot;<bcp14>REQUIRED</bcp14>&quot;, &quot;<bcp14>SHALL</bcp14>&quot;, &quot;<bc "<bcp14>REQUIRED</bcp14>", "<bcp14>SHALL</bcp14>", "<bcp14>SHALL
p14>SHALL NOT</bcp14>&quot;, NOT</bcp14>", "<bcp14>SHOULD</bcp14>", "<bcp14>SHOULD NOT</bcp14>",
&quot;<bcp14>SHOULD</bcp14>&quot;, &quot;<bcp14>SHOULD NOT</bcp14>&quot;, "<bcp14>RECOMMENDED</bcp14>", "<bcp14>NOT RECOMMENDED</bcp14>",
&quot;<bcp14>RECOMMENDED</bcp14>&quot;, &quot;<bcp14>NOT RECOMMENDED</bcp14>&quo "<bcp14>MAY</bcp14>", and "<bcp14>OPTIONAL</bcp14>" in this document are
t;, to be interpreted as described in BCP&nbsp;14 <xref target="RFC2119"/>
&quot;<bcp14>MAY</bcp14>&quot;, and &quot;<bcp14>OPTIONAL</bcp14>&quot; in this <xref target="RFC8174"/> when, and only when, they appear in all capitals,
document are to be interpreted as as shown here. </t>
described in BCP 14 <xref target="RFC2119"></xref> <xref target="RFC8174"></xref
>
when, and only when, they appear in all capitals, as shown here.</t>
<t>This document defines specific terms in order to define the format and applic
ation of <tt>Matroska</tt>.
Specific terms are defined below:</t>
<dl spacing="compact"> <t>This document defines the following terms in order to
define the format and application of <tt>Matroska</tt>:
</t>
<dl>
<dt><tt>Matroska</tt>:</dt> <dt><tt>Matroska</tt>:</dt>
<dd>A multimedia container format based on EBML (Extensible Binary Meta Language ).</dd> <dd>A multimedia container format based on EBML (Extensible Binary Meta Language ).</dd>
<dt><tt>Matroska Reader</tt>:</dt> <dt><tt>Matroska Reader</tt>:</dt>
<dd>A data parser that interprets the semantics of a Matroska document and creat es a way for programs to use <tt>Matroska</tt>.</dd> <dd>A data parser that interprets the semantics of a Matroska document and creat es a way for programs to use <tt>Matroska</tt>.</dd>
<dt><tt>Matroska Player</tt>:</dt> <dt><tt>Matroska Player</tt>:</dt>
<dd>A <tt>Matroska Reader</tt> with a primary purpose of playing audiovisual fil es, including <tt>Matroska</tt> documents.</dd> <dd>A <tt>Matroska Reader</tt> with the primary purpose of playing audiovisual f iles, including <tt>Matroska</tt> documents.</dd>
<dt><tt>Matroska Writer</tt>:</dt> <dt><tt>Matroska Writer</tt>:</dt>
<dd>A data writer that creates <tt>Matroska</tt> documents.</dd> <dd>A data writer that creates <tt>Matroska</tt> documents.</dd>
</dl> </dl>
</section> </section>
<section anchor="matroska-overview"><name>Matroska Overview</name> <section anchor="matroska-overview"><name>Matroska Overview</name>
<section anchor="principles"><name>Principles</name> <section anchor="principles"><name>Principles</name>
<t>Matroska is a Document Type of EBML (Extensible Binary Meta Language). <t>Matroska is a Document Type of EBML.
This specification is dependent on the EBML Specification <xref target="RFC8794" This specification is dependent on the EBML specification <xref target="RFC8794"
></xref>. ></xref>.
For an understanding of Matroska's EBML Schema, see in particular the sections o For an understanding of Matroska's EBML Schema, see in particular the sections o
f the EBML Specification covering f the EBML specification that cover
EBML Element Types (Section 7), EBML Element Types (Section <xref target="RFC8794" sectionFormat="bare" section=
EBML Schema (Section 11.1), "7"/>),
and EBML Structure (Section 3).</t> EBML Schema (Section <xref target="RFC8794" sectionFormat="bare" section="11.1"/
>),
and EBML Structure (Section <xref target="RFC8794" sectionFormat="bare" section=
"3"/>).</t>
</section> </section>
<section anchor="updates-to-rfc-8794"><name>Updates to RFC 8794</name> <section anchor="updates-to-rfc-8794"><name>Updates to RFC 8794</name>
<t>Because of an oversight, <xref target="RFC8794"></xref> reserved EBML ID 0x80 , which is used by deployed Matroska implementations. <t>Because of an oversight, <xref target="RFC8794"></xref> reserved EBML ID 0x80 , which is used by deployed Matroska implementations.
For this reason, this specification updates <xref target="RFC8794"></xref> to ma
ke 0x80 a legal EBML ID.
Specifically, the following are changed in <xref target="RFC8794"></xref>:</t>
<ul spacing="compact"> For this reason, this specification updates <xref target="RFC8794"></xref> to ma
<li>From Errata 7189</li> ke 0x80 a legal EBML ID. Additionally, this specification makes the following up
</ul> dates:</t>
<t>In Section 17.1,</t>
<ul>
<li><t><xref target="RFC8794" sectionFormat="of" section="17.1"/> (per Erratum I
D #7189 <xref target="Err7189"/>)</t>
<t>OLD:</t> <t>OLD:</t>
<t>One-octet Element IDs MUST be between 0x81 and 0xFE. These items are <blockquote>
<t>One-octet Element IDs <bcp14>MUST</bcp14> be between 0x81 and 0xFE. These it
ems are
valuable because they are short, and they need to be used for valuable because they are short, and they need to be used for
commonly repeated elements. Element IDs are to be allocated within commonly repeated elements. Element IDs are to be allocated within
this range according to the &quot;RFC Required&quot; policy [RFC8126].</t> this range according to the "RFC Required" policy <xref target="RFC8126"/>.</ t>
<t>The following one-octet Element IDs are RESERVED: 0xFF and 0x80.</t> <t>The following one-octet Element IDs are RESERVED: 0xFF and 0x80.</t>
</blockquote>
<t>NEW:</t> <t>NEW:</t>
<t>One-octet Element IDs MUST be between 0x80 and 0xFE. These items are <blockquote>
<t>One-octet Element IDs <bcp14>MUST</bcp14> be between 0x80 and 0xFE. These it
ems are
valuable because they are short, and they need to be used for valuable because they are short, and they need to be used for
commonly repeated elements. Element IDs are to be allocated within commonly repeated elements. Element IDs are to be allocated within
this range according to the &quot;RFC Required&quot; policy [RFC8126].</t> this range according to the "RFC Required" policy <xref target="RFC8126"/>.</ t>
<t>The following one-octet Element ID is RESERVED: 0xFF.</t> <t>The following one-octet Element ID is RESERVED: 0xFF.</t>
</blockquote>
</li>
<ul spacing="compact"> <li><t><xref target="RFC8794" sectionFormat="of" section="5"/> (per Erratum ID #
<li>From Errata 7191</li> 7191 <xref target="Err7191"/>)</t>
</ul>
<t>In Section 5,</t>
<t>OLD:</t>
<artwork> +=========================+================+=================+ <t>OLD:</t>
| Element ID Octet Length | Range of Valid | Number of Valid | <artwork>
| | Element IDs | Element IDs | +=========================+================+=================+
+=========================+================+=================+ | Element ID Octet Length | Range of Valid | Number of Valid |
| 1 | 0x81 - 0xFE | 126 | | | Element IDs | Element IDs |
+-------------------------+----------------+-----------------+ +=========================+================+=================+
| 1 | 0x81 - 0xFE | 126 |
+-------------------------+----------------+-----------------+
</artwork> </artwork>
-------------------------+----------------+-----------------+
<t>NEW:</t> <t>NEW:</t>
<artwork> +=========================+================+=================+ <artwork>
| Element ID Octet Length | Range of Valid | Number of Valid | +=========================+================+=================+
| | Element IDs | Element IDs | | Element ID Octet Length | Range of Valid | Number of Valid |
+=========================+================+=================+ | | Element IDs | Element IDs |
| 1 | 0x80 - 0xFE | 127 | +=========================+================+=================+
+-------------------------+----------------+-----------------+ | 1 | 0x80 - 0xFE | 127 |
+-------------------------+----------------+-----------------+
</artwork> </artwork>
-------------------------+----------------+-----------------+
</li>
</ul>
</section> </section>
<section anchor="added-ebml-constraints"><name>Added EBML Constraints</name> <section anchor="added-ebml-constraints"><name>Added EBML Constraints</name>
<t>As an EBML Document Type, Matroska adds the following constraints to the EBML specification.</t> <t>As an EBML Document Type, Matroska adds the following constraints to the EBML specification <xref target="RFC8794"></xref>:</t>
<ul spacing="compact"> <ul>
<li>The <tt>docType</tt> of the <tt>EBML Header</tt> <bcp14>MUST</bcp14> be &quo <li>The <tt>docType</tt> of the <tt>EBML Header</tt> <bcp14>MUST</bcp14> be "mat
t;matroska&quot;.</li> roska".</li>
<li>The <tt>EBMLMaxIDLength</tt> of the <tt>EBML Header</tt> <bcp14>MUST</bcp14> be 4.</li> <li>The <tt>EBMLMaxIDLength</tt> of the <tt>EBML Header</tt> <bcp14>MUST</bcp14> be 4.</li>
<li>The <tt>EBMLMaxSizeLength</tt> of the <tt>EBML Header</tt> <bcp14>MUST</bcp1 4> be between 1 and 8 inclusive.</li> <li>The <tt>EBMLMaxSizeLength</tt> of the <tt>EBML Header</tt> <bcp14>MUST</bcp1 4> be between 1 and 8, inclusive.</li>
</ul> </ul>
</section> </section>
<section anchor="design-rules"><name>Design Rules</name> <section anchor="design-rules"><name>Design Rules</name>
<t>The Root Element and all Top-Levels Elements <bcp14>MUST</bcp14> use 4 octets
for their EBML Element ID -- i.e. Segment and direct children of Segment.</t> <t>The Root Element and all Top-Level Elements <bcp14>MUST</bcp14> use 4 octets
<t>Legacy EBML/Matroska parsers did not handle Empty Elements properly, elements for their EBML Element ID -- i.e., Segment and direct children of Segment.</t>
present in the file but with a length of zero.
They always assumed the value was 0 for integers/dates or 0x0p+0, the textual ex <t>Legacy EBML/Matroska parsers did not handle Empty Elements properly; elements
pression of floats using the <xref target="ISO9899"></xref> format, no matter th were present in the file but had a length of 0.
e default value of the element which should have been used instead. They always assumed the value was 0 for integers/dates or 0x0p+0, the textual ex
Therefore, Matroska writers <bcp14>MUST NOT</bcp14> use EBML Empty Elements, if pression of floats using the format in <xref target="ISO9899"></xref>, no matter
the element has a default value that is not 0 for integers/dates and 0x0p+0 for the default value of the element that should have been used instead.
floats.</t> Therefore, Matroska Writers <bcp14>MUST NOT</bcp14> use EBML Empty Elements if t
he element has a default value that is not 0 for integers/dates and 0x0p+0 for f
loats.</t>
<t>When adding new elements to Matroska, these rules apply:</t> <t>When adding new elements to Matroska, these rules apply:</t>
<ul spacing="compact"> <ul>
<li>A non-mandatory integer/date Element <bcp14>MUST NOT</bcp14> have a default value other than 0.</li> <li>A non-mandatory integer/date Element <bcp14>MUST NOT</bcp14> have a default value other than 0.</li>
<li>A non-mandatory float Element <bcp14>MUST NOT</bcp14> have a default value o ther than 0x0p+0.</li> <li>A non-mandatory float Element <bcp14>MUST NOT</bcp14> have a default value o ther than 0x0p+0.</li>
<li>A non-mandatory string Element <bcp14>MUST NOT</bcp14> have a default value , as empty string cannot be defined in the XML Schema.</li> <li>A non-mandatory string Element <bcp14>MUST NOT</bcp14> have a default value , as empty strings cannot be defined in the XML Schema.</li>
</ul> </ul>
</section> </section>
<section anchor="data-layout"><name>Data Layout</name> <section anchor="data-layout"><name>Data Layout</name>
<t>A Matroska file <bcp14>MUST</bcp14> be composed of at least one <tt>EBML Docu ment</tt> using the <tt>Matroska Document Type</tt>. <t>A Matroska file <bcp14>MUST</bcp14> be composed of at least one <tt>EBML Docu ment</tt> using the <tt>Matroska Document Type</tt>.
Each <tt>EBML Document</tt> <bcp14>MUST</bcp14> start with an <tt>EBML Header</t Each <tt>EBML Document</tt> <bcp14>MUST</bcp14> start with an <tt>EBML Header</t
t> and <bcp14>MUST</bcp14> be followed by the <tt>EBML Root Element</tt>, t> and <bcp14>MUST</bcp14> be followed by the <tt>EBML Root Element</tt>, define
defined as <tt>Segment</tt> in Matroska. Matroska defines several <tt>Top-Level d as <tt>Segment</tt> in Matroska. Matroska defines several <tt>Top-Level Elemen
Elements</tt> ts</tt>
which may occur within the <tt>Segment</tt>.</t> that may occur within the <tt>Segment</tt>.</t>
<t>As an example, a simple Matroska file consisting of a single <tt>EBML Documen t</tt> could be represented like this:</t> <t>As an example, a simple Matroska file consisting of a single <tt>EBML Documen t</tt> could be represented like this:</t>
<ul spacing="compact"> <ul spacing="compact">
<li><tt>EBML Header</tt></li> <li><tt>EBML Header</tt></li>
<li><tt>Segment</tt></li> <li><tt>Segment</tt></li>
</ul> </ul>
<t>A more complex Matroska file consisting of an <tt>EBML Stream</tt> (consistin g of two <tt>EBML Documents</tt>) could be represented like this:</t> <t>A more complex Matroska file consisting of an <tt>EBML Stream</tt> (consistin g of two <tt>EBML Documents</tt>) could be represented like this:</t>
<ul spacing="compact"> <ul spacing="compact">
<li><tt>EBML Header</tt></li> <li><tt>EBML Header</tt></li>
<li><tt>Segment</tt></li> <li><tt>Segment</tt></li>
<li><tt>EBML Header</tt></li> <li><tt>EBML Header</tt></li>
<li><tt>Segment</tt></li> <li><tt>Segment</tt></li>
</ul> </ul>
<t>The following diagram represents a simple Matroska file, comprised of an <tt> EBML Document</tt> <t>The following diagram represents a simple Matroska file, comprised of an <tt> EBML Document</tt>
with an <tt>EBML Header</tt>, a <tt>Segment Element</tt> (the <tt>Root Element</ tt>), and all eight Matroska with an <tt>EBML Header</tt>, a <tt>Segment Element</tt> (the <tt>Root Element</ tt>), and all eight Matroska
<tt>Top-Level Elements</tt>. In the following diagrams of this section, horizont al spacing expresses <tt>Top-Level Elements</tt>. In the diagrams in this section, horizontal spacing expresses
a parent-child relationship between Matroska Elements (e.g., the <tt>Info Elemen t</tt> is contained within a parent-child relationship between Matroska Elements (e.g., the <tt>Info Elemen t</tt> is contained within
the <tt>Segment Element</tt>) whereas vertical alignment represents the storage the <tt>Segment Element</tt>), whereas vertical alignment represents the storage
order within the file.</t> order within the file.</t>
<figure><name>Basic layout of a Matroska file. <figure><name>Basic Layout of a Matroska File</name>
</name> <artwork>
<artwork>+-------------+ +-------------+
| EBML Header | | EBML Header |
+---------------------------+ +---------------------------+
| Segment | SeekHead | | Segment | SeekHead |
| |-------------| | |-------------|
| | Info | | | Info |
| |-------------| | |-------------|
| | Tracks | | | Tracks |
| |-------------| | |-------------|
| | Chapters | | | Chapters |
| |-------------| | |-------------|
skipping to change at line 216 skipping to change at line 276
| | Cues | | | Cues |
| |-------------| | |-------------|
| | Attachments | | | Attachments |
| |-------------| | |-------------|
| | Tags | | | Tags |
+---------------------------+ +---------------------------+
</artwork> </artwork>
</figure> </figure>
<t>The Matroska <tt>EBML Schema</tt> defines eight <tt>Top-Level Elements</tt>:< /t> <t>The Matroska <tt>EBML Schema</tt> defines eight <tt>Top-Level Elements</tt>:< /t>
<ul spacing="compact"> <ul>
<li><tt>SeekHead</tt> (<xref target="seekhead"></xref>),</li> <li><tt>SeekHead</tt> (<xref target="seekhead"></xref>)</li>
<li><tt>Info</tt> (<xref target="info"></xref>),</li> <li><tt>Info</tt> (<xref target="info"></xref>)</li>
<li><tt>Tracks</tt> (<xref target="track-flags"></xref>),</li> <li><tt>Tracks</tt> (<xref target="track-flags"></xref>)</li>
<li><tt>Chapters</tt> (<xref target="chapters"></xref>),</li> <li><tt>Chapters</tt> (<xref target="chapters"></xref>)</li>
<li><tt>Cluster</tt> (<xref target="cluster-blocks"></xref>),</li> <li><tt>Cluster</tt> (<xref target="cluster-blocks"></xref>)</li>
<li><tt>Cues</tt> (<xref target="cues"></xref>),</li> <li><tt>Cues</tt> (<xref target="cues"></xref>)</li>
<li><tt>Attachments</tt> (<xref target="attachments-1"></xref>),</li> <li><tt>Attachments</tt> (<xref target="attachments-1"></xref>)</li>
<li>and <tt>Tags</tt> (<xref target="tags"></xref>).</li> <li><tt>Tags</tt> (<xref target="tags"></xref>)</li>
</ul> </ul>
<t>The <tt>SeekHead Element</tt> (also known as <tt>MetaSeek</tt>) contains an i ndex of <tt>Top-Level Elements</tt> <t>The <tt>SeekHead Element</tt> (also known as <tt>MetaSeek</tt>) contains an i ndex of <tt>Top-Level Elements</tt>
locations within the <tt>Segment</tt>. Use of the <tt>SeekHead Element</tt> is < bcp14>RECOMMENDED</bcp14>. Without a <tt>SeekHead Element</tt>, locations within the <tt>Segment</tt>. Use of the <tt>SeekHead Element</tt> is < bcp14>RECOMMENDED</bcp14>. Without a <tt>SeekHead Element</tt>,
a Matroska parser would have to search the entire file to find all of the other <tt>Top-Level Elements</tt>. a Matroska parser would have to search the entire file to find all of the other <tt>Top-Level Elements</tt>.
This is due to Matroska's flexible ordering requirements; for instance, it is ac ceptable for This is due to Matroska's flexible ordering requirements; for instance, it is ac ceptable for
the <tt>Chapters Element</tt> to be stored after the <tt>Cluster Elements</tt>.< the <tt>Chapters Element</tt> to be stored after the <tt>Cluster Element</tt>.</
/t> t>
<figure><name>Representation of a <tt>SeekHead Element</tt>. <figure><name>Representation of a <tt>SeekHead Element</tt>
</name> </name>
<artwork>+--------------------------------+ <artwork>
+--------------------------------+
| SeekHead | Seek | SeekID | | SeekHead | Seek | SeekID |
| | |--------------| | | |--------------|
| | | SeekPosition | | | | SeekPosition |
+--------------------------------+ +--------------------------------+
</artwork> </artwork>
</figure> </figure>
<t>The <tt>Info Element</tt> contains vital information for identifying the whol e <tt>Segment</tt>. <t>The <tt>Info Element</tt> contains vital information for identifying the whol e <tt>Segment</tt>.
This includes the title for the <tt>Segment</tt>, a randomly generated unique id This includes the title for the <tt>Segment</tt>, a randomly generated unique id
entifier, entifier (UID),
and the unique identifier(s) of any linked <tt>Segment Elements</tt>.</t> and the UID(s) of any linked <tt>Segment Elements</tt>.</t>
<figure><name>Representation of an <tt>Info Element</tt> and its <tt>Child Eleme <figure><name>Representation of an <tt>Info Element</tt> and Its <tt>Child Eleme
nts</tt>. nts</tt>
</name> </name>
<artwork>+-------------------------+ <artwork>
+-------------------------+
| Info | SegmentUUID | | Info | SegmentUUID |
| |------------------| | |------------------|
| | SegmentFilename | | | SegmentFilename |
| |------------------| | |------------------|
| | PrevUUID | | | PrevUUID |
| |------------------| | |------------------|
| | PrevFilename | | | PrevFilename |
| |------------------| | |------------------|
| | NextUUID | | | NextUUID |
| |------------------| | |------------------|
skipping to change at line 277 skipping to change at line 339
| |------------------| | |------------------|
| | Title | | | Title |
| |------------------| | |------------------|
| | MuxingApp | | | MuxingApp |
| |------------------| | |------------------|
| | WritingApp | | | WritingApp |
|-------------------------| |-------------------------|
</artwork> </artwork>
</figure> </figure>
<t>The <tt>Tracks Element</tt> defines the technical details for each track and can store the name, <t>The <tt>Tracks Element</tt> defines the technical details for each track and can store the name,
number, unique identifier, language, and type (audio, video, subtitles, etc.) of each track. number, UID, language, and type (audio, video, subtitles, etc.) of each track.
For example, the <tt>Tracks Element</tt> <bcp14>MAY</bcp14> store information ab out the resolution of a video track For example, the <tt>Tracks Element</tt> <bcp14>MAY</bcp14> store information ab out the resolution of a video track
or sample rate of an audio track.</t> or sample rate of an audio track.</t>
<t>The <tt>Tracks Element</tt> <bcp14>MUST</bcp14> identify all the data needed by the codec to decode the data of the <t>The <tt>Tracks Element</tt> <bcp14>MUST</bcp14> identify all the data needed by the codec to decode the data of the
specified track. However, the data required is contingent on the codec used for the track. specified track. However, the data required is contingent on the codec used for the track.
For example, a <tt>Track Element</tt> for uncompressed audio only requires the a udio bit rate to be present. For example, a <tt>Track Element</tt> for uncompressed audio only requires the a udio bit rate to be present.
A codec such as AC-3 would require that the <tt>CodecID Element</tt> be present for all tracks, A codec such as AC-3 would require that the <tt>CodecID Element</tt> be present for all tracks,
as it is the primary way to identify which codec to use to decode the track.</t> as it is the primary way to identify which codec to use to decode the track.</t>
<figure><name>Representation of the <tt>Tracks Element</tt> and a selection of i ts <tt>Descendant Elements</tt>. <figure><name>Representation of the <tt>Tracks Element</tt> and a Selection of I ts <tt>Descendant Elements</tt>
</name> </name>
<artwork>+------------------------------------+ <artwork>
+------------------------------------+
| Tracks | TrackEntry | TrackNumber | | Tracks | TrackEntry | TrackNumber |
| | |--------------| | | |--------------|
| | | TrackUID | | | | TrackUID |
| | |--------------| | | |--------------|
| | | TrackType | | | | TrackType |
| | |--------------| | | |--------------|
| | | Name | | | | Name |
| | |--------------| | | |--------------|
| | | Language | | | | Language |
| | |--------------| | | |--------------|
skipping to change at line 330 skipping to change at line 393
| | | | AspectRatioType | | | | | AspectRatioType |
| | | |-------------------| | | | |-------------------|
| | | | Color | | | | | Color |
| | |----------------------------------| | | |----------------------------------|
| | | Audio | SamplingFrequency | | | | Audio | SamplingFrequency |
| | | |-------------------| | | | |-------------------|
| | | | Channels | | | | | Channels |
| | | |-------------------| | | | |-------------------|
| | | | BitDepth | | | | | BitDepth |
|--------------------------------------------------------| |--------------------------------------------------------|
</artwork> </artwork>
</figure> </figure>
<t>The <tt>Chapters Element</tt> lists all of the chapters. Chapters are a way t o set predefined <t>The <tt>Chapters Element</tt> lists all of the chapters. Chapters are a way t o set predefined
points to jump to in video or audio.</t> points to jump to in video or audio.</t>
<figure><name>Representation of the <tt>Chapters Element</tt> and a selection of its <tt>Descendant Elements</tt>. <figure><name>Representation of the <tt>Chapters Element</tt> and a Selection of Its <tt>Descendant Elements</tt>
</name> </name>
<artwork>+-----------------------------------------+ <artwork>
+-----------------------------------------+
| Chapters | Edition | EditionUID | | Chapters | Edition | EditionUID |
| | Entry |--------------------| | | Entry |--------------------|
| | | EditionFlagDefault | | | | EditionFlagDefault |
| | |--------------------| | | |--------------------|
| | | EditionFlagOrdered | | | | EditionFlagOrdered |
| | |---------------------------------+ | | |---------------------------------+
| | | ChapterAtom | ChapterUID | | | | ChapterAtom | ChapterUID |
| | | |-------------------| | | | |-------------------|
| | | | ChapterStringUID | | | | | ChapterStringUID |
| | | |-------------------| | | | |-------------------|
skipping to change at line 362 skipping to change at line 425
| | | | ChapterFlagHidden | | | | | ChapterFlagHidden |
| | | |-------------------------------+ | | | |-------------------------------+
| | | | ChapterDisplay | ChapString | | | | | ChapterDisplay | ChapString |
| | | | |--------------| | | | | |--------------|
| | | | | ChapLanguage | | | | | | ChapLanguage |
+------------------------------------------------------------------+ +------------------------------------------------------------------+
</artwork> </artwork>
</figure> </figure>
<t><tt>Cluster Elements</tt> contain the content for each track, e.g., video fra mes. A Matroska file <t><tt>Cluster Elements</tt> contain the content for each track, e.g., video fra mes. A Matroska file
<bcp14>SHOULD</bcp14> contain at least one <tt>Cluster Element</tt>. <bcp14>SHOULD</bcp14> contain at least one <tt>Cluster Element</tt>.
In the rare case it doesn't, there should be a form of Segment linking with othe <!-- [rfced] How may we clarify "a form of Segment linking with other
r Segments, possibly using Chapters, see <xref target="linked-segments"></xref>. Segments"?
</t>
Original:
In the rare case it doesn't, there should be a form of Segment
linking with other Segments, possibly using Chapters, see Section 17.
Perhaps:
In the rare case it doesn't, there should be a method for Segments
to link together, possibly using Chapters; see Section 17.
-->
In the rare case it doesn't, there should be a form of Segment linking with othe
r Segments, possibly using Chapters; see <xref target="linked-segments"></xref>.
</t>
<t>The <tt>Cluster Element</tt> helps to break up <t>The <tt>Cluster Element</tt> helps to break up
<tt>SimpleBlock</tt> or <tt>BlockGroup Elements</tt> and helps with seeking and error protection. <tt>SimpleBlock</tt> or <tt>BlockGroup Elements</tt> and helps with seeking and error protection.
Every <tt>Cluster Element</tt> <bcp14>MUST</bcp14> contain a <tt>Timestamp Eleme nt</tt>. Every <tt>Cluster Element</tt> <bcp14>MUST</bcp14> contain a <tt>Timestamp Eleme nt</tt>.
This <bcp14>SHOULD</bcp14> be the <tt>Timestamp Element</tt> used to play the fi rst <tt>Block</tt> in the <tt>Cluster Element</tt>, This <bcp14>SHOULD</bcp14> be the <tt>Timestamp Element</tt> used to play the fi rst <tt>Block</tt> in the <tt>Cluster Element</tt>,
unless a different value is needed to accommodate for more Blocks, see <xref tar get="block-timestamps"></xref>.</t> unless a different value is needed to accommodate for more Blocks; see <xref tar get="block-timestamps"></xref>.</t>
<t><tt>Cluster Elements</tt> contain one or more block element, such as <tt>Bloc kGroup</tt> or <tt>SimpleBlock</tt> elements. <t><tt>Cluster Elements</tt> contain one or more block element, such as <tt>Bloc kGroup</tt> or <tt>SimpleBlock</tt> elements.
In some situations, a <tt>Cluster Element</tt> <bcp14>MAY</bcp14> contain no blo ck element, for example in a live recording In some situations, a <tt>Cluster Element</tt> <bcp14>MAY</bcp14> contain no blo ck element, for example, in a live recording
when no data has been collected.</t> when no data has been collected.</t>
<t>A <tt>BlockGroup Element</tt> <bcp14>MAY</bcp14> contain a <tt>Block</tt> of data and any information relating directly to that <tt>Block</tt>.</t> <t>A <tt>BlockGroup Element</tt> <bcp14>MAY</bcp14> contain a <tt>Block</tt> of data and any information relating directly to that <tt>Block</tt>.</t>
<figure><name>Representation of a <tt>Cluster Element</tt> and its immediate <tt >Child Elements</tt>. <figure><name>Representation of a <tt>Cluster Element</tt> and Its Immediate <tt >Child Elements</tt>
</name> </name>
<artwork>+--------------------------+ <artwork>
+--------------------------+
| Cluster | Timestamp | | Cluster | Timestamp |
| |----------------| | |----------------|
| | Position | | | Position |
| |----------------| | |----------------|
| | PrevSize | | | PrevSize |
| |----------------| | |----------------|
| | SimpleBlock | | | SimpleBlock |
| |----------------| | |----------------|
| | BlockGroup | | | BlockGroup |
+--------------------------+ +--------------------------+
</artwork> </artwork>
</figure> </figure>
<figure><name>Representation of the <tt>Block Element</tt> structure. <figure><name>Representation of the <tt>Block Element</tt> Structure
</name> </name>
<artwork>+----------------------------------+ <artwork>
+----------------------------------+
| Block | Portion of | Data Type | | Block | Portion of | Data Type |
| | a Block | - Bit Flag | | | a Block | - Bit Flag |
| |--------------------------+ | |--------------------------+
| | Header | TrackNumber | | | Header | TrackNumber |
| | |-------------| | | |-------------|
| | | Timestamp | | | | Timestamp |
| | |-------------| | | |-------------|
| | | Flags | | | | Flags |
| | | - Gap | | | | - Gap |
| | | - Lacing | | | | - Lacing |
| | | - Reserved | | | | - Reserved |
| |--------------------------| | |--------------------------|
| | Optional | FrameSize | | | Optional | FrameSize |
| |--------------------------| | |--------------------------|
| | Data | Frame | | | Data | Frame |
+----------------------------------+ +----------------------------------+
</artwork> </artwork>
</figure> </figure>
<t>Each <tt>Cluster</tt> <bcp14>MUST</bcp14> contain exactly one <tt>Timestamp E lement</tt>. The <tt>Timestamp Element</tt> value <bcp14>MUST</bcp14> <t>Each <tt>Cluster</tt> <bcp14>MUST</bcp14> contain exactly one <tt>Timestamp E lement</tt>. The <tt>Timestamp Element</tt> value <bcp14>MUST</bcp14>
be stored once per <tt>Cluster</tt>. The <tt>Timestamp Element</tt> in the <tt>C luster</tt> is relative to the entire <tt>Segment</tt>. be stored once per <tt>Cluster</tt>. The <tt>Timestamp Element</tt> in the <tt>C luster</tt> is relative to the entire <tt>Segment</tt>.
The <tt>Timestamp Element</tt> <bcp14>SHOULD</bcp14> be the first <tt>Element</t t> in the <tt>Cluster</tt> it belongs to, The <tt>Timestamp Element</tt> <bcp14>SHOULD</bcp14> be the first <tt>Element</t t> in the <tt>Cluster</tt> it belongs to
or the second <tt>Element</tt> if that Cluster contains a CRC-32 element (<xref target="crc-32"></xref>)</t> or the second <tt>Element</tt> if that Cluster contains a CRC-32 element (<xref target="crc-32"></xref>)</t>
<t>Additionally, the <tt>Block</tt> contains an offset that, when added to the < tt>Cluster</tt>'s <tt>Timestamp Element</tt> value, <t>Additionally, the <tt>Block</tt> contains an offset that, when added to the < tt>Cluster</tt>'s <tt>Timestamp Element</tt> value,
yields the <tt>Block</tt>'s effective timestamp. Therefore, timestamp in the <tt >Block</tt> itself is relative to yields the <tt>Block</tt>'s effective timestamp. Therefore, the timestamp in the <tt>Block</tt> itself is relative to
the <tt>Timestamp Element</tt> in the <tt>Cluster</tt>. For example, if the <tt> Timestamp Element</tt> in the <tt>Cluster</tt> the <tt>Timestamp Element</tt> in the <tt>Cluster</tt>. For example, if the <tt> Timestamp Element</tt> in the <tt>Cluster</tt>
is set to 10 seconds and a <tt>Block</tt> in that <tt>Cluster</tt> is supposed t o be played 12 seconds into the clip, is set to 10 seconds and a <tt>Block</tt> in that <tt>Cluster</tt> is supposed t o be played 12 seconds into the clip,
the timestamp in the <tt>Block</tt> would be set to 2 seconds.</t> the timestamp in the <tt>Block</tt> would be set to 2 seconds.</t>
<t>The <tt>ReferenceBlock</tt> in the <tt>BlockGroup</tt> is used instead of the <t>The <tt>ReferenceBlock</tt> in the <tt>BlockGroup</tt> is used instead of the
basic &quot;P-frame&quot;/&quot;B-frame&quot; description. basic "P-frame"/"B-frame" description.
Instead of simply saying that this <tt>Block</tt> depends on the <tt>Block</tt> Instead of simply saying that this <tt>Block</tt> depends on the <tt>Block</tt>
directly before, or directly afterwards, directly before or directly after,
the <tt>Timestamp</tt> of the necessary <tt>Block</tt> is used. Because there ca n be as many <tt>ReferenceBlock Elements</tt> the <tt>Timestamp</tt> of the necessary <tt>Block</tt> is used. Because there ca n be as many <tt>ReferenceBlock Elements</tt>
as necessary for a <tt>Block</tt>, it allows for some extremely complex referenc ing.</t> as necessary for a <tt>Block</tt>, it allows for some extremely complex referenc ing.</t>
<t>The <tt>Cues Element</tt> is used to seek when playing back a file by providi ng a temporal index <t>The <tt>Cues Element</tt> is used to seek when playing back a file by providi ng a temporal index
for some of the <tt>Tracks</tt>. It is similar to the <tt>SeekHead Element</tt>, but used for seeking to for some of the <tt>Tracks</tt>. It is similar to the <tt>SeekHead Element</tt> but is used for seeking to
a specific time when playing back the file. It is possible to seek without this element, a specific time when playing back the file. It is possible to seek without this element,
but it is much more difficult because a <tt>Matroska Reader</tt> would have to ' but it is much more difficult because a <tt>Matroska Reader</tt> would have to "
hunt and peck' hunt and peck"
through the file looking for the correct timestamp.</t> through the file to look for the correct timestamp.</t>
<t>The <tt>Cues Element</tt> <bcp14>SHOULD</bcp14> contain at least one <tt>CueP oint Element</tt>. Each <tt>CuePoint Element</tt> <t>The <tt>Cues Element</tt> <bcp14>SHOULD</bcp14> contain at least one <tt>CueP oint Element</tt>. Each <tt>CuePoint Element</tt>
stores the position of the <tt>Cluster</tt> that contains the <tt>BlockGroup</tt > or <tt>SimpleBlock Element</tt>. stores the position of the <tt>Cluster</tt> that contains the <tt>BlockGroup</tt > or <tt>SimpleBlock Element</tt>.
The timestamp is stored in the <tt>CueTime Element</tt> and location is stored i The timestamp is stored in the <tt>CueTime Element</tt>, and the location is sto
n the <tt>CueTrackPositions Element</tt>.</t> red in the <tt>CueTrackPositions Element</tt>.</t>
<t>The <tt>Cues Element</tt> is flexible. For instance, <tt>Cues Element</tt> ca <t>The <tt>Cues Element</tt> is flexible. For instance, the <tt>Cues Element</tt
n be used to index every > can be used to index every
single timestamp of every <tt>Block</tt> or they can be indexed selectively.</t> single timestamp of every <tt>Block</tt> or they can be indexed selectively.</t>
<figure><name>Representation of a <tt>Cues Element</tt> and two levels of its <t t>Descendant Elements</tt>. <figure><name>Representation of a <tt>Cues Element</tt> and Two Levels of Its <t t>Descendant Elements</tt>
</name> </name>
<artwork>+-------------------------------------+ <artwork>
+-------------------------------------+
| Cues | CuePoint | CueTime | | Cues | CuePoint | CueTime |
| | |-------------------| | | |-------------------|
| | | CueTrackPositions | | | | CueTrackPositions |
| |------------------------------| | |------------------------------|
| | CuePoint | CueTime | | | CuePoint | CueTime |
| | |-------------------| | | |-------------------|
| | | CueTrackPositions | | | | CueTrackPositions |
+-------------------------------------+ +-------------------------------------+
</artwork> </artwork>
</figure> </figure>
<t>The <tt>Attachments Element</tt> is for attaching files to a Matroska file su <t>The <tt>Attachments Element</tt> is for attaching files to a Matroska file, s
ch as pictures, uch as pictures,
fonts, webpages, etc.</t> fonts, web pages, etc.</t>
<figure><name>Representation of an <tt>Attachments Element</tt>. <figure><name>Representation of an <tt>Attachments Element</tt>
</name> </name>
<artwork>+------------------------------------------------+ <artwork>
+------------------------------------------------+
| Attachments | AttachedFile | FileDescription | | Attachments | AttachedFile | FileDescription |
| | |-------------------| | | |-------------------|
| | | FileName | | | | FileName |
| | |-------------------| | | |-------------------|
| | | FileMediaType | | | | FileMediaType |
| | |-------------------| | | |-------------------|
| | | FileData | | | | FileData |
| | |-------------------| | | |-------------------|
| | | FileUID | | | | FileUID |
| | |-------------------| | | |-------------------|
skipping to change at line 472 skipping to change at line 550
| | |-------------------| | | |-------------------|
| | | FileUsedStartTime | | | | FileUsedStartTime |
| | |-------------------| | | |-------------------|
| | | FileUsedEndTime | | | | FileUsedEndTime |
+------------------------------------------------+ +------------------------------------------------+
</artwork> </artwork>
</figure> </figure>
<t>The <tt>Tags Element</tt> contains metadata that describes the <tt>Segment</t t> and potentially <t>The <tt>Tags Element</tt> contains metadata that describes the <tt>Segment</t t> and potentially
its <tt>Tracks</tt>, <tt>Chapters</tt>, and <tt>Attachments</tt>. Each <tt>Track </tt> or <tt>Chapter</tt> that those tags its <tt>Tracks</tt>, <tt>Chapters</tt>, and <tt>Attachments</tt>. Each <tt>Track </tt> or <tt>Chapter</tt> that those tags
applies to has its UID listed in the <tt>Tags</tt>. The <tt>Tags</tt> contain al l extra information about applies to has its UID listed in the <tt>Tags</tt>. The <tt>Tags</tt> contain al l extra information about
the file: scriptwriter, singer, actors, directors, titles, edition, price, dates the file: scriptwriters, singers, actors, directors, titles, edition, price, dat
, genre, comments, es, genre, comments,
etc. Tags can contain their values in multiple languages. For example, a movie's etc. Tags can contain their values in multiple languages.
&quot;title&quot; <tt>Tag</tt> <!-- [rfced] May we update "the title it was released as in Germany" in one of
the following ways to improve readability?
Original:
For example, a movie's "title" Tag might contain both the original
English title as well as the title it was released as in Germany.
Perhaps:
For example, a movie's "title" Tag might contain both the original
English title as well as the German title.
Or:
For example, a movie's "title" Tag might contain both the original
English title as well as the title used when it was released in Germany.
-->
For example, a movie's "title" <tt>Tag</tt>
might contain both the original English title as well as the title it was releas ed as in Germany.</t> might contain both the original English title as well as the title it was releas ed as in Germany.</t>
<figure><name>Representation of a <tt>Tags Element</tt> and three levels of its <tt>Children Elements</tt>. <figure><name>Representation of a <tt>Tags Element</tt> and Three Levels of Its <tt>Children Elements</tt>
</name> </name>
<artwork>+-------------------------------------------+ <artwork>
+-------------------------------------------+
| Tags | Tag | Targets | TargetTypeValue | | Tags | Tag | Targets | TargetTypeValue |
| | | |------------------| | | | |------------------|
| | | | TargetType | | | | | TargetType |
| | | |------------------| | | | |------------------|
| | | | TagTrackUID | | | | | TagTrackUID |
| | | |------------------| | | | |------------------|
| | | | TagEditionUID | | | | | TagEditionUID |
| | | |------------------| | | | |------------------|
| | | | TagChapterUID | | | | | TagChapterUID |
| | | |------------------| | | | |------------------|
skipping to change at line 508 skipping to change at line 603
| | | | TagBinary | | | | | TagBinary |
| | | |------------------| | | | |------------------|
| | | | SimpleTag | | | | | SimpleTag |
+-------------------------------------------+ +-------------------------------------------+
</artwork> </artwork>
</figure> </figure>
</section> </section>
</section> </section>
<section anchor="matroska-schema"><name>Matroska Schema</name> <section anchor="matroska-schema"><name>Matroska Schema</name>
<t>This specification includes an <tt>EBML Schema</tt>, which defines the Elemen <!-- [rfced] We are having trouble understanding the second sentence below. Is
ts and structure it redundant with the first sentence? Should it be either deleted or rephrased?
of Matroska using the EBML Schema elements and attributes defined in Section 11.
1 of <xref target="RFC8794"></xref>. Original:
The EBML Schema defines every valid Matroska element in a manner defined by the This specification includes an EBML Schema, which defines the
EBML specification.</t> Elements and structure of Matroska using the EBML Schema elements and
<t>Attributes using their default value like <tt>minOccurs</tt>, <tt>minver</tt> attributes defined in Section 11.1 of [RFC8794]. The EBML Schema
, etc. or with undefined values like <tt>length</tt>, <tt>maxver</tt>, etc. are defines every valid Matroska element in a manner defined by the EBML
omitted.</t> specification.
<t>Here the definition of each Matroska Element is provided.</t>
Perhaps (delete second sentence):
This specification includes an EBML Schema that defines the
Elements and structure of Matroska using the EBML Schema elements and
attributes defined in Section 11.1 of [RFC8794].
Or (rephrase second sentence):
This specification includes an EBML Schema that defines the
Elements and structure of Matroska using the EBML Schema elements and
attributes defined in Section 11.1 of [RFC8794]. The EBML Schema in this doc
ument
defines every valid Matroska element in a manner defined by the EBML
specification [RFC8794].
-->
<t>This specification includes an <tt>EBML Schema</tt> that defines the Elements
and structure
of Matroska using the EBML Schema elements and attributes defined in <xref targe
t="RFC8794" sectionFormat="of" section="11.1"/>.
The EBML Schema defines every valid Matroska element in a manner defined by the
EBML specification <xref target="RFC8794"></xref>.</t>
<t>Attributes using their default value (like <tt>minOccurs</tt>, <tt>minver</tt
>, etc.) or attributes with undefined values (like <tt>length</tt>, <tt>maxver</
tt>, etc.) are omitted.</t>
<t>The definitions for each Matroska Element are provided below.</t>
<section anchor="segment-element"><name>Segment Element</name> <section anchor="segment-element"><name>Segment Element</name>
<!-- [rfced] FYI - To make the definition lists in Section 5.1 consistent
(especially when definitions appear after a table), we moved the tables out
of the definition lists.
-->
<!-- [rfced] The following sections include paragraphs that are not part of
the <dl>. Should these paragraphs be nested under "definition:"?
5.1.3.5.5
5.1.4.1.28.44
5.1.4.1.28.45
5.1.4.1.28.46
-->
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x18538067 / master</dd> <dd>0x18538067 / master</dd>
</dl> <dt>unknownsizeallowed:</dt>
<t>unknownsizeallowed: True</t> <dd>True</dd>
<dl spacing="compact">
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment</tt></dd> <dd><tt>\Segment</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The Root Element that contains all other Top-Level Elements; see <xref targe t="data-layout"></xref>.</dd> <dd>The Root Element that contains all other Top-Level Elements; see <xref targe t="data-layout"></xref>.</dd>
</dl> </dl>
<section anchor="seekhead-element"><name>SeekHead Element</name> <section anchor="seekhead-element"><name>SeekHead Element</name>
skipping to change at line 590 skipping to change at line 719
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The Segment Position (<xref target="segment-position"></xref>) of a Top-Leve l Element.</dd> <dd>The Segment Position (<xref target="segment-position"></xref>) of a Top-Leve l Element.</dd>
</dl> </dl>
</section> </section>
</section> </section>
</section> </section>
<section anchor="info-element"><name>Info Element</name> <section anchor="info-element"><name>Info Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x1549A966 / master</dd> <dd>0x1549A966 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info</tt></dd> <dd><tt>\Segment\Info</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
</dl> <dt>recurring:</dt><dd>True</dd>
<t>recurring: True</t>
<dl spacing="compact">
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains general information about the Segment.</dd> <dd>Contains general information about the Segment.</dd>
</dl> </dl>
<section anchor="segmentuuid-element"><name>SegmentUUID Element</name> <section anchor="segmentuuid-element"><name>SegmentUUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x73A4 / binary</dd> <dd>0x73A4 / binary</dd>
<dt>length:</dt> <dt>length:</dt>
<dd>16</dd> <dd>16</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\SegmentUUID</tt></dd> <dd><tt>\Segment\Info\SegmentUUID</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A randomly generated unique ID to identify the Segment amongst many others ( 128 bits). It is equivalent to a UUID v4 <xref target="RFC4122"></xref> with all bits randomly (or pseudo-randomly) chosen. An actual UUID v4 value, where some bits are not random, <bcp14>MAY</bcp14> also be used.</dd> <dd>A randomly generated UID that identifies the Segment amongst many others (12 8 bits). It is equivalent to a Universally Unique Identifier (UUID) v4 <xref tar get="RFC4122"></xref> with all bits randomly (or pseudorandomly) chosen. An act ual UUID v4 value, where some bits are not random, <bcp14>MAY</bcp14> also be us ed.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the Segment is a part of a Linked Segment, then this Element is <bcp14>RE QUIRED</bcp14>. <dd>If the Segment is a part of a Linked Segment, then this Element is <bcp14>RE QUIRED</bcp14>.
The value of the unique ID <bcp14>MUST</bcp14> contain at least one bit set to 1 .</dd> The value of the UID <bcp14>MUST</bcp14> contain at least one bit set to 1.</dd>
</dl> </dl>
</section> </section>
<section anchor="segmentfilename-element"><name>SegmentFilename Element</name> <section anchor="segmentfilename-element"><name>SegmentFilename Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x7384 / utf-8</dd> <dd>0x7384 / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\SegmentFilename</tt></dd> <dd><tt>\Segment\Info\SegmentFilename</tt></dd>
skipping to change at line 651 skipping to change at line 776
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x3CB923 / binary</dd> <dd>0x3CB923 / binary</dd>
<dt>length:</dt> <dt>length:</dt>
<dd>16</dd> <dd>16</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\PrevUUID</tt></dd> <dd><tt>\Segment\Info\PrevUUID</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>An ID to identify the previous Segment of a Linked Segment.</dd> <dd>An ID that identifies the previous Segment of a Linked Segment.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the Segment is a part of a Linked Segment that uses Hard Linking (<xref t arget="hard-linking"></xref>), <dd>If the Segment is a part of a Linked Segment that uses Hard Linking (<xref t arget="hard-linking"></xref>),
then either the PrevUUID or the NextUUID Element is <bcp14>REQUIRED</bcp14>. If a Segment contains a PrevUUID but not a NextUUID, then either the PrevUUID or the NextUUID Element is <bcp14>REQUIRED</bcp14>. If a Segment contains a PrevUUID but not a NextUUID,
then it <bcp14>MAY</bcp14> be considered as the last Segment of the Linked Segme nt. The PrevUUID <bcp14>MUST NOT</bcp14> be equal to the SegmentUUID.</dd> then it <bcp14>MAY</bcp14> be considered as the last Segment of the Linked Segme nt. The PrevUUID <bcp14>MUST NOT</bcp14> be equal to the SegmentUUID.</dd>
</dl> </dl>
</section> </section>
<section anchor="prevfilename-element"><name>PrevFilename Element</name> <section anchor="prevfilename-element"><name>PrevFilename Element</name>
<dl spacing="compact"> <dl spacing="compact">
skipping to change at line 688 skipping to change at line 813
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x3EB923 / binary</dd> <dd>0x3EB923 / binary</dd>
<dt>length:</dt> <dt>length:</dt>
<dd>16</dd> <dd>16</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\NextUUID</tt></dd> <dd><tt>\Segment\Info\NextUUID</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>An ID to identify the next Segment of a Linked Segment.</dd> <dd>An ID that identifies the next Segment of a Linked Segment.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the Segment is a part of a Linked Segment that uses Hard Linking (<xref t arget="hard-linking"></xref>), <dd>If the Segment is a part of a Linked Segment that uses Hard Linking (<xref t arget="hard-linking"></xref>),
then either the PrevUUID or the NextUUID Element is <bcp14>REQUIRED</bcp14>. If a Segment contains a NextUUID but not a PrevUUID, then either the PrevUUID or the NextUUID Element is <bcp14>REQUIRED</bcp14>. If a Segment contains a NextUUID but not a PrevUUID,
then it <bcp14>MAY</bcp14> be considered as the first Segment of the Linked Segm ent. The NextUUID <bcp14>MUST NOT</bcp14> be equal to the SegmentUUID.</dd> then it <bcp14>MAY</bcp14> be considered as the first Segment of the Linked Segm ent. The NextUUID <bcp14>MUST NOT</bcp14> be equal to the SegmentUUID.</dd>
</dl> </dl>
</section> </section>
<section anchor="nextfilename-element"><name>NextFilename Element</name> <section anchor="nextfilename-element"><name>NextFilename Element</name>
<dl spacing="compact"> <dl spacing="compact">
skipping to change at line 723 skipping to change at line 848
<section anchor="segmentfamily-element"><name>SegmentFamily Element</name> <section anchor="segmentfamily-element"><name>SegmentFamily Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x4444 / binary</dd> <dd>0x4444 / binary</dd>
<dt>length:</dt> <dt>length:</dt>
<dd>16</dd> <dd>16</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\SegmentFamily</tt></dd> <dd><tt>\Segment\Info\SegmentFamily</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID that all Segments of a Linked Segment <bcp14>MUST</bcp14> share (128 bits). It is equivalent to a UUID v4 <xref target="RFC4122"></xref> with al l bits randomly (or pseudo-randomly) chosen. An actual UUID v4 value, where some bits are not random, <bcp14>MAY</bcp14> also be used.</dd> <dd>A UID that all Segments of a Linked Segment <bcp14>MUST</bcp14> share (128 b its). It is equivalent to a UUID v4 <xref target="RFC4122"></xref> with all bits randomly (or pseudorandomly) chosen. An actual UUID v4 value, where some bits a re not random, <bcp14>MAY</bcp14> also be used.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the Segment Info contains a <tt>ChapterTranslate</tt> element, this Eleme nt is <bcp14>REQUIRED</bcp14>.</dd> <dd>If the Segment Info contains a <tt>ChapterTranslate</tt> element, this Eleme nt is <bcp14>REQUIRED</bcp14>.</dd>
</dl> </dl>
</section> </section>
<section anchor="chaptertranslate-element"><name>ChapterTranslate Element</name> <section anchor="chaptertranslate-element"><name>ChapterTranslate Element</name>
<!-- [rfced] Does "they" refer to "Chapter Codec" in these sentences? If so,
we will updated "Chapter Codec" to "Chapter Codecs".
Original:
rationale: Chapter Codec may need to address different segments, but
they may not know of the way to identify such segment when stored
in Matroska.
rationale: Chapter Codec may need to address content in specific
track, but they may not know of the way to identify tracks in
Matroska.
Perhaps:
rationale: Chapter Codecs may need to address different segments, but
they may not know of the way to identify such segments when stored
in Matroska.
rationale: Chapter Codecs may need to address content in specific
track, but they may not know of the way to identify tracks in
Matroska.
-->
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6924 / master</dd> <dd>0x6924 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\ChapterTranslate</tt></dd> <dd><tt>\Segment\Info\ChapterTranslate</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The mapping between this <tt>Segment</tt> and a segment value in the given C <dd>The mapping between this <tt>Segment</tt> and a
hapter Codec.</dd> segment value in the given Chapter Codec.</dd>
<dt>rationale:</dt> <dt>rationale:</dt>
<dd>Chapter Codec may need to address different segments, but they may not know of the way to identify such segment when stored in Matroska. <dd>Chapter Codec may need to address different segments, but they may not know of the way to identify such segments when stored in Matroska.
This element and its child elements add a way to map the internal segments known to the Chapter Codec to the Segment IDs in Matroska. This element and its child elements add a way to map the internal segments known to the Chapter Codec to the Segment IDs in Matroska.
This allows remuxing a file with Chapter Codec without changing the content of t he codec data, just the Segment mapping.</dd> This allows remuxing a file with the Chapter Codec without changing the content of the codec data, just the Segment mapping.</dd>
</dl> </dl>
<section anchor="chaptertranslateid-element"><name>ChapterTranslateID Element</n ame> <section anchor="chaptertranslateid-element"><name>ChapterTranslateID Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x69A5 / binary</dd> <dd>0x69A5 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\ChapterTranslate\ChapterTranslateID</tt></dd> <dd><tt>\Segment\Info\ChapterTranslate\ChapterTranslateID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
skipping to change at line 770 skipping to change at line 918
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x69BF / uinteger</dd> <dd>0x69BF / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\ChapterTranslate\ChapterTranslateCodec</tt></dd> <dd><tt>\Segment\Info\ChapterTranslate\ChapterTranslateCodec</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>This <tt>ChapterTranslate</tt> applies to this chapter codec of the given ch apter edition(s); see <xref target="chapprocesscodecid-element"></xref>.</dd> <dd>This <tt>ChapterTranslate</tt> applies to this chapter codec of the given ch apter edition(s); see <xref target="chapprocesscodecid-element"></xref>.</dd>
<dt>defined values:</dt>
<dd>See <xref target="ChapterTranslateCodecValues"/>.</dd>
</dl> </dl>
<t>defined values:</t> <table anchor="ChapterTranslateCodecValues"><name>ChapterTranslateCodec Values</
<table anchor="ChapterTranslateCodecValues"><name>ChapterTranslateCodec values</ name>
name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 794 skipping to change at line 944
<td align="left">Matroska Script</td> <td align="left">Matroska Script</td>
<td align="left">Chapter commands using the Matroska Script codec.</td> <td align="left">Chapter commands using the Matroska Script codec.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">DVD-menu</td> <td align="left">DVD-menu</td>
<td align="left">Chapter commands using the DVD-like codec.</td> <td align="left">Chapter commands using the DVD-like codec.</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="chaptertranslateeditionuid-element"><name>ChapterTranslateEditi onUID Element</name> <section anchor="chaptertranslateeditionuid-element"><name>ChapterTranslateEditi onUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x69FC / uinteger</dd> <dd>0x69FC / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\ChapterTranslate\ChapterTranslateEditionUID</tt></dd> <dd><tt>\Segment\Info\ChapterTranslate\ChapterTranslateEditionUID</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specify a chapter edition UID on which this <tt>ChapterTranslate</tt> applie s.</dd> <dd>Specify a chapter edition UID to which this <tt>ChapterTranslate</tt> applie s.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>When no <tt>ChapterTranslateEditionUID</tt> is specified in the <tt>ChapterT ranslate</tt>, the <tt>ChapterTranslate</tt> applies to all chapter editions fou nd in the Segment using the given <tt>ChapterTranslateCodec</tt>.</dd> <dd>When no <tt>ChapterTranslateEditionUID</tt> is specified in the <tt>ChapterT ranslate</tt>, the <tt>ChapterTranslate</tt> applies to all chapter editions fou nd in the Segment using the given <tt>ChapterTranslateCodec</tt>.</dd>
</dl> </dl>
</section> </section>
</section> </section>
<section anchor="timestampscale-element"><name>TimestampScale Element</name> <section anchor="timestampscale-element"><name>TimestampScale Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
skipping to change at line 839 skipping to change at line 990
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x4489 / float</dd> <dd>0x4489 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt; 0x0p+0</dd> <dd>&gt; 0x0p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\Duration</tt></dd> <dd><tt>\Segment\Info\Duration</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Duration of the Segment, expressed in Segment Ticks which is based on Timest ampScale; see <xref target="timestamp-ticks"></xref>.</dd> <dd>Duration of the Segment, expressed in Segment Ticks, which are based on Time stampScale; see <xref target="timestamp-ticks"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="dateutc-element"><name>DateUTC Element</name> <section anchor="dateutc-element"><name>DateUTC Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x4461 / date</dd> <dd>0x4461 / date</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\DateUTC</tt></dd> <dd><tt>\Segment\Info\DateUTC</tt></dd>
skipping to change at line 873 skipping to change at line 1024
<dd><tt>\Segment\Info\Title</tt></dd> <dd><tt>\Segment\Info\Title</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>General name of the Segment.</dd> <dd>General name of the Segment.</dd>
</dl> </dl>
</section> </section>
<section anchor="muxingapp-element"><name>MuxingApp Element</name> <section anchor="muxingapp-element"><name>MuxingApp Element</name>
<!-- [rfced] Will readers know what "libmatroska" is? Would a citation be
helpful or is the current okay?
Original:
definition: Muxing application or library (example: "libmatroska-
0.4.3").
...
definition: Bogus StereoMode value used in old versions of
libmatroska.
...
usage notes: This Element MUST NOT be used. It was an incorrect
value used in libmatroska up to 0.9.0.
...
There was also a bug in libmatroska
prior to 0.9.0 that would save/read it as 0x53B9 instead of 0x53B8;
see OldStereoMode (Section 5.1.4.1.28.5).
-->
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x4D80 / utf-8</dd> <dd>0x4D80 / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\MuxingApp</tt></dd> <dd><tt>\Segment\Info\MuxingApp</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Muxing application or library (example: &quot;libmatroska-0.4.3&quot;).</dd> <dd>Muxing application or library (example: "libmatroska-0.4.3").</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>Include the full name of the application or library followed by the version number.</dd> <dd>Include the full name of the application or library followed by the version number.</dd>
</dl> </dl>
</section> </section>
<section anchor="writingapp-element"><name>WritingApp Element</name> <section anchor="writingapp-element"><name>WritingApp Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x5741 / utf-8</dd> <dd>0x5741 / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Info\WritingApp</tt></dd> <dd><tt>\Segment\Info\WritingApp</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Writing application (example: &quot;mkvmerge-0.3.3&quot;).</dd> <dd>Writing application (example: "mkvmerge-0.3.3").</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>Include the full name of the application followed by the version number.</dd > <dd>Include the full name of the application followed by the version number.</dd >
</dl> </dl>
</section> </section>
</section> </section>
<section anchor="cluster-element"><name>Cluster Element</name> <section anchor="cluster-element"><name>Cluster Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x1F43B675 / master</dd> <dd>0x1F43B675 / master</dd>
</dl> <dt>unknownsizeallowed:</dt>
<t>unknownsizeallowed: True</t> <dd>True</dd>
<dl spacing="compact">
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster</tt></dd> <dd><tt>\Segment\Cluster</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The Top-Level Element containing the (monolithic) Block structure.</dd> <dd>The Top-Level Element containing the (monolithic) Block structure.</dd>
</dl> </dl>
<section anchor="timestamp-element"><name>Timestamp Element</name> <section anchor="timestamp-element"><name>Timestamp Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE7 / uinteger</dd> <dd>0xE7 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\Timestamp</tt></dd> <dd><tt>\Segment\Cluster\Timestamp</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Absolute timestamp of the cluster, expressed in Segment Ticks which is based on TimestampScale; see <xref target="timestamp-ticks"></xref>.</dd> <dd>Absolute timestamp of the cluster, expressed in Segment Ticks, which are bas ed on TimestampScale; see <xref target="timestamp-ticks"></xref>.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>This element <bcp14>SHOULD</bcp14> be the first child element of the Cluster <dd>This element <bcp14>SHOULD</bcp14> be the first child element of the Cluster
it belongs to, it belongs to or the second if that Cluster contains a CRC-32 element (<xref ta
or the second if that Cluster contains a CRC-32 element (<xref target="crc-32">< rget="crc-32"></xref>).</dd>
/xref>).</dd>
</dl> </dl>
</section> </section>
<section anchor="position-element"><name>Position Element</name> <section anchor="position-element"><name>Position Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xA7 / uinteger</dd> <dd>0xA7 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\Position</tt></dd> <dd><tt>\Segment\Cluster\Position</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>maxver:</dt> <dt>maxver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The Segment Position of the Cluster in the Segment (0 in live streams). <dd>The Segment Position of the Cluster in the Segment (0 in live streams).
It might help to resynchronise offset on damaged streams.</dd> It might help to resynchronize the offset on damaged streams.</dd>
</dl> </dl>
</section> </section>
<section anchor="prevsize-element"><name>PrevSize Element</name> <section anchor="prevsize-element"><name>PrevSize Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xAB / uinteger</dd> <dd>0xAB / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\PrevSize</tt></dd> <dd><tt>\Segment\Cluster\PrevSize</tt></dd>
skipping to change at line 977 skipping to change at line 1143
<section anchor="simpleblock-element"><name>SimpleBlock Element</name> <section anchor="simpleblock-element"><name>SimpleBlock Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xA3 / binary</dd> <dd>0xA3 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\SimpleBlock</tt></dd> <dd><tt>\Segment\Cluster\SimpleBlock</tt></dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>2</dd> <dd>2</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Similar to Block, see <xref target="block-structure"></xref>, but without al
l the extra information, <dd>Similar to Block (see <xref target="block-structure"></xref>) but without al
mostly used to reduced overhead when no extra feature is needed; see <xref targe l the extra information.
t="simpleblock-structure"></xref> on SimpleBlock Structure.</dd> Mostly used to reduce overhead when no extra feature is needed; see <xref target
="simpleblock-structure"></xref> on SimpleBlock Structure.</dd>
</dl> </dl>
</section> </section>
<section anchor="blockgroup-element"><name>BlockGroup Element</name> <section anchor="blockgroup-element"><name>BlockGroup Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xA0 / master</dd> <dd>0xA0 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup</tt></dd>
skipping to change at line 1018 skipping to change at line 1185
<section anchor="blockadditions-element"><name>BlockAdditions Element</name> <section anchor="blockadditions-element"><name>BlockAdditions Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x75A1 / master</dd> <dd>0x75A1 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contain additional binary data to complete the main one; see Codec BlockAddi <!-- [rfced] Will readers understand "the main one" here?
tions section of <xref target="MatroskaCodec"></xref> for more information.
Original:
definition: Contain additional binary data to complete the main one;
see Codec BlockAdditions section of [MatroskaCodec] for more
information.
Perhaps:
definition: Contain additional binary data to complete the Block element;
see Section 4.1.5 of [MatroskaCodec] for more
information.
-->
<dd>Contains additional binary data to complete the main one; see <xref
target="I-D.ietf-cellar-codec" sectionFormat="of" section="4.1.5" ></xref> for m
ore information.
An EBML parser that has no knowledge of the Block structure could still see and use/skip these data.</dd> An EBML parser that has no knowledge of the Block structure could still see and use/skip these data.</dd>
</dl> </dl>
<section anchor="blockmore-element"><name>BlockMore Element</name> <section anchor="blockmore-element"><name>BlockMore Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xA6 / master</dd> <dd>0xA6 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions\BlockMore</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions\BlockMore</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contain the BlockAdditional and some parameters.</dd> <dd>Contains the BlockAdditional and some parameters.</dd>
</dl> </dl>
</section> </section>
<section anchor="blockadditional-element"><name>BlockAdditional Element</name> <section anchor="blockadditional-element"><name>BlockAdditional Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xA5 / binary</dd> <dd>0xA5 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions\BlockMore\BlockAdditional</tt ></dd> <dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions\BlockMore\BlockAdditional</tt ></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Interpreted by the codec as it wishes (using the BlockAddID).</dd> <dd>Interpreted by the codec as it wishes (using the BlockAddID).</dd>
</dl> </dl>
</section> </section>
<section anchor="blockaddid-element"><name>BlockAddID Element</name> <section anchor="blockaddid-element"><name>BlockAddID Element</name>
<!-- [rfced] Section 5.1.3.5.2.3 ("BlockAddID Element") has two "usage
notes". Would you like to combine these or leave as is?
Original:
usage notes: Each BlockAddID value MUST be unique between all
BlockMore elements found in a BlockAdditions.
usage notes: To keep MaxBlockAdditionID as low as possible, small
values SHOULD be used.
Perhaps:
usage notes: Each BlockAddID value MUST be unique between all
BlockMore elements found in a BlockAdditions. To keep MaxBlockAdditionID
as low as possible, small values SHOULD be used.
-->
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0xEE / uinteger / 1</dd> <dd>0xEE / uinteger / 1</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions\BlockMore\BlockAddID</tt></dd > <dd><tt>\Segment\Cluster\BlockGroup\BlockAdditions\BlockMore\BlockAddID</tt></dd >
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>An ID to identify how to interpret the BlockAdditional data; see Codec Block <dd>An ID that identifies how to interpret the BlockAdditional data; see <xref t
Additions section of <xref target="MatroskaCodec"></xref> for more information. arget="I-D.ietf-cellar-codec" sectionFormat="of" section="4.1.5" ></xref> for mo
re information.
<!-- [rfced] Please review "the meaning of the BlockAdditional data" in the
following sentences. Will this be clear?
Original:
A value of 1 indicates that the meaning of the BlockAdditional data
is defined by the codec. Any other value indicates the meaning of the
BlockAdditional data is found in the BlockAddIDType found in the TrackEntry.
Perhaps:
A value of 1 indicates that the BlockAdditional data is defined by
the codec. Any other value indicates that the BlockAdditional data should be han
dled according
to the BlockAddIDType that is located in the TrackEntry.
-->
A value of 1 indicates that the meaning of the BlockAdditional data is defined b y the codec. A value of 1 indicates that the meaning of the BlockAdditional data is defined b y the codec.
Any other value indicates the meaning of the BlockAdditional data is found in th e BlockAddIDType found in the TrackEntry.</dd> Any other value indicates the meaning of the BlockAdditional data is found in th e BlockAddIDType found in the TrackEntry.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>Each BlockAddID value <bcp14>MUST</bcp14> be unique between all BlockMore el ements found in a BlockAdditions.</dd> <dd>Each BlockAddID value <bcp14>MUST</bcp14> be unique between all BlockMore el ements found in a BlockAdditions.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>To keep MaxBlockAdditionID as low as possible, small values <bcp14>SHOULD</b cp14> be used.</dd> <dd>To keep MaxBlockAdditionID as low as possible, small values <bcp14>SHOULD</b cp14> be used.</dd>
</dl> </dl>
</section> </section>
</section> </section>
<section anchor="blockduration-element"><name>BlockDuration Element</name> <section anchor="blockduration-element"><name>BlockDuration Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x9B / uinteger</dd> <dd>0x9B / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\BlockDuration</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\BlockDuration</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<!-- [rfced] For elements containing "see implementation notes", would it be
helpful to direct the reader to the corresponding table? Or is the
current okay? Here is one example:
Original (BlockDuration Element):
minOccurs / maxOccurs: see implementation notes / 1
Perhaps (BlockDuration Element):
minOccurs / maxOccurs: see Table 2 / 1 -->
<dd>see implementation notes / 1</dd> <dd>see implementation notes / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The duration of the Block, expressed in Track Ticks; see <xref target="times tamp-ticks"></xref>. <dd>The duration of the Block, expressed in Track Ticks; see <xref target="times tamp-ticks"></xref>.
The BlockDuration Element can be useful at the end of a Track to define the dura tion of the last frame (as there is no subsequent Block available), The BlockDuration Element can be useful at the end of a Track to define the dura tion of the last frame (as there is no subsequent Block available)
or when there is a break in a track like for subtitle tracks.</dd> or when there is a break in a track like for subtitle tracks.</dd>
<dt>notes:</dt>
<dd>See <xref target="BlockDurationNotes"/>.</dd>
</dl> </dl>
<t>notes:</t> <table anchor="BlockDurationNotes"><name>BlockDuration Implementation Notes</nam
<table anchor="BlockDurationNotes"><name>BlockDuration implementation notes</nam e>
e>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">minOccurs</td> <td align="left">minOccurs</td>
<td align="left">BlockDuration <bcp14>MUST</bcp14> be set (minOccurs=1) if the a ssociated TrackEntry stores a DefaultDuration value.</td> <td align="left">BlockDuration <bcp14>MUST</bcp14> be set (minOccurs=1) if the a ssociated TrackEntry stores a DefaultDuration value.</td>
</tr> </tr>
<tr> <tr>
<td align="left">default</td> <td align="left">default</td>
<td align="left">When not written and with no DefaultDuration, the value is assu
med to be the difference between the timestamp of this Block and the timestamp o <!-- [rfced] How may we clarity "When not written and with no DefaultDuration"?
f the next Block in &quot;display&quot; order (not coding order).</td>
Original:
When not written and with no DefaultDuration, the value is assumed to be the
difference between the timestamp of this Block and the timestamp of the next Blo
ck in "display"
order (not coding order).
Perhaps:
If a value is not specified and no DefaultDuration is present, the value is assu
med to be the
difference between the timestamp of this Block and the timestamp of the next Blo
ck in "display"
order (not coding order).
-->
<td align="left">When not written and with no DefaultDuration, the value is assu
med to be the difference between the timestamp of this Block and the timestamp o
f the next Block in "display" order (not coding order).</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="referencepriority-element"><name>ReferencePriority Element</nam e> <section anchor="referencepriority-element"><name>ReferencePriority Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0xFA / uinteger / 0</dd> <dd>0xFA / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\ReferencePriority</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\ReferencePriority</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>This frame is referenced and has the specified cache priority. <dd>This frame is referenced and has the specified cache priority.
In cache only a frame of the same or higher priority can replace this frame. A v alue of 0 means the frame is not referenced.</dd> In the cache, only a frame of the same or higher priority can replace this frame . A value of 0 means the frame is not referenced.</dd>
</dl> </dl>
</section> </section>
<section anchor="referenceblock-element"><name>ReferenceBlock Element</name> <section anchor="referenceblock-element"><name>ReferenceBlock Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xFB / integer</dd> <dd>0xFB / integer</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\ReferenceBlock</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\ReferenceBlock</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A timestamp value, relative to the timestamp of the Block in this BlockGroup , expressed in Track Ticks; see <xref target="timestamp-ticks"></xref>. <dd>A timestamp value, relative to the timestamp of the Block in this BlockGroup , expressed in Track Ticks; see <xref target="timestamp-ticks"></xref>.
This is used to reference other frames necessary to decode this frame. This is used to reference other frames necessary to decode this frame.
The relative value <bcp14>SHOULD</bcp14> correspond to a valid <tt>Block</tt> th The relative value <bcp14>SHOULD</bcp14> correspond to a valid <tt>Block</tt> th
is <tt>Block</tt> depends on. at this <tt>Block</tt> depends on.
Historically Matroska Writer didn't write the actual <tt>Block(s)</tt> this <tt> Historically, Matroska Writers didn't write the actual <tt>Block(s)</tt> that th
Block</tt> depends on, but <em>some</em> <tt>Block</tt> in the past.</dd> is <tt>Block</tt> depends on, but they did write <em>some</em> <tt>Block(s)</tt>
in the past.</dd>
</dl> </dl>
<t>The value &quot;0&quot; <bcp14>MAY</bcp14> also be used to signify this <tt>B
lock</tt> cannot be decoded on its own, but without knownledge of which <tt>Bloc <!-- [rfced] How may we rephrase the part of this sentence starting with "but
k</tt> is necessary. In this case, other <tt>ReferenceBlock</tt> <bcp14>MUST NOT without..." for clarity?
</bcp14> be found in the same <tt>BlockGroup</tt>.</t>
<t>If the <tt>BlockGroup</tt> doesn't have any <tt>ReferenceBlock</tt> element, Original:
then the <tt>Block</tt> it contains can be decoded without using any other <tt>B The value "0" MAY also be used to signify this Block cannot be
lock</tt> data.</t> decoded on its own, but without knownledge of which Block is necessary.
Perhaps:
The value "0" MAY also be used to signify that this Block cannot be
decoded on its own but the necessary Block is unknown.
-->
<t>The value "0" <bcp14>MAY</bcp14> also be used to signify that this <tt>Block<
/tt> cannot be decoded on its own, but without knowledge of which <tt>Block</tt>
is necessary. In this case, other <tt>ReferenceBlock</tt> Elements <bcp14>MUST
NOT</bcp14> be found in the same <tt>BlockGroup</tt>.</t>
<t>If the <tt>BlockGroup</tt> doesn't have a <tt>ReferenceBlock</tt> element, th
en the <tt>Block</tt> it contains can be decoded without using any other <tt>Blo
ck</tt> data.</t>
</section> </section>
<section anchor="codecstate-element"><name>CodecState Element</name> <section anchor="codecstate-element"><name>CodecState Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xA4 / binary</dd> <dd>0xA4 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\CodecState</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\CodecState</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
skipping to change at line 1171 skipping to change at line 1417
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x75A2 / integer</dd> <dd>0x75A2 / integer</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\DiscardPadding</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\DiscardPadding</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Duration of the silent data added to the Block, expressed in Matroska Ticks -- i.e., in nanoseconds; see <xref target="timestamp-ticks"></xref> <dd>Duration of the silent data added to the Block, expressed in Matroska Ticks -- i.e., in nanoseconds; see <xref target="timestamp-ticks"></xref>
(padding at the end of the Block for positive value, at the beginning of the Blo ck for negative value). (padding at the end of the Block for positive values and at the beginning of the Block for negative values).
The duration of DiscardPadding is not calculated in the duration of the TrackEnt ry and <bcp14>SHOULD</bcp14> be discarded during playback.</dd> The duration of DiscardPadding is not calculated in the duration of the TrackEnt ry and <bcp14>SHOULD</bcp14> be discarded during playback.</dd>
</dl> </dl>
</section> </section>
</section> </section>
</section> </section>
<section anchor="tracks-element"><name>Tracks Element</name> <section anchor="tracks-element"><name>Tracks Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x1654AE6B / master</dd> <dd>0x1654AE6B / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks</tt></dd> <dd><tt>\Segment\Tracks</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
</dl> <dt>recurring:</dt><dd>True</dd>
<t>recurring: True</t>
<dl spacing="compact">
<dt>definition:</dt> <dt>definition:</dt>
<dd>A Top-Level Element of information with many tracks described.</dd> <dd>A Top-Level Element of information with many tracks described.</dd>
</dl> </dl>
<section anchor="trackentry-element"><name>TrackEntry Element</name> <section anchor="trackentry-element"><name>TrackEntry Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xAE / master</dd> <dd>0xAE / master</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 1225 skipping to change at line 1468
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackNumber</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackNumber</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The track number as used in the Block Header.</dd> <dd>The track number as used in the Block Header.</dd>
</dl> </dl>
</section> </section>
<section anchor="trackuid-element"><name>TrackUID Element</name> <section anchor="trackuid-element"><name>TrackUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x73C5 / uinteger</dd> <dd>0x73C5 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackUID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackUID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID to identify the Track.</dd> <dd>A UID that identifies the Track.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="tracktype-element"><name>TrackType Element</name> <section anchor="tracktype-element"><name>TrackType Element</name>
<!-- [rfced] May we rephrase the following in Table 3 (last column)?
Original:
A mix of different other TrackType.
Perhaps:
A mix of other TrackType Elements.
-->
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x83 / uinteger</dd> <dd>0x83 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackType</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackType</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The <tt>TrackType</tt> defines the type of each frame found in the Track. <dd>The <tt>TrackType</tt> defines the type of each frame found in the Track.
The value <bcp14>SHOULD</bcp14> be stored on 1 octet.</dd> The value <bcp14>SHOULD</bcp14> be stored on 1 octet.</dd>
<dt>defined values:</dt>
<dd>See <xref target="TrackTypeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t> <table anchor="TrackTypeValues"><name>TrackType Values</name>
<table anchor="TrackTypeValues"><name>TrackType values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">each frame contains</th> <th align="left">contents of each frame</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">video</td> <td align="left">video</td>
<td align="left">An image.</td> <td align="left">An image.</td>
</tr> </tr>
skipping to change at line 1313 skipping to change at line 1567
<td align="left">control</td> <td align="left">control</td>
<td align="left">Metadata used to control the player of the <tt>Matroska Player< /tt>.</td> <td align="left">Metadata used to control the player of the <tt>Matroska Player< /tt>.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>33</tt></td> <td align="left"><tt>33</tt></td>
<td align="left">metadata</td> <td align="left">metadata</td>
<td align="left">Timed metadata that can be passed on to the <tt>Matroska Player </tt>.</td> <td align="left">Timed metadata that can be passed on to the <tt>Matroska Player </tt>.</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="flagenabled-element"><name>FlagEnabled Element</name> <section anchor="flagenabled-element"><name>FlagEnabled Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0xB9 / uinteger / 1</dd> <dd>0xB9 / uinteger / 1</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagEnabled</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagEnabled</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>2</dd> <dd>2</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if the track is usable. It is possible to turn a not usable track i nto a usable track using chapter codecs or control tracks.</dd> <dd>Set to 1 if the track is usable. It is possible to turn a track that is not usable into a usable track using chapter codecs or control tracks.</dd>
</dl> </dl>
</section> </section>
<section anchor="flagdefault-element"><name>FlagDefault Element</name> <section anchor="flagdefault-element"><name>FlagDefault Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x88 / uinteger / 1</dd> <dd>0x88 / uinteger / 1</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagDefault</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagDefault</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set if that track (audio, video or subs) is eligible for automatic selection
by the player; see <xref target="default-track-selection"></xref> for more deta <!-- [rfced] Should "subs" here be updated to "subtitle"?
ils.</dd>
Original:
definition: Set if that track (audio, video or subs) is eligible for
automatic selection by the player; see Section 19 for more
details.
-->
<!-- [rfced] For the definitions of "FlagDefault Element" and "FlagForced
Element", should the following sentences be rephrased to clarify the
values that should be set? We note that surrounding elements use the
phrase "Set to 1..." consistently.
Original:
Set if that track (audio, video or subs) is eligible for automatic
selection by the player; see Section 19 for more details.
...
Set if that
track is eligible for automatic selection by the player if it matches the
user's language preference...
Perhaps:
Set to 1 if the track (audio, video, or subs) is eligible for
automatic selection by the player; see Section 19 for more details.
...
Set to 1 if the track is eligible for automatic selection by the player if it
matches the user's language preference...
-->
<dd>Set if the track (audio, video, or subs) is eligible for automatic selection
by the player; see <xref target="default-track-selection"></xref> for more deta
ils.</dd>
</dl> </dl>
</section> </section>
<section anchor="flagforced-element"><name>FlagForced Element</name> <section anchor="flagforced-element"><name>FlagForced Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55AA / uinteger / 0</dd> <dd>0x55AA / uinteger / 0</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagForced</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagForced</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Applies only to subtitles. Set if that track is eligible for automatic selec <dd>Applies only to subtitles. Set if the track is eligible for automatic select
tion by the player if it matches the user's language preference, ion by the player if it matches the user's language preference,
even if the user's preferences would normally not enable subtitles with the sele even if the user's preferences would not normally enable subtitles with the sele
cted audio track; cted audio track;
this can be used for tracks containing only translations of foreign-language aud this can be used for tracks containing only translations of audio in foreign lan
io or onscreen text. guages or on-screen text.
See <xref target="default-track-selection"></xref> for more details.</dd> See <xref target="default-track-selection"></xref> for more details.</dd>
</dl> </dl>
</section> </section>
<section anchor="flaghearingimpaired-element"><name>FlagHearingImpaired Element< /name> <section anchor="flaghearingimpaired-element"><name>FlagHearingImpaired Element< /name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55AB / uinteger</dd> <dd>0x55AB / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagHearingImpaired</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagHearingImpaired</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if and only if that track is suitable for users with hearing impair ments.</dd> <dd>Set to 1 if and only if the track is suitable for users with hearing impairm ents.</dd>
</dl> </dl>
</section> </section>
<section anchor="flagvisualimpaired-element"><name>FlagVisualImpaired Element</n ame> <section anchor="flagvisualimpaired-element"><name>FlagVisualImpaired Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55AC / uinteger</dd> <dd>0x55AC / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagVisualImpaired</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagVisualImpaired</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if and only if that track is suitable for users with visual impairm ents.</dd> <dd>Set to 1 if and only if the track is suitable for users with visual impairme nts.</dd>
</dl> </dl>
</section> </section>
<section anchor="flagtextdescriptions-element"><name>FlagTextDescriptions Elemen t</name> <section anchor="flagtextdescriptions-element"><name>FlagTextDescriptions Elemen t</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55AD / uinteger</dd> <dd>0x55AD / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagTextDescriptions</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagTextDescriptions</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if and only if that track contains textual descriptions of video co ntent.</dd> <dd>Set to 1 if and only if the track contains textual descriptions of video con tent.</dd>
</dl> </dl>
</section> </section>
<section anchor="flagoriginal-element"><name>FlagOriginal Element</name> <section anchor="flagoriginal-element"><name>FlagOriginal Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55AE / uinteger</dd> <dd>0x55AE / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagOriginal</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagOriginal</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if and only if that track is in the content's original language.</d d> <dd>Set to 1 if and only if the track is in the content's original language.</dd >
</dl> </dl>
</section> </section>
<section anchor="flagcommentary-element"><name>FlagCommentary Element</name> <section anchor="flagcommentary-element"><name>FlagCommentary Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55AF / uinteger</dd> <dd>0x55AF / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagCommentary</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagCommentary</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if and only if that track contains commentary.</dd> <dd>Set to 1 if and only if the track contains commentary.</dd>
</dl> </dl>
</section> </section>
<section anchor="flaglacing-element"><name>FlagLacing Element</name> <section anchor="flaglacing-element"><name>FlagLacing Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x9C / uinteger / 1</dd> <dd>0x9C / uinteger / 1</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\FlagLacing</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\FlagLacing</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if the track <bcp14>MAY</bcp14> contain blocks using lacing. When s <dd>Set to 1 if the track <bcp14>MAY</bcp14> contain blocks that use lacing.
et to 0 all blocks <bcp14>MUST</bcp14> have their lacing flags set to No lacing; When set to 0, all blocks <bcp14>MUST</bcp14> have their lacing flags set to "no
see <xref target="block-lacing"></xref> on Block Lacing.</dd> lacing"; see <xref target="block-lacing"></xref> on Block Lacing.</dd>
</dl> </dl>
</section> </section>
<section anchor="defaultduration-element"><name>DefaultDuration Element</name> <section anchor="defaultduration-element"><name>DefaultDuration Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x23E383 / uinteger</dd> <dd>0x23E383 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\DefaultDuration</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\DefaultDuration</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Number of nanoseconds per frame, expressed in Matroska Ticks -- i.e., in nan oseconds; see <xref target="timestamp-ticks"></xref> <dd>Number of nanoseconds per frame, expressed in Matroska Ticks -- i.e., in nan oseconds; see <xref target="timestamp-ticks"></xref>
(frame in the Matroska sense -- one Element put into a (Simple)Block).</dd> ("frame" in the Matroska sense -- one Element put into a (Simple)Block).</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="defaultdecodedfieldduration-element"><name>DefaultDecodedFieldD uration Element</name> <section anchor="defaultdecodedfieldduration-element"><name>DefaultDecodedFieldD uration Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x234E7A / uinteger</dd> <dd>0x234E7A / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\DefaultDecodedFieldDuration</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\DefaultDecodedFieldDuration</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The period between two successive fields at the output of the decoding proce ss, expressed in Matroska Ticks -- i.e., in nanoseconds; see <xref target="times tamp-ticks"></xref>. <dd>The period between two successive fields at the output of the decoding proce ss, expressed in Matroska Ticks -- i.e., in nanoseconds; see <xref target="times tamp-ticks"></xref>.
see <xref target="defaultdecodedfieldduration"></xref> for more information</dd> See <xref target="defaultdecodedfieldduration"></xref> for more information</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="tracktimestampscale-element"><name>TrackTimestampScale Element< /name> <section anchor="tracktimestampscale-element"><name>TrackTimestampScale Element< /name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x23314F / float / 0x1p+0</dd> <dd>0x23314F / float / 0x1p+0</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt; 0x0p+0</dd> <dd>&gt; 0x0p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackTimestampScale</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackTimestampScale</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>maxver:</dt> <dt>maxver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The scale to apply on this track to work at normal speed in relation with ot her tracks <dd>The scale to apply on this track to work at normal speed in relation with ot her tracks
(mostly used to adjust video speed when the audio length differs).</dd> (mostly used to adjust video speed when the audio length differs).</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="maxblockadditionid-element"><name>MaxBlockAdditionID Element</n ame> <section anchor="maxblockadditionid-element"><name>MaxBlockAdditionID Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55EE / uinteger / 0</dd> <dd>0x55EE / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\MaxBlockAdditionID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\MaxBlockAdditionID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The maximum value of BlockAddID (<xref target="blockaddid-element"></xref>). <dd>The maximum value of BlockAddID (<xref target="blockaddid-element"></xref>).
A value 0 means there is no BlockAdditions (<xref target="blockadditions-element "></xref>) for this track.</dd> A value of 0 means there is no BlockAdditions (<xref target="blockadditions-elem ent"></xref>) for this track.</dd>
</dl> </dl>
</section> </section>
<section anchor="blockadditionmapping-element"><name>BlockAdditionMapping Elemen t</name> <section anchor="blockadditionmapping-element"><name>BlockAdditionMapping Elemen t</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x41E4 / master</dd> <dd>0x41E4 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\BlockAdditionMapping</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\BlockAdditionMapping</tt></dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains elements that extend the track format, by adding content either to each frame, <dd>Contains elements that extend the track format by adding content either to e ach frame,
with BlockAddID (<xref target="blockaddid-element"></xref>), or to the track as a whole with BlockAddID (<xref target="blockaddid-element"></xref>), or to the track as a whole
with BlockAddIDExtraData.</dd> with BlockAddIDExtraData.</dd>
</dl> </dl>
<section anchor="blockaddidvalue-element"><name>BlockAddIDValue Element</name> <section anchor="blockaddidvalue-element"><name>BlockAddIDValue Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x41F0 / uinteger</dd> <dd>0x41F0 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
skipping to change at line 1577 skipping to change at line 1861
<dd>0x41F0 / uinteger</dd> <dd>0x41F0 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt;=2</dd> <dd>&gt;=2</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\BlockAdditionMapping\BlockAddIDValue</tt></dd > <dd><tt>\Segment\Tracks\TrackEntry\BlockAdditionMapping\BlockAddIDValue</tt></dd >
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>If the track format extension needs content beside frames, <dd>If the track format extension needs content beside frames,
the value refers to the BlockAddID (<xref target="blockaddid-element"></xref>), value being described.</dd> the value refers to the BlockAddID (<xref target="blockaddid-element"></xref>) v alue being described.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>To keep MaxBlockAdditionID as low as possible, small values <bcp14>SHOULD</b cp14> be used.</dd> <dd>To keep MaxBlockAdditionID as low as possible, small values <bcp14>SHOULD</b cp14> be used.</dd>
</dl> </dl>
</section> </section>
<section anchor="blockaddidname-element"><name>BlockAddIDName Element</name> <section anchor="blockaddidname-element"><name>BlockAddIDName Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x41A4 / string</dd> <dd>0x41A4 / string</dd>
skipping to change at line 1681 skipping to change at line 1966
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x22B59D / string</dd> <dd>0x22B59D / string</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\LanguageBCP47</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\LanguageBCP47</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The language of the track, <dd>The language of the track,
in the <xref target="BCP47"></xref> form; see <xref target="language-codes"></xr ef> on language codes. in the form defined in <xref target="RFC5646"></xref>; see <xref target="languag e-codes"></xref> on language codes.
If this Element is used, then any Language Elements used in the same TrackEntry <bcp14>MUST</bcp14> be ignored.</dd> If this Element is used, then any Language Elements used in the same TrackEntry <bcp14>MUST</bcp14> be ignored.</dd>
</dl> </dl>
</section> </section>
<section anchor="codecid-element"><name>CodecID Element</name> <section anchor="codecid-element"><name>CodecID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x86 / string</dd> <dd>0x86 / string</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\CodecID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\CodecID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>An ID corresponding to the codec, <dd>An ID corresponding to the codec;
see <xref target="MatroskaCodec"></xref> for more info.</dd> see <xref target="I-D.ietf-cellar-codec"></xref> for more info.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="codecprivate-element"><name>CodecPrivate Element</name> <section anchor="codecprivate-element"><name>CodecPrivate Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x63A2 / binary</dd> <dd>0x63A2 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\CodecPrivate</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\CodecPrivate</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Private data only known to the codec.</dd> <dd>Private data only known to the codec.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="codecname-element"><name>CodecName Element</name> <section anchor="codecname-element"><name>CodecName Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x258688 / utf-8</dd> <dd>0x258688 / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\CodecName</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\CodecName</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
skipping to change at line 1763 skipping to change at line 2048
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x56AA / uinteger / 0</dd> <dd>0x56AA / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\CodecDelay</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\CodecDelay</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>CodecDelay is The codec-built-in delay, expressed in Matroska Ticks -- i.e., <dd>The built-in delay for the codec, expressed in Matroska Ticks -- i.e., in na
in nanoseconds; see <xref target="timestamp-ticks"></xref>. noseconds; see <xref target="timestamp-ticks"></xref>.
It represents the amount of codec samples that will be discarded by the decoder It represents the number of codec samples that will be discarded by the decoder
during playback. during playback.
This timestamp value <bcp14>MUST</bcp14> be subtracted from each frame timestamp in order to get the timestamp that will be actually played. This timestamp value <bcp14>MUST</bcp14> be subtracted from each frame timestamp in order to get the timestamp that will be actually played.
The value <bcp14>SHOULD</bcp14> be small so the muxing of tracks with the same a ctual timestamp are in the same Cluster.</dd> The value <bcp14>SHOULD</bcp14> be small so the muxing of tracks with the same a ctual timestamp are in the same Cluster.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="seekpreroll-element"><name>SeekPreRoll Element</name> <section anchor="seekpreroll-element"><name>SeekPreRoll Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x56BB / uinteger / 0</dd> <dd>0x56BB / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\SeekPreRoll</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\SeekPreRoll</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>After a discontinuity, SeekPreRoll is the duration of the data <dd>After a discontinuity, the duration of the data
the decoder <bcp14>MUST</bcp14> decode before the decoded data is valid, express that the decoder <bcp14>MUST</bcp14> decode before the decoded data is valid, ex
ed in Matroska Ticks -- i.e., in nanoseconds; see <xref target="timestamp-ticks" pressed in Matroska Ticks -- i.e., in nanoseconds; see <xref target="timestamp-t
></xref>.</dd> icks"></xref>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="tracktranslate-element"><name>TrackTranslate Element</name> <section anchor="tracktranslate-element"><name>TrackTranslate Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6624 / master</dd> <dd>0x6624 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackTranslate</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackTranslate</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The mapping between this <tt>TrackEntry</tt> and a track value in the given Chapter Codec.</dd> <dd>The mapping between this <tt>TrackEntry</tt> and a track value in the given Chapter Codec.</dd>
<dt>rationale:</dt> <dt>rationale:</dt>
<dd>Chapter Codec may need to address content in specific track, but they may no t know of the way to identify tracks in Matroska. <dd>Chapter Codec may need to address content in a specific track, but they may not know of the way to identify tracks in Matroska.
This element and its child elements add a way to map the internal tracks known t o the Chapter Codec to the track IDs in Matroska. This element and its child elements add a way to map the internal tracks known t o the Chapter Codec to the track IDs in Matroska.
This allows remuxing a file with Chapter Codec without changing the content of t he codec data, just the track mapping.</dd> This allows remuxing a file with Chapter Codec without changing the content of t he codec data, just the track mapping.</dd>
</dl> </dl>
<section anchor="tracktranslatetrackid-element"><name>TrackTranslateTrackID Elem ent</name> <section anchor="tracktranslatetrackid-element"><name>TrackTranslateTrackID Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x66A5 / binary</dd> <dd>0x66A5 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 1821 skipping to change at line 2106
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The binary value used to represent this <tt>TrackEntry</tt> in the chapter c odec data. <dd>The binary value used to represent this <tt>TrackEntry</tt> in the chapter c odec data.
The format depends on the <tt>ChapProcessCodecID</tt> used; see <xref target="ch approcesscodecid-element"></xref>.</dd> The format depends on the <tt>ChapProcessCodecID</tt> used; see <xref target="ch approcesscodecid-element"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="tracktranslatecodec-element"><name>TrackTranslateCodec Element< /name> <section anchor="tracktranslatecodec-element"><name>TrackTranslateCodec Element< /name>
<!-- [rfced] Would updating "This TrackTranslate applies" in one of the
following ways improve readability and maintain consistency with other
definition??
Original:
definition: This TrackTranslate applies to this chapter codec of the
given chapter edition(s); see Section 5.1.7.1.4.15.
Perhaps:
definition: Applies to the chapter codec of the
given chapter edition(s); see Section 5.1.7.1.4.15.
Or:
definition: Indicates that this TrackTranslate applies to the chapter codec
of the
given chapter edition(s); see Section 5.1.7.1.4.15.
-->
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x66BF / uinteger</dd> <dd>0x66BF / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackTranslate\TrackTranslateCodec</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackTranslate\TrackTranslateCodec</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>This <tt>TrackTranslate</tt> applies to this chapter codec of the given chap <dd>This <tt>TrackTranslate</tt> applies to the chapter codec of the given chapt
ter edition(s); see <xref target="chapprocesscodecid-element"></xref>.</dd> er edition(s); see <xref target="chapprocesscodecid-element"></xref>.</dd>
<dt>defined values:</dt>
<dd>See <xref target="TrackTranslateCodecValues"/>.</dd>
</dl> </dl>
<t>defined values:</t>
<table anchor="TrackTranslateCodecValues"><name>TrackTranslateCodec values</name <table anchor="TrackTranslateCodecValues"><name>TrackTranslateCodec Values</name
> >
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 1854 skipping to change at line 2158
<td align="left">Matroska Script</td> <td align="left">Matroska Script</td>
<td align="left">Chapter commands using the Matroska Script codec.</td> <td align="left">Chapter commands using the Matroska Script codec.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">DVD-menu</td> <td align="left">DVD-menu</td>
<td align="left">Chapter commands using the DVD-like codec.</td> <td align="left">Chapter commands using the DVD-like codec.</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="tracktranslateeditionuid-element"><name>TrackTranslateEditionUI D Element</name> <section anchor="tracktranslateeditionuid-element"><name>TrackTranslateEditionUI D Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x66FC / uinteger</dd> <dd>0x66FC / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackTranslate\TrackTranslateEditionUID</tt>< /dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackTranslate\TrackTranslateEditionUID</tt>< /dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specify a chapter edition UID on which this <tt>TrackTranslate</tt> applies. </dd> <dd>Specifies a chapter edition UID to which this <tt>TrackTranslate</tt> applie s.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>When no <tt>TrackTranslateEditionUID</tt> is specified in the <tt>TrackTrans late</tt>, the <tt>TrackTranslate</tt> applies to all chapter editions found in the Segment using the given <tt>TrackTranslateCodec</tt>.</dd> <dd>When no <tt>TrackTranslateEditionUID</tt> is specified in the <tt>TrackTrans late</tt>, the <tt>TrackTranslate</tt> applies to all chapter editions found in the Segment using the given <tt>TrackTranslateCodec</tt>.</dd>
</dl> </dl>
</section> </section>
</section> </section>
<section anchor="video-element"><name>Video Element</name> <section anchor="video-element"><name>Video Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
skipping to change at line 1896 skipping to change at line 2201
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x9A / uinteger / 0</dd> <dd>0x9A / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\FlagInterlaced</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\FlagInterlaced</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>2</dd> <dd>2</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specify whether the video frames in this track are interlaced.</dd> <dd>Specifies whether the video frames in this track are interlaced.</dd>
<dt>defined values:</dt>
<dd>See <xref target="FlagInterlacedValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t>
<table anchor="FlagInterlacedValues"><name>FlagInterlaced values</name> <table anchor="FlagInterlacedValues"><name>FlagInterlaced Values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
<td align="left">undetermined</td> <td align="left">undetermined</td>
<td align="left">Unknown status.This value <bcp14>SHOULD</bcp14> be avoided.</td > <td align="left">Unknown status. This value <bcp14>SHOULD</bcp14> be avoided.</t d>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">interlaced</td> <td align="left">interlaced</td>
<td align="left">Interlaced frames.</td> <td align="left">Interlaced frames.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">progressive</td> <td align="left">progressive</td>
<td align="left">No interlacing.</td> <td align="left">No interlacing.</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="fieldorder-element"><name>FieldOrder Element</name> <section anchor="fieldorder-element"><name>FieldOrder Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x9D / uinteger / 2</dd> <dd>0x9D / uinteger / 2</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\FieldOrder</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\FieldOrder</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specify the field ordering of video frames in this track.</dd> <dd>Specifies the field ordering of video frames in this track.</dd>
<dt>defined values:</dt>
<dd>See <xref target="FieldOrderValues"/>.</dd>
<dt>usage notes:</dt>
<dd>If FlagInterlaced is not set to 1, this Element <bcp14>MUST</bcp14> be ignor
ed.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t>
<table anchor="FieldOrderValues"><name>FieldOrder values</name> <table anchor="FieldOrderValues"><name>FieldOrder Values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
<td align="left">progressive</td> <td align="left">progressive</td>
<td align="left">Interlaced frames.This value <bcp14>SHOULD</bcp14> be avoided, setting FlagInterlaced to 2 is sufficient.</td> <td align="left">Interlaced frames. This value <bcp14>SHOULD</bcp14> be avoided; setting FlagInterlaced to 2 is sufficient.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">tff</td> <td align="left">tff</td>
<td align="left">Top field displayed first. Top field stored first.</td> <td align="left">Top field displayed first. Top field stored first.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">undetermined</td> <td align="left">undetermined</td>
<td align="left">Unknown field order.This value <bcp14>SHOULD</bcp14> be avoided .</td> <td align="left">Unknown field order. This value <bcp14>SHOULD</bcp14> be avoide d.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>6</tt></td> <td align="left"><tt>6</tt></td>
<td align="left">bff</td> <td align="left">bff</td>
<td align="left">Bottom field displayed first. Bottom field stored first.</td> <td align="left">Bottom field displayed first. Bottom field stored first.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>9</tt></td> <td align="left"><tt>9</tt></td>
skipping to change at line 1992 skipping to change at line 2307
<td align="left">Top field displayed first. Fields are interleaved in storage wi th the top line of the top field stored first.</td> <td align="left">Top field displayed first. Fields are interleaved in storage wi th the top line of the top field stored first.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>14</tt></td> <td align="left"><tt>14</tt></td>
<td align="left">tff(swapped)</td> <td align="left">tff(swapped)</td>
<td align="left">Bottom field displayed first. Fields are interleaved in storage with the top line of the top field stored first.</td> <td align="left">Bottom field displayed first. Fields are interleaved in storage with the top line of the top field stored first.</td>
</tr> </tr>
</tbody> </tbody>
</table> </table>
<dl spacing="compact">
<dt>usage notes:</dt>
<dd>If FlagInterlaced is not set to 1, this Element <bcp14>MUST</bcp14> be ignor
ed.</dd>
</dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="stereomode-element"><name>StereoMode Element</name> <section anchor="stereomode-element"><name>StereoMode Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x53B8 / uinteger / 0</dd> <dd>0x53B8 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\StereoMode</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\StereoMode</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Stereo-3D video mode. There are some more details in <xref target="multi-pla <dd>Stereo-3D video mode. See <xref target="multi-planar-and-3d-videos"></xref>
nar-and-3d-videos"></xref>.</dd> for more details.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="StereoModeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t>
<table anchor="StereoModeValues"><name>StereoMode values</name> <table anchor="StereoModeValues"><name>StereoMode Values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2098 skipping to change at line 2412
<tr> <tr>
<td align="left"><tt>13</tt></td> <td align="left"><tt>13</tt></td>
<td align="left">both eyes laced in one Block (left eye is first)</td> <td align="left">both eyes laced in one Block (left eye is first)</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>14</tt></td> <td align="left"><tt>14</tt></td>
<td align="left">both eyes laced in one Block (right eye is first)</td> <td align="left">both eyes laced in one Block (right eye is first)</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="alphamode-element"><name>AlphaMode Element</name> <section anchor="alphamode-element"><name>AlphaMode Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x53C0 / uinteger / 0</dd> <dd>0x53C0 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\AlphaMode</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\AlphaMode</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<!-- [rfced] Please clarify the parenthetical in the second sentence below,
i.e., "(considered either as 0 or 1)". Also, we updated "by to" to "by"
in the first sentence. Please review.
Original:
definition: Indicate whether the BlockAdditional Element with
BlockAddID of "1" contains Alpha data as defined by to the Codec
Mapping for the CodecID. Undefined values SHOULD NOT be used, as
the behavior of known implementations is different (considered
either as 0 or 1).
Perhaps:
definition: Indicates whether the BlockAdditional Element with
BlockAddID of "1" contains Alpha data as defined by the Codec
Mapping for the CodecID. Undefined values (i.e., values other than
0 or 1) SHOULD NOT be used, as the behavior of known implementations
is different.
-->
<dt>definition:</dt> <dt>definition:</dt>
<dd>Indicate whether the BlockAdditional Element with BlockAddID of &quot;1&quot <dd>Indicates whether the BlockAdditional Element with BlockAddID of "1" contain
; contains Alpha data, as defined by to the Codec Mapping for the <tt>CodecID</t s Alpha data, as defined by the Codec Mapping for the <tt>CodecID</tt>.
t>. Undefined values <bcp14>SHOULD NOT</bcp14> be used, as the behavior of known imp
Undefined values <bcp14>SHOULD NOT</bcp14> be used as the behavior of known impl lementations is different (considered either as 0 or 1).</dd>
ementations is different (considered either as 0 or 1).</dd> <dt>defined values:</dt>
<dd>See <xref target="AlphaModeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t> <table anchor="AlphaModeValues"><name>AlphaMode Values</name>
<table anchor="AlphaModeValues"><name>AlphaMode values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
<td align="left">none</td> <td align="left">none</td>
<td align="left">The BlockAdditional Element with BlockAddID of &quot;1&quot; do es not exist or <bcp14>SHOULD NOT</bcp14> be considered as containing such data. </td> <td align="left">The BlockAdditional Element with BlockAddID of "1" does not exi st or <bcp14>SHOULD NOT</bcp14> be considered as containing such data.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">present</td> <td align="left">present</td>
<td align="left">The BlockAdditional Element with BlockAddID of &quot;1&quot; co ntains alpha channel data.</td> <td align="left">The BlockAdditional Element with BlockAddID of "1" contains alp ha channel data.</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="oldstereomode-element"><name>OldStereoMode Element</name> <section anchor="oldstereomode-element"><name>OldStereoMode Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x53B9 / uinteger</dd> <dd>0x53B9 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\OldStereoMode</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\OldStereoMode</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>maxver:</dt> <dt>maxver:</dt>
<dd>2</dd> <dd>2</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Bogus StereoMode value used in old versions of libmatroska.</dd> <dd>Bogus StereoMode value used in old versions of libmatroska.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="OldStereoModeValues"/>.</dd>
<dt>usage notes:</dt>
<dd>This Element <bcp14>MUST NOT</bcp14> be used. It was an incorrect value used
in libmatroska up to 0.9.0.</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="OldStereoModeValues"><name>OldStereoMode Values</name>
<table anchor="OldStereoModeValues"><name>OldStereoMode values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2187 skipping to change at line 2526
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">left eye</td> <td align="left">left eye</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>3</tt></td> <td align="left"><tt>3</tt></td>
<td align="left">both eyes</td> <td align="left">both eyes</td>
</tr> </tr>
</tbody> </tbody>
</table> </table>
<dl spacing="compact">
<dt>usage notes:</dt>
<dd>This Element <bcp14>MUST NOT</bcp14> be used. It was an incorrect value used
in libmatroska up to 0.9.0.</dd>
</dl>
</section> </section>
<section anchor="pixelwidth-element"><name>PixelWidth Element</name> <section anchor="pixelwidth-element"><name>PixelWidth Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xB0 / uinteger</dd> <dd>0xB0 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\PixelWidth</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\PixelWidth</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Width of the encoded video frames in pixels.</dd> <dd>Width of the encoded video frames in pixels.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="pixelheight-element"><name>PixelHeight Element</name> <section anchor="pixelheight-element"><name>PixelHeight Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xBA / uinteger</dd> <dd>0xBA / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\PixelHeight</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\PixelHeight</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Height of the encoded video frames in pixels.</dd> <dd>Height of the encoded video frames in pixels.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="pixelcropbottom-element"><name>PixelCropBottom Element</name> <section anchor="pixelcropbottom-element"><name>PixelCropBottom Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x54AA / uinteger / 0</dd> <dd>0x54AA / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropBottom</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropBottom</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The number of video pixels to remove at the bottom of the image.</dd> <dd>The number of video pixels to remove at the bottom of the image.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="pixelcroptop-element"><name>PixelCropTop Element</name> <section anchor="pixelcroptop-element"><name>PixelCropTop Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x54BB / uinteger / 0</dd> <dd>0x54BB / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropTop</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropTop</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The number of video pixels to remove at the top of the image.</dd> <dd>The number of video pixels to remove at the top of the image.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="pixelcropleft-element"><name>PixelCropLeft Element</name> <section anchor="pixelcropleft-element"><name>PixelCropLeft Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x54CC / uinteger / 0</dd> <dd>0x54CC / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropLeft</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropLeft</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The number of video pixels to remove on the left of the image.</dd> <dd>The number of video pixels to remove on the left of the image.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="pixelcropright-element"><name>PixelCropRight Element</name> <section anchor="pixelcropright-element"><name>PixelCropRight Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x54DD / uinteger / 0</dd> <dd>0x54DD / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropRight</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\PixelCropRight</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The number of video pixels to remove on the right of the image.</dd> <dd>The number of video pixels to remove on the right of the image.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="displaywidth-element"><name>DisplayWidth Element</name> <section anchor="displaywidth-element"><name>DisplayWidth Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x54B0 / uinteger</dd> <dd>0x54B0 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\DisplayWidth</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\DisplayWidth</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Width of the video frames to display. Applies to the video frame after cropp ing (PixelCrop* Elements).</dd> <dd>Width of the video frames to display. Applies to the video frame after cropp ing (PixelCrop* Elements).</dd>
<dt>notes:</dt>
<dd>See <xref target="DisplayWidthNotes"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>notes:</t>
<table anchor="DisplayWidthNotes"><name>DisplayWidth implementation notes</name> <table anchor="DisplayWidthNotes"><name>DisplayWidth Implementation Notes</name>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">default</td> <td align="left">default</td>
<td align="left">If the DisplayUnit of the same TrackEntry is 0, then the defaul t value for DisplayWidth is equal toPixelWidth - PixelCropLeft - PixelCropRight, else there is no default value.</td> <td align="left">If the DisplayUnit of the same TrackEntry is 0, then the defaul t value for DisplayWidth is equal to PixelWidth - PixelCropLeft - PixelCropRight ; else, there is no default value.</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="displayheight-element"><name>DisplayHeight Element</name> <section anchor="displayheight-element"><name>DisplayHeight Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x54BA / uinteger</dd> <dd>0x54BA / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\DisplayHeight</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\DisplayHeight</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Height of the video frames to display. Applies to the video frame after crop ping (PixelCrop* Elements).</dd> <dd>Height of the video frames to display. Applies to the video frame after crop ping (PixelCrop* Elements).</dd>
<dt>notes:</dt>
<dd>See <xref target="DisplayHeightNotes"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>notes:</t> <table anchor="DisplayHeightNotes"><name>DisplayHeight Implementation Notes</nam
<table anchor="DisplayHeightNotes"><name>DisplayHeight implementation notes</nam e>
e>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">default</td> <td align="left">default</td>
<td align="left">If the DisplayUnit of the same TrackEntry is 0, then the defaul t value for DisplayHeight is equal toPixelHeight - PixelCropTop - PixelCropBotto m, else there is no default value.</td> <td align="left">If the DisplayUnit of the same TrackEntry is 0, then the defaul t value for DisplayHeight is equal to PixelHeight - PixelCropTop - PixelCropBott om; else, there is no default value.</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="displayunit-element"><name>DisplayUnit Element</name> <section anchor="displayunit-element"><name>DisplayUnit Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x54B2 / uinteger / 0</dd> <dd>0x54B2 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\DisplayUnit</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\DisplayUnit</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>How DisplayWidth &amp; DisplayHeight are interpreted.</dd> <dd>How DisplayWidth and DisplayHeight are interpreted.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="DisplayUnitValues"/>.</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="DisplayUnitValues"><name>DisplayUnit Values</name>
<table anchor="DisplayUnitValues"><name>DisplayUnit values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2398 skipping to change at line 2741
<tr> <tr>
<td align="left"><tt>3</tt></td> <td align="left"><tt>3</tt></td>
<td align="left">display aspect ratio</td> <td align="left">display aspect ratio</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>4</tt></td> <td align="left"><tt>4</tt></td>
<td align="left">unknown</td> <td align="left">unknown</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="uncompressedfourcc-element"><name>UncompressedFourCC Element</n ame> <section anchor="uncompressedfourcc-element"><name>UncompressedFourCC Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x2EB524 / binary</dd> <dd>0x2EB524 / binary</dd>
<dt>length:</dt> <dt>length:</dt>
<dd>4</dd> <dd>4</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\UncompressedFourCC</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\UncompressedFourCC</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>see implementation notes / 1</dd> <dd>see implementation notes / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specify the uncompressed pixel format used for the Track's data as a FourCC. <dd>Specifies the uncompressed pixel format used for the Track's data as a FourC
This value is similar in scope to the biCompression value of AVI's <tt>BITMAPINF C.
O</tt> <xref target="AVIFormat"></xref>. There is no definitive list of FourCC v This value is similar in scope to the biCompression value of AVI's <tt>BITMAPINF
alues, nor an official registry. Some common values for YUV pixel formats can be O</tt> <xref target="AVIFormat"></xref>. There is neither a definitive list of F
found at <xref target="MSYUV8"></xref>, <xref target="MSYUV16"></xref> and <xre ourCC values nor an official registry. Some common values for YUV pixel formats
f target="FourCC-YUV"></xref>. Some common values for uncompressed RGB pixel for can be found at <xref target="MSYUV8"></xref>, <xref target="MSYUV16"></xref>, a
mats can be found at <xref target="MSRGB"></xref> and <xref target="FourCC-RGB"> nd <xref target="FourCC-YUV"></xref>. Some common values for uncompressed RGB pi
</xref>.</dd> xel formats can be found at <xref target="MSRGB"></xref> and <xref target="FourC
C-RGB"></xref>.</dd>
<dt>notes:</dt>
<dd>See <xref target="UncompressedFourCCNotes"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>notes:</t> <table anchor="UncompressedFourCCNotes"><name>UncompressedFourCC Implementation
<table anchor="UncompressedFourCCNotes"><name>UncompressedFourCC implementation Notes</name>
notes</name>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">minOccurs</td> <td align="left">minOccurs</td>
<td align="left">UncompressedFourCC <bcp14>MUST</bcp14> be set (minOccurs=1) in TrackEntry, when the CodecID Element of the TrackEntry is set to &quot;V_UNCOMPR ESSED&quot;.</td> <td align="left">UncompressedFourCC <bcp14>MUST</bcp14> be set (minOccurs=1) in TrackEntry when the CodecID Element of the TrackEntry is set to "V_UNCOMPRESSED" .</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="colour-element"><name>Colour Element</name> <section anchor="colour-element"><name>Colour Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55B0 / master</dd> <dd>0x55B0 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Settings describing the colour format.</dd> <dd>Settings describing the colour format.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="matrixcoefficients-element"><name>MatrixCoefficients Element</n ame> <section anchor="matrixcoefficients-element"><name>MatrixCoefficients Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55B1 / uinteger / 2</dd> <dd>0x55B1 / uinteger / 2</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MatrixCoefficients</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MatrixCoefficients</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The Matrix Coefficients of the video used to derive luma and chroma values f rom red, green, and blue color primaries. <dd>The Matrix Coefficients of the video used to derive luma and chroma values f rom red, green, and blue color primaries.
For clarity, the value and meanings for MatrixCoefficients are adopted from Tabl e 4 of <xref target="ITU-H.273"></xref>.</dd> For clarity, the value and meanings for MatrixCoefficients are adopted from Tabl e 4 of <xref target="ITU-H.273"></xref>.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="MatrixCoefficientsValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="MatrixCoefficientsValues"><name>MatrixCoefficients Values</name>
<table anchor="MatrixCoefficientsValues"><name>MatrixCoefficients values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2550 skipping to change at line 2901
<tr> <tr>
<td align="left"><tt>13</tt></td> <td align="left"><tt>13</tt></td>
<td align="left">Chroma-derived Constant Luminance</td> <td align="left">Chroma-derived Constant Luminance</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>14</tt></td> <td align="left"><tt>14</tt></td>
<td align="left">ITU-R BT.2100-0</td> <td align="left">ITU-R BT.2100-0</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="bitsperchannel-element"><name>BitsPerChannel Element</name> <section anchor="bitsperchannel-element"><name>BitsPerChannel Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55B2 / uinteger / 0</dd> <dd>0x55B2 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\BitsPerChannel</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\BitsPerChannel</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Number of decoded bits per channel. A value of 0 indicates that the BitsPerC hannel is unspecified.</dd> <dd>Number of decoded bits per channel. A value of 0 indicates that the BitsPerC hannel is unspecified.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="chromasubsamplinghorz-element"><name>ChromaSubsamplingHorz Elem ent</name> <section anchor="chromasubsamplinghorz-element"><name>ChromaSubsamplingHorz Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55B3 / uinteger</dd> <dd>0x55B3 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSubsamplingHorz</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSubsamplingHorz</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The amount of pixels to remove in the Cr and Cb channels for every pixel not <dd>The number of pixels to remove in the Cr and Cb channels for every pixel not
removed horizontally. removed horizontally. Example: For video with 4:2:0 chroma subsampling, the Chr
Example: For video with 4:2:0 chroma subsampling, the ChromaSubsamplingHorz <bcp omaSubsamplingHorz
14>SHOULD</bcp14> be set to 1.</dd> <bcp14>SHOULD</bcp14> be set to 1.
</dl> </dd>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t> <dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</section> </dl></section>
<section anchor="chromasubsamplingvert-element"><name>ChromaSubsamplingVert Elem ent</name> <section anchor="chromasubsamplingvert-element"><name>ChromaSubsamplingVert Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55B4 / uinteger</dd> <dd>0x55B4 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSubsamplingVert</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSubsamplingVert</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The amount of pixels to remove in the Cr and Cb channels for every pixel not <dd>The number of pixels to remove in the Cr and Cb channels for every pixel not
removed vertically. removed vertically. Example: For video with 4:2:0 chroma subsampling, the Chrom
Example: For video with 4:2:0 chroma subsampling, the ChromaSubsamplingVert <bcp aSubsamplingVert
14>SHOULD</bcp14> be set to 1.</dd> <bcp14>SHOULD</bcp14> be set to 1.
</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="cbsubsamplinghorz-element"><name>CbSubsamplingHorz Element</nam e> <section anchor="cbsubsamplinghorz-element"><name>CbSubsamplingHorz Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55B5 / uinteger</dd> <dd>0x55B5 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\CbSubsamplingHorz</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\CbSubsamplingHorz</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The amount of pixels to remove in the Cb channel for every pixel not removed <dd>The number of pixels to remove in the Cb channel for every pixel not removed
horizontally. horizontally.
This is additive with ChromaSubsamplingHorz. Example: For video with 4:2:1 chrom This is additive with ChromaSubsamplingHorz.
a subsampling, Example: For video with 4:2:1 chroma
the ChromaSubsamplingHorz <bcp14>SHOULD</bcp14> be set to 1 and CbSubsamplingHor subsampling, the ChromaSubsamplingHorz <bcp14>SHOULD</bcp14> be set to 1, and Cb
z <bcp14>SHOULD</bcp14> be set to 1.</dd> SubsamplingHorz <bcp14>SHOULD</bcp14> be set to 1.
</dl> </dd>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t> <dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</section> </dl></section>
<section anchor="cbsubsamplingvert-element"><name>CbSubsamplingVert Element</nam e> <section anchor="cbsubsamplingvert-element"><name>CbSubsamplingVert Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55B6 / uinteger</dd> <dd>0x55B6 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\CbSubsamplingVert</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\CbSubsamplingVert</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The amount of pixels to remove in the Cb channel for every pixel not removed vertically. <dd>The number of pixels to remove in the Cb channel for every pixel not removed vertically.
This is additive with ChromaSubsamplingVert.</dd> This is additive with ChromaSubsamplingVert.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="chromasitinghorz-element"><name>ChromaSitingHorz Element</name> <section anchor="chromasitinghorz-element"><name>ChromaSitingHorz Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55B7 / uinteger / 0</dd> <dd>0x55B7 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSitingHorz</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSitingHorz</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>How chroma is subsampled horizontally.</dd> <dd>How chroma is subsampled horizontally.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="ChromaSitingHorzValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="ChromaSitingHorzValues"><name>ChromaSitingHorz Values</name>
<table anchor="ChromaSitingHorzValues"><name>ChromaSitingHorz values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2682 skipping to change at line 3038
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">left collocated</td> <td align="left">left collocated</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">half</td> <td align="left">half</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="chromasitingvert-element"><name>ChromaSitingVert Element</name> <section anchor="chromasitingvert-element"><name>ChromaSitingVert Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55B8 / uinteger / 0</dd> <dd>0x55B8 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSitingVert</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\ChromaSitingVert</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>How chroma is subsampled vertically.</dd> <dd>How chroma is subsampled vertically.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="ChromaSitingVertValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="ChromaSitingVertValues"><name>ChromaSitingVert Values</name>
<table anchor="ChromaSitingVertValues"><name>ChromaSitingVert values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2724 skipping to change at line 3083
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">top collocated</td> <td align="left">top collocated</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">half</td> <td align="left">half</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="range-element"><name>Range Element</name> <section anchor="range-element"><name>Range Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55B9 / uinteger / 0</dd> <dd>0x55B9 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\Range</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\Range</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Clipping of the color ranges.</dd> <dd>Clipping of the color ranges.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="RangeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t>
<table anchor="RangeValues"><name>Range values</name> <table anchor="RangeValues"><name>Range Values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2771 skipping to change at line 3134
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">full range (no clipping)</td> <td align="left">full range (no clipping)</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>3</tt></td> <td align="left"><tt>3</tt></td>
<td align="left">defined by MatrixCoefficients / TransferCharacteristics</td> <td align="left">defined by MatrixCoefficients / TransferCharacteristics</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="transfercharacteristics-element"><name>TransferCharacteristics Element</name> <section anchor="transfercharacteristics-element"><name>TransferCharacteristics Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55BA / uinteger / 2</dd> <dd>0x55BA / uinteger / 2</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\TransferCharacteristics</tt></dd > <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\TransferCharacteristics</tt></dd >
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The transfer characteristics of the video. For clarity, <dd>The transfer characteristics of the video. For clarity,
the value and meanings for TransferCharacteristics are adopted from Table 3 of < xref target="ITU-H.273"></xref>.</dd> the value and meanings for TransferCharacteristics are adopted from Table 3 of < xref target="ITU-H.273"></xref>.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="TransferCharacteristicsValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="TransferCharacteristicsValues"><name>TransferCharacteristics Valu
<table anchor="TransferCharacteristicsValues"><name>TransferCharacteristics valu es</name>
es</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2894 skipping to change at line 3260
<tr> <tr>
<td align="left"><tt>17</tt></td> <td align="left"><tt>17</tt></td>
<td align="left">SMPTE ST 428-1</td> <td align="left">SMPTE ST 428-1</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>18</tt></td> <td align="left"><tt>18</tt></td>
<td align="left">ARIB STD-B67 (HLG)</td> <td align="left">ARIB STD-B67 (HLG)</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="primaries-element"><name>Primaries Element</name> <section anchor="primaries-element"><name>Primaries Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x55BB / uinteger / 2</dd> <dd>0x55BB / uinteger / 2</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\Primaries</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\Primaries</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The colour primaries of the video. For clarity, <dd>The colour primaries of the video. For clarity,
the value and meanings for Primaries are adopted from Table 2 of <xref target="I TU-H.273"></xref>.</dd> the value and meanings for Primaries are adopted from Table 2 of <xref target="I TU-H.273"></xref>.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="PrimariesValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t>
<table anchor="PrimariesValues"><name>Primaries values</name> <table anchor="PrimariesValues"><name>Primaries Values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 2992 skipping to change at line 3362
<tr> <tr>
<td align="left"><tt>12</tt></td> <td align="left"><tt>12</tt></td>
<td align="left">SMPTE EG 432-2</td> <td align="left">SMPTE EG 432-2</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>22</tt></td> <td align="left"><tt>22</tt></td>
<td align="left">EBU Tech. 3213-E - JEDEC P22 phosphors</td> <td align="left">EBU Tech. 3213-E - JEDEC P22 phosphors</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="maxcll-element"><name>MaxCLL Element</name> <section anchor="maxcll-element"><name>MaxCLL Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55BC / uinteger</dd> <dd>0x55BC / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MaxCLL</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MaxCLL</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Maximum brightness of a single pixel (Maximum Content Light Level) <dd>Maximum brightness of a single pixel (Maximum Content Light Level)
in candelas per square meter (cd/m<sup>2</sup>).</dd> in candelas per square meter (cd/m<sup>2</sup>).</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="maxfall-element"><name>MaxFALL Element</name> <section anchor="maxfall-element"><name>MaxFALL Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55BD / uinteger</dd> <dd>0x55BD / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MaxFALL</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MaxFALL</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Maximum brightness of a single full frame (Maximum Frame-Average Light Level ) <dd>Maximum brightness of a single full frame (Maximum Frame-Average Light Level )
in candelas per square meter (cd/m<sup>2</sup>).</dd> in candelas per square meter (cd/m<sup>2</sup>).</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="masteringmetadata-element"><name>MasteringMetadata Element</nam e> <section anchor="masteringmetadata-element"><name>MasteringMetadata Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D0 / master</dd> <dd>0x55D0 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>SMPTE 2086 mastering data.</dd> <dd>SMPTE 2086 mastering data.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="primaryrchromaticityx-element"><name>PrimaryRChromaticityX Elem ent</name> <section anchor="primaryrchromaticityx-element"><name>PrimaryRChromaticityX Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D1 / float</dd> <dd>0x55D1 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryRChroma ticityX</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryRChroma ticityX</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Red X chromaticity coordinate, as defined by <xref target="CIE-1931"></xref> .</dd> <dd>Red X chromaticity coordinate, as defined by <xref target="CIE-1931"></xref> .</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="primaryrchromaticityy-element"><name>PrimaryRChromaticityY Elem ent</name> <section anchor="primaryrchromaticityy-element"><name>PrimaryRChromaticityY Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D2 / float</dd> <dd>0x55D2 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryRChroma ticityY</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryRChroma ticityY</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Red Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xref> .</dd> <dd>Red Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xref> .</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="primarygchromaticityx-element"><name>PrimaryGChromaticityX Elem ent</name> <section anchor="primarygchromaticityx-element"><name>PrimaryGChromaticityX Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D3 / float</dd> <dd>0x55D3 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryGChroma ticityX</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryGChroma ticityX</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Green X chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd> <dd>Green X chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="primarygchromaticityy-element"><name>PrimaryGChromaticityY Elem ent</name> <section anchor="primarygchromaticityy-element"><name>PrimaryGChromaticityY Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D4 / float</dd> <dd>0x55D4 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryGChroma ticityY</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryGChroma ticityY</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Green Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd> <dd>Green Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="primarybchromaticityx-element"><name>PrimaryBChromaticityX Elem ent</name> <section anchor="primarybchromaticityx-element"><name>PrimaryBChromaticityX Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D5 / float</dd> <dd>0x55D5 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryBChroma ticityX</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryBChroma ticityX</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Blue X chromaticity coordinate, as defined by <xref target="CIE-1931"></xref >.</dd> <dd>Blue X chromaticity coordinate, as defined by <xref target="CIE-1931"></xref >.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="primarybchromaticityy-element"><name>PrimaryBChromaticityY Elem ent</name> <section anchor="primarybchromaticityy-element"><name>PrimaryBChromaticityY Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D6 / float</dd> <dd>0x55D6 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryBChroma ticityY</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\PrimaryBChroma ticityY</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Blue Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xref >.</dd> <dd>Blue Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xref >.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="whitepointchromaticityx-element"><name>WhitePointChromaticityX Element</name> <section anchor="whitepointchromaticityx-element"><name>WhitePointChromaticityX Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D7 / float</dd> <dd>0x55D7 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\WhitePointChro maticityX</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\WhitePointChro maticityX</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>White X chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd> <dd>White X chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="whitepointchromaticityy-element"><name>WhitePointChromaticityY Element</name> <section anchor="whitepointchromaticityy-element"><name>WhitePointChromaticityY Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D8 / float</dd> <dd>0x55D8 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0x0p+0-0x1p+0</dd> <dd>0x0p+0-0x1p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\WhitePointChro maticityY</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\WhitePointChro maticityY</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>White Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd> <dd>White Y chromaticity coordinate, as defined by <xref target="CIE-1931"></xre f>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="luminancemax-element"><name>LuminanceMax Element</name> <section anchor="luminancemax-element"><name>LuminanceMax Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55D9 / float</dd> <dd>0x55D9 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt;= 0x0p+0</dd> <dd>&gt;= 0x0p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\LuminanceMax</ tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\LuminanceMax</ tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Maximum luminance. Represented in candelas per square meter (cd/m<sup>2</sup >).</dd> <dd>Maximum luminance. Represented in candelas per square meter (cd/m<sup>2</sup >).</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="luminancemin-element"><name>LuminanceMin Element</name> <section anchor="luminancemin-element"><name>LuminanceMin Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x55DA / float</dd> <dd>0x55DA / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt;= 0x0p+0</dd> <dd>&gt;= 0x0p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\LuminanceMin</ tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Colour\MasteringMetadata\LuminanceMin</ tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Minimum luminance. Represented in candelas per square meter (cd/m<sup>2</sup >).</dd> <dd>Minimum luminance. Represented in candelas per square meter (cd/m<sup>2</sup >).</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="projection-element"><name>Projection Element</name> <section anchor="projection-element"><name>Projection Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x7670 / master</dd> <dd>0x7670 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Projection</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Projection</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Describes the video projection details. Used to render spherical, VR videos <!-- [rfced] We updated this sentence as follows. Please review and let us
or flipping videos horizontally/vertically.</dd> know any concerns.
</dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t> Original:
</section> Used to render spherical, VR videos or flipping videos
horizontally/vertically.
Updated:
Used to render spherical or VR videos or to flip videos horizontally
or vertically.
-->
<dd>Describes the video projection details. Used to render spherical or VR video
s or to flip videos horizontally or vertically.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl></section>
<section anchor="projectiontype-element"><name>ProjectionType Element</name> <section anchor="projectiontype-element"><name>ProjectionType Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x7671 / uinteger / 0</dd> <dd>0x7671 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionType</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionType</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Describes the projection used for this video track.</dd> <dd>Describes the projection used for this video track.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="ProjectionTypeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="ProjectionTypeValues"><name>ProjectionType Values</name>
<table anchor="ProjectionTypeValues"><name>ProjectionType values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 3299 skipping to change at line 3682
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">cubemap</td> <td align="left">cubemap</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>3</tt></td> <td align="left"><tt>3</tt></td>
<td align="left">mesh</td> <td align="left">mesh</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="projectionprivate-element"><name>ProjectionPrivate Element</nam e> <section anchor="projectionprivate-element"><name>ProjectionPrivate Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x7672 / binary</dd> <dd>0x7672 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionPrivate</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionPrivate</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Private data that only applies to a specific projection.</dd> <dd><t>Private data that only applies to a specific projection.</t>
</dl>
<ul spacing="compact"> <ul spacing="compact">
<li>If <tt>ProjectionType</tt> equals 0 (Rectangular), <li>If <tt>ProjectionType</tt> equals 0 (rectangular),
then this element <bcp14>MUST NOT</bcp14> be present.</li> then this element <bcp14>MUST NOT</bcp14> be present.</li>
<li>If <tt>ProjectionType</tt> equals 1 (Equirectangular), then this element <bc <li>If <tt>ProjectionType</tt> equals 1 (equirectangular), then this element <bc
p14>MUST</bcp14> be present and contain the same binary data that would be store p14>MUST</bcp14> be present and contain the same binary data that would be store
d inside d inside
an ISOBMFF Equirectangular Projection Box ('equi').</li> an ISOBMFF Equirectangular Projection Box ("equi").</li>
<li>If <tt>ProjectionType</tt> equals 2 (Cubemap), then this element <bcp14>MUST <li>If <tt>ProjectionType</tt> equals 2 (cubemap), then this element <bcp14>MUST
</bcp14> be present and contain the same binary data that would be stored </bcp14> be present and contain the same binary data that would be stored
inside an ISOBMFF Cubemap Projection Box ('cbmp').</li> inside an ISOBMFF Cubemap Projection Box ("cbmp").</li>
<li>If <tt>ProjectionType</tt> equals 3 (Mesh), then this element <bcp14>MUST</b <li>If <tt>ProjectionType</tt> equals 3 (mesh), then this element <bcp14>MUST</b
cp14> be present and contain the same binary data that would be stored inside cp14> be present and contain the same binary data that would be stored inside
an ISOBMFF Mesh Projection Box ('mshp').</li> an ISOBMFF Mesh Projection Box ("mshp").</li>
</ul> </ul>
</dd>
<dl spacing="compact">
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>ISOBMFF box size and fourcc fields are not included in the binary data, <dd>ISOBMFF box size and fourcc fields are not included in the binary data,
but the FullBox version and flag fields are. This is to avoid but the FullBox version and flag fields are. This is to avoid
redundant framing information while preserving versioning and semantics between the two container formats.</dd> redundant framing information while preserving versioning and semantics between the two container formats.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<!-- [rfced] Please review "both included" in Sections 5.1.4.1.28.44 through
5.1.4.1.28.46. Is the meaning here "inclusive"?
Original:
The value of this element MUST be in the -180 to 180 degree range,
both included.
...
The value of this element MUST be in the -90 to 90 degree range, both
included.
...
The value of this element MUST be in the -180 to 180 degree range, both
included.
Perhaps:
The value of this element MUST be in the -180 to 180 (inclusive) degree range.
...
The value of this element MUST be in the -90 to 90 (inclusive) degree range.
...
The value of this element MUST be in the -180 to 180 (inclusive) degree range.
-->
<section anchor="projectionposeyaw-element"><name>ProjectionPoseYaw Element</nam e> <section anchor="projectionposeyaw-element"><name>ProjectionPoseYaw Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x7673 / float / 0x0p+0</dd> <dd>0x7673 / float / 0x0p+0</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt;= -0xB4p+0, &lt;= 0xB4p+0</dd> <dd>&gt;= -0xB4p+0, &lt;= 0xB4p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionPoseYaw</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\Projection\ProjectionPoseYaw</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specifies a yaw rotation to the projection.</dd> <dd>Specifies a yaw rotation to the projection.</dd>
</dl> </dl>
<t>Value represents a clockwise rotation, in degrees, around the up vector. This rotation must be applied <t>Value represents a clockwise rotation, in degrees, around the up vector. This rotation must be applied
before any <tt>ProjectionPosePitch</tt> or <tt>ProjectionPoseRoll</tt> rotations . before any <tt>ProjectionPosePitch</tt> or <tt>ProjectionPoseRoll</tt> rotations .
The value of this element <bcp14>MUST</bcp14> be in the -180 to 180 degree range , both included.</t> The value of this element <bcp14>MUST</bcp14> be in the -180 to 180 degree range , both included.</t>
<t>Setting <tt>ProjectionPoseYaw</tt> to 180 or -180 degrees, with the <tt>Proje <t>Setting <tt>ProjectionPoseYaw</tt> to 180 or -180 degrees with <tt>Projection
ctionPoseRoll</tt> and <tt>ProjectionPosePitch</tt> set to 0 degrees flips the i PoseRoll</tt> and <tt>ProjectionPosePitch</tt> set to 0 degrees flips the image
mage horizontally.</t> horizontally.</t>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t> <dl spacing="compact">
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl>
</section> </section>
<section anchor="projectionposepitch-element"><name>ProjectionPosePitch Element< /name> <section anchor="projectionposepitch-element"><name>ProjectionPosePitch Element< /name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x7674 / float / 0x0p+0</dd> <dd>0x7674 / float / 0x0p+0</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt;= -0x5Ap+0, &lt;= 0x5Ap+0</dd> <dd>&gt;= -0x5Ap+0, &lt;= 0x5Ap+0</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 3379 skipping to change at line 3784
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specifies a pitch rotation to the projection.</dd> <dd>Specifies a pitch rotation to the projection.</dd>
</dl> </dl>
<t>Value represents a counter-clockwise rotation, in degrees, around the right v ector. This rotation must be applied <t>Value represents a counter-clockwise rotation, in degrees, around the right v ector. This rotation must be applied
after the <tt>ProjectionPoseYaw</tt> rotation and before the <tt>ProjectionPoseR oll</tt> rotation. after the <tt>ProjectionPoseYaw</tt> rotation and before the <tt>ProjectionPoseR oll</tt> rotation.
The value of this element <bcp14>MUST</bcp14> be in the -90 to 90 degree range, both included.</t> The value of this element <bcp14>MUST</bcp14> be in the -90 to 90 degree range, both included.</t>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t> <dl spacing="compact">
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl>
</section> </section>
<section anchor="projectionposeroll-element"><name>ProjectionPoseRoll Element</n ame> <section anchor="projectionposeroll-element"><name>ProjectionPoseRoll Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x7675 / float / 0x0p+0</dd> <dd>0x7675 / float / 0x0p+0</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt;= -0xB4p+0, &lt;= 0xB4p+0</dd> <dd>&gt;= -0xB4p+0, &lt;= 0xB4p+0</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 3401 skipping to change at line 3809
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specifies a roll rotation to the projection.</dd> <dd>Specifies a roll rotation to the projection.</dd>
</dl> </dl>
<t>Value represents a counter-clockwise rotation, in degrees, around the forward vector. This rotation must be applied <t>Value represents a counter-clockwise rotation, in degrees, around the forward vector. This rotation must be applied
after the <tt>ProjectionPoseYaw</tt> and <tt>ProjectionPosePitch</tt> rotations. after the <tt>ProjectionPoseYaw</tt> and <tt>ProjectionPosePitch</tt> rotations.
The value of this element <bcp14>MUST</bcp14> be in the -180 to 180 degree range , both included.</t> The value of this element <bcp14>MUST</bcp14> be in the -180 to 180 degree range , both included.</t>
<t>Setting <tt>ProjectionPoseRoll</tt> to 180 or -180 degrees, the <tt>Projectio <t>Setting <tt>ProjectionPoseRoll</tt> to 180 or -180 degrees and <tt>Projection
nPoseYaw</tt> to 180 or -180 degrees with <tt>ProjectionPosePitch</tt> set to 0 PoseYaw</tt> to 180 or -180 degrees with <tt>ProjectionPosePitch</tt> set to 0 d
degrees flips the image vertically.</t> egrees flips the image vertically.</t>
<t>Setting <tt>ProjectionPoseRoll</tt> to 180 or -180 degrees, with the <tt>Proj <t>Setting <tt>ProjectionPoseRoll</tt> to 180 or -180 degrees with <tt>Projectio
ectionPoseYaw</tt> and <tt>ProjectionPosePitch</tt> set to 0 degrees flips the i nPoseYaw</tt> and <tt>ProjectionPosePitch</tt> set to 0 degrees flips the image
mage horizontally and vertically.</t> horizontally and vertically.</t>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t> <dl spacing="compact">
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl>
</section> </section>
</section> </section>
<section anchor="audio-element"><name>Audio Element</name> <section anchor="audio-element"><name>Audio Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE1 / master</dd> <dd>0xE1 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Audio</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Audio</tt></dd>
skipping to change at line 3433 skipping to change at line 3844
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0xB5 / float / 0x1.f4p+12</dd> <dd>0xB5 / float / 0x1.f4p+12</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt; 0x0p+0</dd> <dd>&gt; 0x0p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Audio\SamplingFrequency</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Audio\SamplingFrequency</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Sampling frequency in Hz.</dd> <dd>Sampling frequency in Hz.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="outputsamplingfrequency-element"><name>OutputSamplingFrequency Element</name> <section anchor="outputsamplingfrequency-element"><name>OutputSamplingFrequency Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x78B5 / float</dd> <dd>0x78B5 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt; 0x0p+0</dd> <dd>&gt; 0x0p+0</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 3449 skipping to change at line 3860
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x78B5 / float</dd> <dd>0x78B5 / float</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>&gt; 0x0p+0</dd> <dd>&gt; 0x0p+0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Audio\OutputSamplingFrequency</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Audio\OutputSamplingFrequency</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Real output sampling frequency in Hz (used for SBR techniques).</dd> <dd>Real output sampling frequency in Hz (used for SBR techniques).</dd>
<dt>notes:</dt>
<dd>See <xref target="OutputSamplingFrequencyNotes"/>.</dd>
</dl> </dl>
<t>notes:</t> <table anchor="OutputSamplingFrequencyNotes"><name>OutputSamplingFrequency Imple
<table anchor="OutputSamplingFrequencyNotes"><name>OutputSamplingFrequency imple mentation Notes</name>
mentation notes</name>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">default</td> <td align="left">default</td>
<td align="left">The default value for OutputSamplingFrequency of the same Track Entry is equal to the SamplingFrequency.</td> <td align="left">The default value for OutputSamplingFrequency of the same Track Entry is equal to the SamplingFrequency.</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="channels-element"><name>Channels Element</name> <section anchor="channels-element"><name>Channels Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x9F / uinteger / 1</dd> <dd>0x9F / uinteger / 1</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Audio\Channels</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Audio\Channels</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Numbers of channels in the track.</dd> <dd>Numbers of channels in the track.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="bitdepth-element"><name>BitDepth Element</name> <section anchor="bitdepth-element"><name>BitDepth Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6264 / uinteger</dd> <dd>0x6264 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Audio\BitDepth</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Audio\BitDepth</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Bits per sample, mostly used for PCM.</dd> <dd>Bits per sample, mostly used for PCM.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
</section> </section>
<section anchor="trackoperation-element"><name>TrackOperation Element</name> <section anchor="trackoperation-element"><name>TrackOperation Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE2 / master</dd> <dd>0xE2 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOperation</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOperation</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Operation that needs to be applied on tracks to create this virtual track. <dd>Operation that needs to be applied on tracks to create this virtual track. F
For more details look at <xref target="track-operation"></xref>.</dd> or more details, see <xref target="track-operation"></xref>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
<section anchor="trackcombineplanes-element"><name>TrackCombinePlanes Element</n ame> <section anchor="trackcombineplanes-element"><name>TrackCombinePlanes Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE3 / master</dd> <dd>0xE3 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains the list of all video plane tracks that need to be combined to crea <dd>Contains the list of all video plane tracks that need to be combined to crea
te this 3D track</dd> te this 3D track.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="trackplane-element"><name>TrackPlane Element</name> <section anchor="trackplane-element"><name>TrackPlane Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE4 / master</dd> <dd>0xE4 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes\TrackPlane< /tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes\TrackPlane< /tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains a video plane track that need to be combined to create this 3D trac <dd>Contains a video plane track that needs to be combined to create this 3D tra
k</dd> ck.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="trackplaneuid-element"><name>TrackPlaneUID Element</name> <section anchor="trackplaneuid-element"><name>TrackPlaneUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE5 / uinteger</dd> <dd>0xE5 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes\TrackPlane\ TrackPlaneUID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes\TrackPlane\ TrackPlaneUID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The trackUID number of the track representing the plane.</dd> <dd>The trackUID number of the track representing the plane.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="trackplanetype-element"><name>TrackPlaneType Element</name> <section anchor="trackplanetype-element"><name>TrackPlaneType Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE6 / uinteger</dd> <dd>0xE6 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes\TrackPlane\ TrackPlaneType</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackCombinePlanes\TrackPlane\ TrackPlaneType</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The kind of plane this track corresponds to.</dd> <dd>The kind of plane this track corresponds to.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="TrackPlaneTypeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="TrackPlaneTypeValues"><name>TrackPlaneType Values</name>
<table anchor="TrackPlaneTypeValues"><name>TrackPlaneType values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 3612 skipping to change at line 4028
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">right eye</td> <td align="left">right eye</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">background</td> <td align="left">background</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="trackjoinblocks-element"><name>TrackJoinBlocks Element</name> <section anchor="trackjoinblocks-element"><name>TrackJoinBlocks Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xE9 / master</dd> <dd>0xE9 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackJoinBlocks</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackJoinBlocks</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains the list of all tracks whose Blocks need to be combined to create t <dd>Contains the list of all tracks whose Blocks need to be combined to create t
his virtual track</dd> his virtual track.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="trackjoinuid-element"><name>TrackJoinUID Element</name> <section anchor="trackjoinuid-element"><name>TrackJoinUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xED / uinteger</dd> <dd>0xED / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackJoinBlocks\TrackJoinUID</ tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOperation\TrackJoinBlocks\TrackJoinUID</ tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The trackUID number of a track whose blocks are used to create this virtual track.</dd> <dd>The trackUID number of a track whose blocks are used to create this virtual track.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
</section> </section>
<section anchor="contentencodings-element"><name>ContentEncodings Element</name> <section anchor="contentencodings-element"><name>ContentEncodings Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6D80 / master</dd> <dd>0x6D80 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Settings for several content encoding mechanisms like compression or encrypt ion.</dd> <dd>Settings for several content encoding mechanisms like compression or encrypt ion.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
<section anchor="contentencoding-element"><name>ContentEncoding Element</name> <section anchor="contentencoding-element"><name>ContentEncoding Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6240 / master</dd> <dd>0x6240 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Settings for one content encoding like compression or encryption.</dd> <dd>Settings for one content encoding like compression or encryption.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="contentencodingorder-element"><name>ContentEncodingOrder Elemen t</name> <section anchor="contentencodingorder-element"><name>ContentEncodingOrder Elemen t</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x5031 / uinteger / 0</dd> <dd>0x5031 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncod ingOrder</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncod ingOrder</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<!-- [rfced] May we rephrase the first sentence of this definition as follows
for clarity?
Original:
Tell in which order to apply each ContentEncoding of the
ContentEncodings.
Perhaps:
Defines the order to apply to each ContentEncoding of the ContentEncodings.
-->
<dd>Tell in which order to apply each <tt>ContentEncoding</tt> of the <tt>Conten tEncodings</tt>. <dd>Tell in which order to apply each <tt>ContentEncoding</tt> of the <tt>Conten tEncodings</tt>.
The decoder/demuxer <bcp14>MUST</bcp14> start with the <tt>ContentEncoding</tt> with the highest <tt>ContentEncodingOrder</tt> and work its way down to the <tt> ContentEncoding</tt> with the lowest <tt>ContentEncodingOrder</tt>. The decoder/demuxer <bcp14>MUST</bcp14> start with the <tt>ContentEncoding</tt> with the highest <tt>ContentEncodingOrder</tt> and work its way down to the <tt> ContentEncoding</tt> with the lowest <tt>ContentEncodingOrder</tt>.
This value <bcp14>MUST</bcp14> be unique over for each <tt>ContentEncoding</tt> This value <bcp14>MUST</bcp14> be unique for each <tt>ContentEncoding</tt> found
found in the <tt>ContentEncodings</tt> of this <tt>TrackEntry</tt>.</dd> in the <tt>ContentEncodings</tt> of this <tt>TrackEntry</tt>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="contentencodingscope-element"><name>ContentEncodingScope Elemen t</name> <section anchor="contentencodingscope-element"><name>ContentEncodingScope Elemen t</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x5032 / uinteger / 1</dd> <dd>0x5032 / uinteger / 1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncod ingScope</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncod ingScope</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A bit field that describes which Elements have been modified in this way. <dd>A bit field that describes which Elements have been modified in this way.
Values (big-endian) can be OR'ed.</dd> Values (big-endian) can be OR'ed.</dd>
<dt>defined values:</dt>
<dd>See <xref target="ContentEncodingScopeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t> <table anchor="ContentEncodingScopeValues"><name>ContentEncodingScope Values</na
<table anchor="ContentEncodingScopeValues"><name>ContentEncodingScope values</na me>
me>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 3737 skipping to change at line 4165
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">Private</td> <td align="left">Private</td>
<td align="left">The track's <tt>CodecPrivate</tt> data.</td> <td align="left">The track's <tt>CodecPrivate</tt> data.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>4</tt></td> <td align="left"><tt>4</tt></td>
<td align="left">Next</td> <td align="left">Next</td>
<td align="left">The next ContentEncoding (next <tt>ContentEncodingOrder</tt>. E ither the data inside <tt>ContentCompression</tt> and/or <tt>ContentEncryption</ tt>).This value <bcp14>SHOULD NOT</bcp14> be used as it's not supported by playe rs.</td> <td align="left">The next ContentEncoding (next <tt>ContentEncodingOrder</tt>; t he data inside <tt>ContentCompression</tt> and/or <tt>ContentEncryption</tt>). T his value <bcp14>SHOULD NOT</bcp14> be used, as it's not supported by players.</ td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="contentencodingtype-element"><name>ContentEncodingType Element< /name> <section anchor="contentencodingtype-element"><name>ContentEncodingType Element< /name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x5033 / uinteger / 0</dd> <dd>0x5033 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncod ingType</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncod ingType</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A value describing what kind of transformation is applied.</dd> <dd>A value describing the kind of transformation that is applied.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="ContentEncodingTypeValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>restrictions:</t>
<table anchor="ContentEncodingTypeValues"><name>ContentEncodingType values</name <table anchor="ContentEncodingTypeValues"><name>ContentEncodingType Values</name
> >
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
<td align="left">Compression</td> <td align="left">Compression</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">Encryption</td> <td align="left">Encryption</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="contentcompression-element"><name>ContentCompression Element</n ame> <section anchor="contentcompression-element"><name>ContentCompression Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x5034 / master</dd> <dd>0x5034 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentCompr ession</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentCompr ession</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Settings describing the compression used. <dd>Settings describing the compression used.
This Element <bcp14>MUST</bcp14> be present if the value of ContentEncodingType is 0 and absent otherwise. This Element <bcp14>MUST</bcp14> be present if the value of ContentEncodingType is 0 and absent otherwise.
Each block <bcp14>MUST</bcp14> be decompressable even if no previous block is av Each block <bcp14>MUST</bcp14> be decompressable, even if no previous block is a
ailable in order not to prevent seeking.</dd> vailable in order to not prevent seeking.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="contentcompalgo-element"><name>ContentCompAlgo Element</name> <section anchor="contentcompalgo-element"><name>ContentCompAlgo Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x4254 / uinteger / 0</dd> <dd>0x4254 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentCompr ession\ContentCompAlgo</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentCompr ession\ContentCompAlgo</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The compression algorithm used.</dd> <dd>The compression algorithm used.</dd>
<dt>defined values:</dt>
<dd>See <xref target="ContentCompAlgoValues"/>.</dd>
<dt>usage notes:</dt>
<dd>Compression method "1" (bzlib) and "2" (lzo1x) lack proper documentation on
the format, which limits implementation possibilities. Due to licensing conflict
s on commonly available libraries' compression methods, "2" (lzo1x) does not off
er widespread interoperability. A Matroska Writer <bcp14>SHOULD NOT</bcp14> use
these compression methods by default. A Matroska Reader <bcp14>MAY</bcp14> suppo
rt methods "1" and "2" as possible and <bcp14>SHOULD</bcp14> support other metho
ds.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t>
<table anchor="ContentCompAlgoValues"><name>ContentCompAlgo values</name> <table anchor="ContentCompAlgoValues"><name>ContentCompAlgo Values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
<td align="left">zlib</td> <td align="left">zlib</td>
<td align="left">zlib compression <xref target="RFC1950"></xref>.</td> <td align="left">zlib compression <xref target="RFC1950"></xref>.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">bzlib</td> <td align="left">bzlib</td>
<td align="left">bzip2 compression <xref target="BZIP2"></xref>, <bcp14>SHOULD N OT</bcp14> be used; see usage notes.</td> <td align="left">bzip2 compression <xref target="BZIP2"></xref> <bcp14>SHOULD NO T</bcp14> be used; see usage notes.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">lzo1x</td> <td align="left">lzo1x</td>
<td align="left">Lempel-Ziv-Oberhumer compression <xref target="LZO"></xref>, <b cp14>SHOULD NOT</bcp14> be used; see usage notes.</td> <td align="left">Lempel-Ziv-Oberhumer compression <xref target="LZO"></xref>, <b cp14>SHOULD NOT</bcp14> be used; see usage notes.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>3</tt></td> <td align="left"><tt>3</tt></td>
<td align="left">Header Stripping</td> <td align="left">Header Stripping</td>
<td align="left">Octets in <tt>ContentCompSettings</tt> (<xref target="contentco mpsettings-element"></xref>) have been stripped from each frame.</td> <td align="left">Octets in <tt>ContentCompSettings</tt> (<xref target="contentco mpsettings-element"></xref>) have been stripped from each frame.</td>
</tr> </tr>
</tbody> </tbody>
</table> </table>
<dl spacing="compact">
<dt>usage notes:</dt> <!-- [rfced] Please review "as possible" here. Is this phrase needed? If it is
<dd>Compression method &quot;1&quot; (bzlib) and &quot;2&quot; (lzo1x) are lacki needed, should it be updated to "if possible"?
ng proper documentation on the format which limits implementation possibilities.
Due to licensing conflicts on commonly available libraries compression methods & Original:
quot;2&quot; (lzo1x) does not offer widespread interoperability. A Matroska Reader MAY support methods "1" and "2" as possible, and
A Matroska Writer <bcp14>SHOULD NOT</bcp14> use these compression methods by def SHOULD support other methods.
ault.
A Matroska Reader <bcp14>MAY</bcp14> support methods &quot;1&quot; and &quot;2&q Perhaps (deleted "as possible"):
uot; as possible, and <bcp14>SHOULD</bcp14> support other methods.</dd> A Matroska Reader MAY support methods "1" and "2" and
</dl> SHOULD support other methods.
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
Or (use "if possible"):
A Matroska Reader MAY support methods "1" and "2" if possible and
SHOULD support other methods.
-->
</section> </section>
<section anchor="contentcompsettings-element"><name>ContentCompSettings Element< /name> <section anchor="contentcompsettings-element"><name>ContentCompSettings Element< /name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x4255 / binary</dd> <dd>0x4255 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentCompr ession\ContentCompSettings</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentCompr ession\ContentCompSettings</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Settings that might be needed by the decompressor. For Header Stripping (<tt >ContentCompAlgo</tt>=3), <dd>Settings that might be needed by the decompressor. For Header Stripping (<tt >ContentCompAlgo</tt>=3),
the bytes that were removed from the beginning of each frames of the track.</dd> the bytes that were removed from the beginning of each frame of the track.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="contentencryption-element"><name>ContentEncryption Element</nam e> <section anchor="contentencryption-element"><name>ContentEncryption Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x5035 / master</dd> <dd>0x5035 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Settings describing the encryption used. <dd>Settings describing the encryption used.
This Element <bcp14>MUST</bcp14> be present if the value of <tt>ContentEncodingT ype</tt> is 1 (encryption) and <bcp14>MUST</bcp14> be ignored otherwise. This Element <bcp14>MUST</bcp14> be present if the value of <tt>ContentEncodingT ype</tt> is 1 (encryption) and <bcp14>MUST</bcp14> be ignored otherwise.
A Matroska Player <bcp14>MAY</bcp14> support encryption.</dd> A Matroska Player <bcp14>MAY</bcp14> support encryption.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="contentencalgo-element"><name>ContentEncAlgo Element</name> <section anchor="contentencalgo-element"><name>ContentEncAlgo Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x47E1 / uinteger / 0</dd> <dd>0x47E1 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncAlgo</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncAlgo</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The encryption algorithm used.</dd> <dd>The encryption algorithm used.</dd>
<dt>defined values:</dt>
<dd>See <xref target="ContentEncAlgoValues"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t> <table anchor="ContentEncAlgoValues"><name>ContentEncAlgo Values</name>
<table anchor="ContentEncAlgoValues"><name>ContentEncAlgo values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
<td align="left">Not encrypted</td> <td align="left">Not encrypted</td>
<td align="left">The data are not encrypted.</td> <td align="left">The data are not encrypted.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">DES</td> <td align="left">DES</td>
<td align="left">Data Encryption Standard (DES) <xref target="FIPS.46-3"></xref> .This value <bcp14>SHOULD</bcp14> be avoided.</td> <td align="left">Data Encryption Standard (DES) <xref target="FIPS46-3"></xref>. This value <bcp14>SHOULD</bcp14> be avoided.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">3DES</td> <td align="left">3DES</td>
<td align="left">Triple Data Encryption Algorithm <xref target="SP.800-67"></xre f>.This value <bcp14>SHOULD</bcp14> be avoided.</td> <td align="left">Triple Data Encryption Algorithm <xref target="SP800-67"></xref >. This value <bcp14>SHOULD</bcp14> be avoided.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>3</tt></td> <td align="left"><tt>3</tt></td>
<td align="left">Twofish</td> <td align="left">Twofish</td>
<td align="left">Twofish Encryption Algorithm <xref target="Twofish"></xref>.</t d> <td align="left">Twofish Encryption Algorithm <xref target="Twofish"></xref>.</t d>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>4</tt></td> <td align="left"><tt>4</tt></td>
<td align="left">Blowfish</td> <td align="left">Blowfish</td>
<td align="left">Blowfish Encryption Algorithm <xref target="Blowfish"></xref>.T his value <bcp14>SHOULD</bcp14> be avoided.</td> <td align="left">Blowfish Encryption Algorithm <xref target="Blowfish"></xref>. This value <bcp14>SHOULD</bcp14> be avoided.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>5</tt></td> <td align="left"><tt>5</tt></td>
<td align="left">AES</td> <td align="left">AES</td>
<td align="left">Advanced Encryption Standard (AES) <xref target="FIPS.197"></xr ef>.</td> <td align="left">Advanced Encryption Standard (AES) <xref target="FIPS197"></xre f>.</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="contentenckeyid-element"><name>ContentEncKeyID Element</name> <section anchor="contentenckeyid-element"><name>ContentEncKeyID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x47E2 / binary</dd> <dd>0x47E2 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncKeyID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncKeyID</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>For public key algorithms this is the ID of the public key the data was encr <dd>For public key algorithms, the ID of the public key that the data was encryp
ypted with.</dd> ted with.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="contentencaessettings-element"><name>ContentEncAESSettings Elem ent</name> <section anchor="contentencaessettings-element"><name>ContentEncAESSettings Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x47E7 / master</dd> <dd>0x47E7 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncAESSettings</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncAESSettings</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Settings describing the encryption algorithm used.</dd> <dd>Settings describing the encryption algorithm used.</dd>
<dt>notes:</dt>
<dd>See <xref target="ContentEncAESSettingsNotes"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>notes:</t> <table anchor="ContentEncAESSettingsNotes"><name>ContentEncAESSettings Implement
<table anchor="ContentEncAESSettingsNotes"><name>ContentEncAESSettings implement ation Notes</name>
ation notes</name>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">maxOccurs</td> <td align="left">maxOccurs</td>
<td align="left">ContentEncAESSettings <bcp14>MUST NOT</bcp14> be set (maxOccurs =0) if ContentEncAlgo is not AES (5).</td> <td align="left">ContentEncAESSettings <bcp14>MUST NOT</bcp14> be set (maxOccurs =0) if ContentEncAlgo is not AES (5).</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
<section anchor="aessettingsciphermode-element"><name>AESSettingsCipherMode Elem ent</name> <section anchor="aessettingsciphermode-element"><name>AESSettingsCipherMode Elem ent</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x47E8 / uinteger</dd> <dd>0x47E8 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncAESSettings\AESSettingsCipherMode</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentEncAESSettings\AESSettingsCipherMode</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The AES cipher mode used in the encryption.</dd> <dd>The AES cipher mode used in the encryption.</dd>
<dt>defined values:</dt>
<dd>See <xref target="AESSettingsCipherModeValues"/>.</dd>
<dt>notes:</dt>
<dd>See <xref target="AESSettingsCipherModeNotes"/>.</dd>
<dt>stream copy:</dt>
<dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>defined values:</t> <table anchor="AESSettingsCipherModeValues"><name>AESSettingsCipherMode Values</
<table anchor="AESSettingsCipherModeValues"><name>AESSettingsCipherMode values</ name>
name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">AES-CTR</td> <td align="left">AES-CTR</td>
<td align="left">Counter <xref target="SP.800-38A"></xref>.</td> <td align="left">Counter <xref target="SP800-38A"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">AES-CBC</td> <td align="left">AES-CBC</td>
<td align="left">Cipher Block Chaining <xref target="SP.800-38A"></xref>.</td> <td align="left">Cipher Block Chaining <xref target="SP800-38A"></xref></td>
</tr> </tr>
</tbody> </tbody>
</table><t>notes:</t> </table>
<table anchor="AESSettingsCipherModeNotes"><name>AESSettingsCipherMode implement
ation notes</name> <table anchor="AESSettingsCipherModeNotes"><name>AESSettingsCipherMode Implement
ation Notes</name>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">maxOccurs</td> <td align="left">maxOccurs</td>
<td align="left">AESSettingsCipherMode <bcp14>MUST NOT</bcp14> be set (maxOccurs =0) if ContentEncAlgo is not AES (5).</td> <td align="left">AESSettingsCipherMode <bcp14>MUST NOT</bcp14> be set (maxOccurs =0) if ContentEncAlgo is not AES (5).</td>
</tr> </tr>
</tbody> </tbody>
</table><t>stream copy: True (<xref target="stream-copy"></xref>)</t> </table>
</section> </section>
</section> </section>
</section> </section>
</section> </section>
<section anchor="cues-element"><name>Cues Element</name> <section anchor="cues-element"><name>Cues Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x1C53BB6B / master</dd> <dd>0x1C53BB6B / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues</tt></dd> <dd><tt>\Segment\Cues</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>see implementation notes / 1</dd> <dd>see implementation notes / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A Top-Level Element to speed seeking access. <dd>A Top-Level Element to speed seeking access.
All entries are local to the Segment.</dd> All entries are local to the Segment.</dd>
<dt>notes:</dt>
<dd>See <xref target="CuesNotes"/>.</dd>
</dl> </dl>
<t>notes:</t> <table anchor="CuesNotes"><name>Cues Implementation Notes</name>
<table anchor="CuesNotes"><name>Cues implementation notes</name>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">minOccurs</td> <td align="left">minOccurs</td>
skipping to change at line 4119 skipping to change at line 4578
<section anchor="cuetrackpositions-element"><name>CueTrackPositions Element</nam e> <section anchor="cuetrackpositions-element"><name>CueTrackPositions Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xB7 / master</dd> <dd>0xB7 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint\CueTrackPositions</tt></dd> <dd><tt>\Segment\Cues\CuePoint\CueTrackPositions</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contain positions for different tracks corresponding to the timestamp.</dd> <dd>Contains positions for different tracks corresponding to the timestamp.</dd>
</dl> </dl>
<section anchor="cuetrack-element"><name>CueTrack Element</name> <section anchor="cuetrack-element"><name>CueTrack Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xF7 / uinteger</dd> <dd>0xF7 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 4181 skipping to change at line 4640
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xB2 / uinteger</dd> <dd>0xB2 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueDuration</tt></dd> <dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueDuration</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The duration of the block, expressed in Segment Ticks which is based on Time stampScale; see <xref target="timestamp-ticks"></xref>. <dd>The duration of the block, expressed in Segment Ticks, which are based on Ti mestampScale; see <xref target="timestamp-ticks"></xref>.
If missing, the track's DefaultDuration does not apply and no duration informati on is available in terms of the cues.</dd> If missing, the track's DefaultDuration does not apply and no duration informati on is available in terms of the cues.</dd>
</dl> </dl>
</section> </section>
<section anchor="cueblocknumber-element"><name>CueBlockNumber Element</name> <section anchor="cueblocknumber-element"><name>CueBlockNumber Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x5378 / uinteger</dd> <dd>0x5378 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
skipping to change at line 4262 skipping to change at line 4721
<section anchor="attachments-element"><name>Attachments Element</name> <section anchor="attachments-element"><name>Attachments Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x1941A469 / master</dd> <dd>0x1941A469 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments</tt></dd> <dd><tt>\Segment\Attachments</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contain attached files.</dd> <dd>Contains attached files.</dd>
</dl> </dl>
<section anchor="attachedfile-element"><name>AttachedFile Element</name> <section anchor="attachedfile-element"><name>AttachedFile Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x61A7 / master</dd> <dd>0x61A7 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments\AttachedFile</tt></dd> <dd><tt>\Segment\Attachments\AttachedFile</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
skipping to change at line 4316 skipping to change at line 4775
<section anchor="filemediatype-element"><name>FileMediaType Element</name> <section anchor="filemediatype-element"><name>FileMediaType Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x4660 / string</dd> <dd>0x4660 / string</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments\AttachedFile\FileMediaType</tt></dd> <dd><tt>\Segment\Attachments\AttachedFile\FileMediaType</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Media type of the file following the <xref target="RFC6838"></xref> format.< <dd>Media type of the file following the format described in <xref target="RFC68
/dd> 38"></xref>.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="filedata-element"><name>FileData Element</name> <section anchor="filedata-element"><name>FileData Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x465C / binary</dd> <dd>0x465C / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments\AttachedFile\FileData</tt></dd> <dd><tt>\Segment\Attachments\AttachedFile\FileData</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The data of the file.</dd> <dd>The data of the file.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="fileuid-element"><name>FileUID Element</name> <section anchor="fileuid-element"><name>FileUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x46AE / uinteger</dd> <dd>0x46AE / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments\AttachedFile\FileUID</tt></dd> <dd><tt>\Segment\Attachments\AttachedFile\FileUID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Unique ID representing the file, as random as possible.</dd> <dd>UID representing the file, as random as possible.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
</section> </section>
</section> </section>
<section anchor="chapters-element"><name>Chapters Element</name> <section anchor="chapters-element"><name>Chapters Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x1043A770 / master</dd> <dd>0x1043A770 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters</tt></dd> <dd><tt>\Segment\Chapters</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
</dl> <dt>recurring:</dt><dd>True</dd>
<t>recurring: True</t>
<dl spacing="compact">
<dt>definition:</dt> <dt>definition:</dt>
<dd>A system to define basic menus and partition data. <dd>A system to define basic menus and partition data.
For more detailed information, look at the Chapters explanation in <xref target= "chapters"></xref>.</dd> For more detailed information, see <xref target="chapters"></xref>.</dd>
</dl> </dl>
<section anchor="editionentry-element"><name>EditionEntry Element</name> <section anchor="editionentry-element"><name>EditionEntry Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x45B9 / master</dd> <dd>0x45B9 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
skipping to change at line 4398 skipping to change at line 4854
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x45BC / uinteger</dd> <dd>0x45BC / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\EditionUID</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\EditionUID</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID to identify the edition. It's useful for tagging an edition.</dd <dd>A UID to identify the edition. It's useful for tagging an edition.</dd>
> <dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="editionflagdefault-element"><name>EditionFlagDefault Element</n ame> <section anchor="editionflagdefault-element"><name>EditionFlagDefault Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x45DB / uinteger / 0</dd> <dd>0x45DB / uinteger / 0</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 4444 skipping to change at line 4900
<section anchor="chapteratom-element"><name>ChapterAtom Element</name> <section anchor="chapteratom-element"><name>ChapterAtom Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0xB6 / master</dd> <dd>0xB6 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
</dl> <dt>recursive:</dt><dd>True</dd>
<t>recursive: True</t>
<dl spacing="compact">
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains the atom information to use as the chapter atom (apply to all track s).</dd> <dd>Contains the atom information to use as the chapter atom (applies to all tra cks).</dd>
</dl> </dl>
<section anchor="chapteruid-element"><name>ChapterUID Element</name> <section anchor="chapteruid-element"><name>ChapterUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x73C4 / uinteger</dd> <dd>0x73C4 / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterUID</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterUID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID to identify the Chapter.</dd> <dd>A UID to identify the Chapter.</dd>
<dt>stream copy:</dt><dd>True (<xref target="stream-copy"></xref>)</dd>
</dl> </dl>
<t>stream copy: True (<xref target="stream-copy"></xref>)</t>
</section> </section>
<section anchor="chapterstringuid-element"><name>ChapterStringUID Element</name> <section anchor="chapterstringuid-element"><name>ChapterStringUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x5654 / utf-8</dd> <dd>0x5654 / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterStringUID</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterStringUID</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>3</dd> <dd>3</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique string ID to identify the Chapter. <dd>A unique string ID to identify the Chapter.
For example it is used as the storage for <xref target="WebVTT"></xref> cue iden tifier values.</dd> For example, it is used as the storage for cue identifier values <xref target="W ebVTT"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="chaptertimestart-element"><name>ChapterTimeStart Element</name> <section anchor="chaptertimestart-element"><name>ChapterTimeStart Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x91 / uinteger</dd> <dd>0x91 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterTimeStart</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterTimeStart</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Timestamp of the start of Chapter, expressed in Matroska Ticks -- i.e., in n anoseconds; see <xref target="timestamp-ticks"></xref>.</dd> <dd>Timestamp of the start of Chapter, expressed in Matroska Ticks -- i.e., in n anoseconds; see <xref target="timestamp-ticks"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="chaptertimeend-element"><name>ChapterTimeEnd Element</name> <section anchor="chaptertimeend-element"><name>ChapterTimeEnd Element</name>
<!-- [rfced] Please clarify "Timestamp of the end of Chapter timestamp
excluded".
Original:
definition: Timestamp of the end of Chapter timestamp excluded,
expressed in Matroska Ticks - i.e., in nanoseconds; see
Section 11.1.
-->
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x92 / uinteger</dd> <dd>0x92 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterTimeEnd</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterTimeEnd</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>see implementation notes / 1</dd> <dd>see implementation notes / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Timestamp of the end of Chapter timestamp excluded, expressed in Matroska Ti cks -- i.e., in nanoseconds; see <xref target="timestamp-ticks"></xref>. <dd>Timestamp of the end of Chapter timestamp excluded, expressed in Matroska Ti cks -- i.e., in nanoseconds; see <xref target="timestamp-ticks"></xref>.
The value <bcp14>MUST</bcp14> be greater than or equal to the <tt>ChapterTimeSta rt</tt> of the same <tt>ChapterAtom</tt>.</dd> The value <bcp14>MUST</bcp14> be greater than or equal to the <tt>ChapterTimeSta rt</tt> of the same <tt>ChapterAtom</tt>.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>The <tt>ChapterTimeEnd</tt> timestamp value being excluded, it <bcp14>MUST</ bcp14> take in account the duration of <dd>With the <tt>ChapterTimeEnd</tt> timestamp value being excluded, it <bcp14>M UST</bcp14> take into account the duration of
the last frame it includes, especially for the <tt>ChapterAtom</tt> using the la st frames of the <tt>Segment</tt>.</dd> the last frame it includes, especially for the <tt>ChapterAtom</tt> using the la st frames of the <tt>Segment</tt>.</dd>
<dt>notes:</dt>
<dd>See <xref target="ChapterTimeEndNotes"/>.</dd>
</dl> </dl>
<t>notes:</t> <table anchor="ChapterTimeEndNotes"><name>ChapterTimeEnd Implementation Notes</n
<table anchor="ChapterTimeEndNotes"><name>ChapterTimeEnd implementation notes</n ame>
ame>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">minOccurs</td> <td align="left">minOccurs</td>
<td align="left">ChapterTimeEnd <bcp14>MUST</bcp14> be set (minOccurs=1) if the Edition is an ordered edition; see <xref target="editionflagordered"></xref>, un less it's a <tt>Parent Chapter</tt>; see <xref target="nested-chapters"></xref>< /td> <td align="left">ChapterTimeEnd <bcp14>MUST</bcp14> be set (minOccurs=1) if the Edition is an ordered edition; see <xref target="editionflagordered"></xref>. If it's a <tt>Parent Chapter</tt>, see <xref target="nested-chapters"></xref>.</td >
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="chapterflaghidden-element"><name>ChapterFlagHidden Element</nam e> <section anchor="chapterflaghidden-element"><name>ChapterFlagHidden Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x98 / uinteger / 0</dd> <dd>0x98 / uinteger / 0</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>0-1</dd> <dd>0-1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterFlagHidden</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterFlagHidden</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Set to 1 if a chapter is hidden. Hidden chapters <bcp14>SHOULD NOT</bcp14> b <dd>Set to 1 if a chapter is hidden.
e available to the user interface
<!-- [rfced] How may we rephrase the parenthetical in the following sentence for
clarity?
Original:
Hidden chapters SHOULD NOT be available to the user interface (but
still to Control Tracks; see Section 20.2.5 on Chapter flags).
Perhaps:
Hidden chapters SHOULD NOT be available to the user interface (but
still be available to Control Tracks); see Section 20.2.5 on Chapter flags.
-->
Hidden chapters <bcp14>SHOULD NOT</bcp14> be available to the user interface
(but still to Control Tracks; see <xref target="chapterflaghidden"></xref> on Ch apter flags).</dd> (but still to Control Tracks; see <xref target="chapterflaghidden"></xref> on Ch apter flags).</dd>
</dl> </dl>
</section> </section>
<section anchor="chaptersegmentuuid-element"><name>ChapterSegmentUUID Element</n ame> <section anchor="chaptersegmentuuid-element"><name>ChapterSegmentUUID Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6E67 / binary</dd> <dd>0x6E67 / binary</dd>
<dt>length:</dt> <dt>length:</dt>
<dd>16</dd> <dd>16</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterSegmentUUID</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterSegmentUUID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>see implementation notes / 1</dd> <dd>see implementation notes / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The SegmentUUID of another Segment to play during this chapter.</dd> <dd>The SegmentUUID of another Segment to play during this chapter.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>The value <bcp14>MUST NOT</bcp14> be the <tt>SegmentUUID</tt> value of the < tt>Segment</tt> it belongs to.</dd> <dd>The value <bcp14>MUST NOT</bcp14> be the <tt>SegmentUUID</tt> value of the < tt>Segment</tt> it belongs to.</dd>
<dt>notes:</dt>
<dd>See <xref target="ChapterSegmentUUIDNotes"/>.</dd>
</dl> </dl>
<t>notes:</t> <table anchor="ChapterSegmentUUIDNotes"><name>ChapterSegmentUUID Implementation
<table anchor="ChapterSegmentUUIDNotes"><name>ChapterSegmentUUID implementation Notes</name>
notes</name>
<thead> <thead>
<tr> <tr>
<th align="left">attribute</th> <th align="left">attribute</th>
<th align="left">note</th> <th align="left">note</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">minOccurs</td> <td align="left">minOccurs</td>
<td align="left">ChapterSegmentUUID <bcp14>MUST</bcp14> be set (minOccurs=1) if ChapterSegmentEditionUID is used; see <xref target="medium-linking"></xref> on m edium-linking Segments.</td> <td align="left">ChapterSegmentUUID <bcp14>MUST</bcp14> be set (minOccurs=1) if ChapterSegmentEditionUID is used; see <xref target="medium-linking"></xref> on M edium-Linking Segments.</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="chaptersegmenteditionuid-element"><name>ChapterSegmentEditionUI D Element</name> <section anchor="chaptersegmenteditionuid-element"><name>ChapterSegmentEditionUI D Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6EBC / uinteger</dd> <dd>0x6EBC / uinteger</dd>
<dt>range:</dt> <dt>range:</dt>
<dd>not 0</dd> <dd>not 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterSegmentEditionUID</tt ></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterSegmentEditionUID</tt ></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The EditionUID to play from the Segment linked in ChapterSegmentUUID. <dd>The EditionUID to play from the Segment linked in ChapterSegmentUUID.
If ChapterSegmentEditionUID is undeclared, then no Edition of the linked Segment is used; see <xref target="medium-linking"></xref> on medium-linking Segments.< /dd> If ChapterSegmentEditionUID is undeclared, then no Edition of the linked Segment is used; see <xref target="medium-linking"></xref> on Medium-Linking Segments.< /dd>
</dl> </dl>
</section> </section>
<section anchor="chapterphysicalequiv-element"><name>ChapterPhysicalEquiv Elemen t</name> <section anchor="chapterphysicalequiv-element"><name>ChapterPhysicalEquiv Elemen t</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x63C3 / uinteger</dd> <dd>0x63C3 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterPhysicalEquiv</tt></d d> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterPhysicalEquiv</tt></d d>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specify the physical equivalent of this ChapterAtom like &quot;DVD&quot; (60 ) or &quot;SIDE&quot; (50); <dd>Specifies the physical equivalent of this ChapterAtom, e.g., "DVD" (60) or " SIDE" (50);
see <xref target="physical-types"></xref> for a complete list of values.</dd> see <xref target="physical-types"></xref> for a complete list of values.</dd>
</dl> </dl>
</section> </section>
<section anchor="chapterdisplay-element"><name>ChapterDisplay Element</name> <section anchor="chapterdisplay-element"><name>ChapterDisplay Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x80 / master</dd> <dd>0x80 / master</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 4668 skipping to change at line 5147
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x437D / string</dd> <dd>0x437D / string</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterDisplay\ChapLanguageB CP47</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapterDisplay\ChapLanguageB CP47</tt></dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A language corresponding to the ChapString, <dd>A language corresponding to the ChapString,
in the <xref target="BCP47"></xref> form; see <xref target="language-codes"></xr ef> on language codes. in the form defined in <xref target="RFC5646"></xref>; see <xref target="languag e-codes"></xref> on language codes.
If a ChapLanguageBCP47 Element is used, then any ChapLanguage and ChapCountry El ements used in the same ChapterDisplay <bcp14>MUST</bcp14> be ignored.</dd> If a ChapLanguageBCP47 Element is used, then any ChapLanguage and ChapCountry El ements used in the same ChapterDisplay <bcp14>MUST</bcp14> be ignored.</dd>
</dl> </dl>
</section> </section>
<section anchor="chapcountry-element"><name>ChapCountry Element</name> <section anchor="chapcountry-element"><name>ChapCountry Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x437E / string</dd> <dd>0x437E / string</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 4701 skipping to change at line 5180
<dd>0x6944 / master</dd> <dd>0x6944 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains all the commands associated to the Atom.</dd> <dd>Contains all the commands associated to the Atom.</dd>
</dl> </dl>
</section> </section>
<section anchor="chapprocesscodecid-element"><name>ChapProcessCodecID Element</n ame> <section anchor="chapprocesscodecid-element"><name>ChapProcessCodecID Element</n ame>
<!-- [rfced] We have two questions about the definition below:
a) Does "to be defined" need further clarification, perhaps "to be defined in
future specifications"?
b) Section 20.3 defines value 0 as "matroska script" and value 1 as "menu
borrowed from the DVD [DVD-Video]". Should the definitions match? Or is the
current okay?
Original:
definition: Contains the type of the codec used for the processing.
A value of 0 means built-in Matroska processing (to be defined), a
value of 1 means the DVD command set is used; see Section 20.3 on
DVD menus.
-->
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x6955 / uinteger / 0</dd> <dd>0x6955 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessCodec ID</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessCodec ID</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains the type of the codec used for the processing. <dd>Contains the type of the codec used for processing.
A value of 0 means built-in Matroska processing (to be defined), a value of 1 me A value of 0 means built-in Matroska processing (to be defined), and a value of
ans the DVD command set is used; see <xref target="menu-features"></xref> on DVD 1 means the DVD command set is used; see <xref target="menu-features"></xref> on
menus. DVD menus.
More codec IDs can be added later.</dd> More codec IDs can be added later.</dd>
</dl> </dl>
</section> </section>
<section anchor="chapprocessprivate-element"><name>ChapProcessPrivate Element</n ame> <section anchor="chapprocessprivate-element"><name>ChapProcessPrivate Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x450D / binary</dd> <dd>0x450D / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessPriva te</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessPriva te</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Some optional data attached to the ChapProcessCodecID information. <dd>Optional data attached to the ChapProcessCodecID information.
For ChapProcessCodecID = 1, it is the &quot;DVD level&quot; equivalent; see <xre For ChapProcessCodecID = 1, it is the "DVD level" equivalent; see <xref target="
f target="menu-features"></xref> on DVD menus.</dd> menu-features"></xref> on DVD menus.</dd>
</dl> </dl>
</section> </section>
<section anchor="chapprocesscommand-element"><name>ChapProcessCommand Element</n ame> <section anchor="chapprocesscommand-element"><name>ChapProcessCommand Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6911 / master</dd> <dd>0x6911 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessComma nd</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessComma nd</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains all the commands associated to the Atom.</dd> <dd>Contains all the commands associated with the Atom.</dd>
</dl> </dl>
</section> </section>
<section anchor="chapprocesstime-element"><name>ChapProcessTime Element</name> <section anchor="chapprocesstime-element"><name>ChapProcessTime Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6922 / uinteger</dd> <dd>0x6922 / uinteger</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessComma nd\ChapProcessTime</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessComma nd\ChapProcessTime</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Defines when the process command <bcp14>SHOULD</bcp14> be handled</dd> <dd>Defines when the process command <bcp14>SHOULD</bcp14> be handled.</dd>
<dt>restrictions:</dt>
<dd>See <xref target="ChapProcessTimeValues"/>.</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="ChapProcessTimeValues"><name>ChapProcessTime Values</name>
<table anchor="ChapProcessTimeValues"><name>ChapProcessTime values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>0</tt></td> <td align="left"><tt>0</tt></td>
skipping to change at line 4779 skipping to change at line 5275
<tr> <tr>
<td align="left"><tt>1</tt></td> <td align="left"><tt>1</tt></td>
<td align="left">before starting playback</td> <td align="left">before starting playback</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>2</tt></td> <td align="left"><tt>2</tt></td>
<td align="left">after playback of the chapter</td> <td align="left">after playback of the chapter</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="chapprocessdata-element"><name>ChapProcessData Element</name> <section anchor="chapprocessdata-element"><name>ChapProcessData Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x6933 / binary</dd> <dd>0x6933 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessComma nd\ChapProcessData</tt></dd> <dd><tt>\Segment\Chapters\EditionEntry\+ChapterAtom\ChapProcess\ChapProcessComma nd\ChapProcessData</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
skipping to change at line 4809 skipping to change at line 5306
<section anchor="tags-element"><name>Tags Element</name> <section anchor="tags-element"><name>Tags Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x1254C367 / master</dd> <dd>0x1254C367 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags</tt></dd> <dd><tt>\Segment\Tags</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Element containing metadata describing Tracks, Editions, Chapters, Attachmen ts, or the Segment as a whole. <dd>Element containing metadata describing Tracks, Editions, Chapters, Attachmen ts, or the Segment as a whole.
A list of valid tags can be found in <xref target="MatroskaTags"></xref>.</dd> A list of valid tags can be found in <xref target="I-D.ietf-cellar-tags"></xref> .</dd>
</dl> </dl>
<section anchor="tag-element"><name>Tag Element</name> <section anchor="tag-element"><name>Tag Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x7373 / master</dd> <dd>0x7373 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag</tt></dd> <dd><tt>\Segment\Tags\Tag</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
skipping to change at line 4850 skipping to change at line 5347
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x68CA / uinteger / 50</dd> <dd>0x68CA / uinteger / 50</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\Targets\TargetTypeValue</tt></dd> <dd><tt>\Segment\Tags\Tag\Targets\TargetTypeValue</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A number to indicate the logical level of the target.</dd> <dd>A number to indicate the logical level of the target.</dd>
<dt>defined values:</dt>
<dd>See <xref target="TargetTypeValueValues"/>.</dd>
</dl> </dl>
<t>defined values:</t> <table anchor="TargetTypeValueValues"><name>TargetTypeValue Values</name>
<table anchor="TargetTypeValueValues"><name>TargetTypeValue values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
<th align="left">definition</th> <th align="left">definition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 4877 skipping to change at line 5375
<tr> <tr>
<td align="left"><tt>60</tt></td> <td align="left"><tt>60</tt></td>
<td align="left">EDITION / ISSUE / VOLUME / OPUS / SEASON / SEQUEL</td> <td align="left">EDITION / ISSUE / VOLUME / OPUS / SEASON / SEQUEL</td>
<td align="left">A list of lower levels grouped together.</td> <td align="left">A list of lower levels grouped together.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>50</tt></td> <td align="left"><tt>50</tt></td>
<td align="left">ALBUM / OPERA / CONCERT / MOVIE / EPISODE</td> <td align="left">ALBUM / OPERA / CONCERT / MOVIE / EPISODE</td>
<td align="left">The most common grouping level of music and video (equals to an episode for TV series).</td> <td align="left">The most common grouping level of music and video (e.g., an epi sode for TV series).</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>40</tt></td> <td align="left"><tt>40</tt></td>
<td align="left">PART / SESSION</td> <td align="left">PART / SESSION</td>
<td align="left">When an album or episode has different logical parts.</td> <td align="left">When an album or episode has different logical parts.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>30</tt></td> <td align="left"><tt>30</tt></td>
<td align="left">TRACK / SONG / CHAPTER</td> <td align="left">TRACK / SONG / CHAPTER</td>
<td align="left">The common parts of an album or movie.</td> <td align="left">The common parts of an album or movie.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>20</tt></td> <td align="left"><tt>20</tt></td>
<td align="left">SUBTRACK / MOVEMENT / SCENE</td> <td align="left">SUBTRACK / MOVEMENT / SCENE</td>
<td align="left">Corresponds to parts of a track for audio like a movement, or a scene in a movie.</td> <td align="left">Corresponds to parts of a track for audio, such as a movement o r scene in a movie.</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>10</tt></td> <td align="left"><tt>10</tt></td>
<td align="left">SHOT</td> <td align="left">SHOT</td>
<td align="left">The lowest hierarchy found in music or movies.</td> <td align="left">The lowest hierarchy found in music or movies.</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="targettype-element"><name>TargetType Element</name> <section anchor="targettype-element"><name>TargetType Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x63CA / string</dd> <dd>0x63CA / string</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\Targets\TargetType</tt></dd> <dd><tt>\Segment\Tags\Tag\Targets\TargetType</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>An informational string that can be used to display the logical level of the <dd>An informational string that can be used to display the logical level of the
target like &quot;ALBUM&quot;, &quot;TRACK&quot;, &quot;MOVIE&quot;, &quot;CHAP target, such as "ALBUM", "TRACK", "MOVIE", "CHAPTER", etc.</dd>
TER&quot;, etc.</dd> <dt>restrictions:</dt>
<dd>See <xref target="TargetTypeValues"/>.</dd>
</dl> </dl>
<t>restrictions:</t> <table anchor="TargetTypeValues"><name>TargetType Values</name>
<table anchor="TargetTypeValues"><name>TargetType values</name>
<thead> <thead>
<tr> <tr>
<th align="left">value</th> <th align="left">value</th>
<th align="left">label</th> <th align="left">label</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left"><tt>COLLECTION</tt></td> <td align="left"><tt>COLLECTION</tt></td>
skipping to change at line 5033 skipping to change at line 5533
<tr> <tr>
<td align="left"><tt>SCENE</tt></td> <td align="left"><tt>SCENE</tt></td>
<td align="left">TargetTypeValue 20</td> <td align="left">TargetTypeValue 20</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>SHOT</tt></td> <td align="left"><tt>SHOT</tt></td>
<td align="left">TargetTypeValue 10</td> <td align="left">TargetTypeValue 10</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table>
</section>
<section anchor="tagtrackuid-element"><name>TagTrackUID Element</name> <section anchor="tagtrackuid-element"><name>TagTrackUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x63C5 / uinteger / 0</dd> <dd>0x63C5 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\Targets\TagTrackUID</tt></dd> <dd><tt>\Segment\Tags\Tag\Targets\TagTrackUID</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID to identify the Track(s) the tags belong to.</dd> <dd>A UID to identify the Track(s) that the tags belong to.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the value is 0 at this level, the tags apply to all tracks in the Segment . <dd>If the value is 0 at this level, the tags apply to all tracks in the Segment .
If set to any other value, it <bcp14>MUST</bcp14> match the <tt>TrackUID</tt> va lue of a track found in this Segment.</dd> If set to any other value, it <bcp14>MUST</bcp14> match the <tt>TrackUID</tt> va lue of a track found in this Segment.</dd>
</dl> </dl>
</section> </section>
<section anchor="tageditionuid-element"><name>TagEditionUID Element</name> <section anchor="tageditionuid-element"><name>TagEditionUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x63C9 / uinteger / 0</dd> <dd>0x63C9 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\Targets\TagEditionUID</tt></dd> <dd><tt>\Segment\Tags\Tag\Targets\TagEditionUID</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID to identify the EditionEntry(s) the tags belong to.</dd> <dd>A UID to identify the EditionEntry(s) that the tags belong to.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the value is 0 at this level, the tags apply to all editions in the Segme nt. <dd>If the value is 0 at this level, the tags apply to all editions in the Segme nt.
If set to any other value, it <bcp14>MUST</bcp14> match the <tt>EditionUID</tt> value of an edition found in this Segment.</dd> If set to any other value, it <bcp14>MUST</bcp14> match the <tt>EditionUID</tt> value of an edition found in this Segment.</dd>
</dl> </dl>
</section> </section>
<section anchor="tagchapteruid-element"><name>TagChapterUID Element</name> <section anchor="tagchapteruid-element"><name>TagChapterUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x63C4 / uinteger / 0</dd> <dd>0x63C4 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\Targets\TagChapterUID</tt></dd> <dd><tt>\Segment\Tags\Tag\Targets\TagChapterUID</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID to identify the Chapter(s) the tags belong to.</dd> <dd>A UID to identify the Chapter(s) that the tags belong to.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the value is 0 at this level, the tags apply to all chapters in the Segme nt. <dd>If the value is 0 at this level, the tags apply to all chapters in the Segme nt.
If set to any other value, it <bcp14>MUST</bcp14> match the <tt>ChapterUID</tt> value of a chapter found in this Segment.</dd> If set to any other value, it <bcp14>MUST</bcp14> match the <tt>ChapterUID</tt> value of a chapter found in this Segment.</dd>
</dl> </dl>
</section> </section>
<section anchor="tagattachmentuid-element"><name>TagAttachmentUID Element</name> <section anchor="tagattachmentuid-element"><name>TagAttachmentUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x63C6 / uinteger / 0</dd> <dd>0x63C6 / uinteger / 0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\Targets\TagAttachmentUID</tt></dd> <dd><tt>\Segment\Tags\Tag\Targets\TagAttachmentUID</tt></dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>A unique ID to identify the Attachment(s) the tags belong to.</dd> <dd>A UID to identify the Attachment(s) that the tags belong to.</dd>
<dt>usage notes:</dt> <dt>usage notes:</dt>
<dd>If the value is 0 at this level, the tags apply to all the attachments in th e Segment. <dd>If the value is 0 at this level, the tags apply to all the attachments in th e Segment.
If set to any other value, it <bcp14>MUST</bcp14> match the <tt>FileUID</tt> val ue of an attachment found in this Segment.</dd> If set to any other value, it <bcp14>MUST</bcp14> match the <tt>FileUID</tt> val ue of an attachment found in this Segment.</dd>
</dl> </dl>
</section> </section>
</section> </section>
<section anchor="simpletag-element"><name>SimpleTag Element</name> <section anchor="simpletag-element"><name>SimpleTag Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x67C8 / master</dd> <dd>0x67C8 / master</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\+SimpleTag</tt></dd> <dd><tt>\Segment\Tags\Tag\+SimpleTag</tt></dd>
<dt>minOccurs:</dt> <dt>minOccurs:</dt>
<dd>1</dd> <dd>1</dd>
</dl> <dt>recursive:</dt><dd>True</dd>
<t>recursive: True</t>
<dl spacing="compact">
<dt>definition:</dt> <dt>definition:</dt>
<dd>Contains general information about the target.</dd> <dd>Contains general information about the target.</dd>
</dl> </dl>
<section anchor="tagname-element"><name>TagName Element</name> <section anchor="tagname-element"><name>TagName Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x45A3 / utf-8</dd> <dd>0x45A3 / utf-8</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 5137 skipping to change at line 5635
<section anchor="taglanguage-element"><name>TagLanguage Element</name> <section anchor="taglanguage-element"><name>TagLanguage Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x447A / string / und</dd> <dd>0x447A / string / und</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\+SimpleTag\TagLanguage</tt></dd> <dd><tt>\Segment\Tags\Tag\+SimpleTag\TagLanguage</tt></dd>
<dt>minOccurs / maxOccurs:</dt> <dt>minOccurs / maxOccurs:</dt>
<dd>1 / 1</dd> <dd>1 / 1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>Specifies the language of the tag specified, <dd>Specifies the language of the specified tag in the Matroska languages form;
in the Matroska languages form; see <xref target="language-codes"></xref> on lan see <xref target="language-codes"></xref> on language codes.
guage codes.
This Element <bcp14>MUST</bcp14> be ignored if the TagLanguageBCP47 Element is u sed within the same SimpleTag Element.</dd> This Element <bcp14>MUST</bcp14> be ignored if the TagLanguageBCP47 Element is u sed within the same SimpleTag Element.</dd>
</dl> </dl>
</section> </section>
<section anchor="taglanguagebcp47-element"><name>TagLanguageBCP47 Element</name> <section anchor="taglanguagebcp47-element"><name>TagLanguageBCP47 Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x447B / string</dd> <dd>0x447B / string</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\+SimpleTag\TagLanguageBCP47</tt></dd> <dd><tt>\Segment\Tags\Tag\+SimpleTag\TagLanguageBCP47</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>minver:</dt> <dt>minver:</dt>
<dd>4</dd> <dd>4</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The language used in the TagString, <dd>The language used in the TagString,
in the <xref target="BCP47"></xref> form; see <xref target="language-codes"></xr ef> on language codes. in the form defined in <xref target="RFC5646"></xref>; see <xref target="languag e-codes"></xref> on language codes.
If this Element is used, then any TagLanguage Elements used in the same SimpleTa g <bcp14>MUST</bcp14> be ignored.</dd> If this Element is used, then any TagLanguage Elements used in the same SimpleTa g <bcp14>MUST</bcp14> be ignored.</dd>
</dl> </dl>
</section> </section>
<section anchor="tagdefault-element"><name>TagDefault Element</name> <section anchor="tagdefault-element"><name>TagDefault Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type / default:</dt> <dt>id / type / default:</dt>
<dd>0x4484 / uinteger / 1</dd> <dd>0x4484 / uinteger / 1</dd>
<dt>range:</dt> <dt>range:</dt>
skipping to change at line 5201 skipping to change at line 5698
<section anchor="tagbinary-element"><name>TagBinary Element</name> <section anchor="tagbinary-element"><name>TagBinary Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>id / type:</dt> <dt>id / type:</dt>
<dd>0x4485 / binary</dd> <dd>0x4485 / binary</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\+SimpleTag\TagBinary</tt></dd> <dd><tt>\Segment\Tags\Tag\+SimpleTag\TagBinary</tt></dd>
<dt>maxOccurs:</dt> <dt>maxOccurs:</dt>
<dd>1</dd> <dd>1</dd>
<dt>definition:</dt> <dt>definition:</dt>
<dd>The values of the Tag, if it is binary. Note that this cannot be used in the same SimpleTag as TagString.</dd> <dd>The values of the Tag if it is binary. Note that this cannot be used in the same SimpleTag as TagString.</dd>
</dl> </dl>
</section> </section>
</section> </section>
</section> </section>
</section> </section>
</section> </section>
</section> </section>
<section anchor="matroska-element-ordering"><name>Matroska Element Ordering</nam e> <section anchor="matroska-element-ordering"><name>Matroska Element Ordering</nam e>
<t>Except for the <tt>EBML Header</tt> and the <tt>CRC-32 Element</tt>, the EBML <t>With the exceptions of the <tt>EBML Header</tt> and the <tt>CRC-32 Element</t
specification does not t>, the EBML specification <xref target="RFC8794"></xref> does not
require any particular storage order for <tt>Elements</tt>. This specification h require any particular storage order for <tt>Elements</tt>.
owever However, this specification defines mandates and recommendations for ordering
defines mandates and recommendations for ordering certain <tt>Elements</tt> in o certain <tt>Elements</tt> to facilitate better playback, seeking, and editing
rder to facilitate efficiency. This section describes and offers rationale for ordering
better playback, seeking, and editing efficiency. This section describes and off requirements and recommendations for Matroska.</t>
ers
rationale for ordering requirements and recommendations for Matroska.</t>
<section anchor="top-level-elements"><name>Top-Level Elements</name> <section anchor="top-level-elements"><name>Top-Level Elements</name>
<t>The <tt>Info Element</tt> is the only <bcp14>REQUIRED</bcp14> <tt>Top-Level E lement</tt> in a Matroska file. <t>The <tt>Info Element</tt> is the only <bcp14>REQUIRED</bcp14> <tt>Top-Level E lement</tt> in a Matroska file.
To be playable, Matroska <bcp14>MUST</bcp14> also contain at least one <tt>Track s Element</tt> and <tt>Cluster Element</tt>. To be playable, Matroska <bcp14>MUST</bcp14> also contain at least one <tt>Track s Element</tt> and <tt>Cluster Element</tt>.
The first <tt>Info Element</tt> and the first <tt>Tracks Element</tt> <bcp14>MUS The first <tt>Info Element</tt> and the first <tt>Tracks Element</tt> either <bc
T</bcp14> either be stored before the first p14>MUST</bcp14> be stored before the first
<tt>Cluster Element</tt> or both <bcp14>SHALL</bcp14> be referenced by a <tt>See <tt>Cluster Element</tt> or <bcp14>SHALL</bcp14> both be referenced by a <tt>See
kHead Element</tt> occurring before the first <tt>Cluster Element</tt>.</t> kHead Element</tt> occurring before the first <tt>Cluster Element</tt>.</t>
<t>All <tt>Top-Level Elements</tt> <bcp14>MUST</bcp14> use a 4-octet long EBML E <t>All <tt>Top-Level Elements</tt> <bcp14>MUST</bcp14> use a 4-octet EBML Elemen
lement ID.</t> t ID.</t>
<t>When using Medium Linking, chapters are used to reference other Segments to p <t>When using Medium Linking, chapters are used to reference other Segments to p
lay in a given order <xref target="medium-linking"></xref>. lay in a given order (see <xref target="medium-linking"></xref>).
A Segment containing these linked Chapters does not require a <tt>Track</tt> Ele A Segment containing these Linked Chapters does not require a <tt>Track</tt> Ele
ment or a <tt>Cluster</tt> Element.</t> ment or a <tt>Cluster</tt> Element.</t>
<t>It is possible to edit a Matroska file after it has been created. For example , chapters, <t>It is possible to edit a Matroska file after it has been created. For example , chapters,
tags, or attachments can be added. When new <tt>Top-Level Elements</tt> are adde d to a Matroska file, tags, or attachments can be added. When new <tt>Top-Level Elements</tt> are adde d to a Matroska file,
the <tt>SeekHead</tt> Element(s) <bcp14>MUST</bcp14> be updated so that the <tt> SeekHead</tt> Element(s) itemize the <tt>SeekHead</tt> Element(s) <bcp14>MUST</bcp14> be updated so that the <tt> SeekHead</tt> Element(s) itemizes
the identity and position of all <tt>Top-Level Elements</tt>.</t> the identity and position of all <tt>Top-Level Elements</tt>.</t>
<t>Editing, removing, or adding <t>Editing, removing, or adding
<tt>Elements</tt> to a Matroska file often requires that some existing <tt>Eleme nts</tt> be voided <tt>Elements</tt> to a Matroska file often requires that some existing <tt>Eleme nts</tt> be voided
or extended. or extended.
Transforming the existing <tt>Elements</tt> into <tt>Void Elements</tt> as paddi ng can be used Transforming the existing <tt>Elements</tt> into <tt>Void Elements</tt> as paddi ng can be used
as a method to avoid moving large amounts of data around.</t> as a method to avoid moving large amounts of data around.</t>
</section> </section>
<section anchor="crc-32"><name>CRC-32</name> <section anchor="crc-32"><name>CRC-32</name>
<t>As noted by the EBML specification, if a <tt>CRC-32 Element</tt> is used, the n the <tt>CRC-32 Element</tt> <t>As noted by the EBML specification <xref target="RFC8794"></xref>, if a <tt>C RC-32 Element</tt> is used, then the <tt>CRC-32 Element</tt>
<bcp14>MUST</bcp14> be the first ordered <tt>Element</tt> within its <tt>Parent Element</tt>.</t> <bcp14>MUST</bcp14> be the first ordered <tt>Element</tt> within its <tt>Parent Element</tt>.</t>
<t>In Matroska all <tt>Top-Level Elements</tt> of an EBML Document <bcp14>SHOULD </bcp14> include a <tt>CRC-32 Element</tt> <t>In Matroska, all <tt>Top-Level Elements</tt> of an EBML Document <bcp14>SHOUL D</bcp14> include a <tt>CRC-32 Element</tt>
as their first <tt>Child Element</tt>. as their first <tt>Child Element</tt>.
The <tt>Segment Element</tt>, which is the <tt>Root Element</tt>, <bcp14>SHOULD NOT</bcp14> have a <tt>CRC-32 Element</tt>.</t> The <tt>Segment Element</tt>, which is the <tt>Root Element</tt>, <bcp14>SHOULD NOT</bcp14> have a <tt>CRC-32 Element</tt>.</t>
</section> </section>
<section anchor="seekhead"><name>SeekHead</name> <section anchor="seekhead"><name>SeekHead</name>
<t>If used, the first <tt>SeekHead Element</tt> <bcp14>MUST</bcp14> be the first non-<tt>CRC-32 Child Element</tt> <t>If used, the first <tt>SeekHead Element</tt> <bcp14>MUST</bcp14> be the first non-<tt>CRC-32 Child Element</tt>
of the <tt>Segment Element</tt>. If a second <tt>SeekHead Element</tt> is used, then the first of the <tt>Segment Element</tt>. If a second <tt>SeekHead Element</tt> is used, then the first
<tt>SeekHead Element</tt> <bcp14>MUST</bcp14> reference the identity and positio n of the second <tt>SeekHead</tt>.</t> <tt>SeekHead Element</tt> <bcp14>MUST</bcp14> reference the identity and positio n of the second <tt>SeekHead Element</tt>.</t>
<t>Additionally, the second <tt>SeekHead Element</tt> <bcp14>MUST</bcp14> only r eference <tt>Cluster</tt> Elements <t>Additionally, the second <tt>SeekHead Element</tt> <bcp14>MUST</bcp14> only r eference <tt>Cluster</tt> Elements
and not any other <tt>Top-Level Element</tt> already contained within the first <tt>SeekHead Element</tt>.</t> and not any other <tt>Top-Level Element</tt> already contained within the first <tt>SeekHead Element</tt>.</t>
<t>The second <tt>SeekHead Element</tt> <bcp14>MAY</bcp14> be stored in any orde r relative to the other <tt>Top-Level Elements</tt>. <t>The second <tt>SeekHead Element</tt> <bcp14>MAY</bcp14> be stored in any orde r relative to the other <tt>Top-Level Elements</tt>.
Whether one or two <tt>SeekHead Element(s)</tt> are used, the <tt>SeekHead Eleme nt(s)</tt> <bcp14>MUST</bcp14> Whether one or two <tt>SeekHead Elements</tt> are used, the <tt>SeekHead Element (s)</tt> <bcp14>MUST</bcp14>
collectively reference the identity and position of all <tt>Top-Level Elements</ tt> except collectively reference the identity and position of all <tt>Top-Level Elements</ tt> except
for the first <tt>SeekHead Element</tt>.</t> for the first <tt>SeekHead Element</tt>.</t>
</section> </section>
<section anchor="cues-index"><name>Cues (index)</name> <section anchor="cues-index"><name>Cues (Index)</name>
<t>The <tt>Cues Element</tt> is <bcp14>RECOMMENDED</bcp14> to optimize seeking a ccess in Matroska. It is <t>The <tt>Cues Element</tt> is <bcp14>RECOMMENDED</bcp14> to optimize seeking a ccess in Matroska. It is
programmatically simpler to add the <tt>Cues Element</tt> after all <tt>Cluster Elements</tt> programmatically simpler to add the <tt>Cues Element</tt> after all <tt>Cluster Elements</tt>
have been written because this does not require a prediction of how much space t o have been written because this does not require a prediction of how much space t o
reserve before writing the <tt>Cluster Elements</tt>. However, storing the <tt>C ues Element</tt> reserve before writing the <tt>Cluster Elements</tt>. However, storing the <tt>C ues Element</tt>
before the <tt>Cluster Elements</tt> can provide some seeking advantages. If the <tt>Cues Element</tt> before the <tt>Cluster Elements</tt> can provide some seeking advantages. If the <tt>Cues Element</tt>
is present, then it <bcp14>SHOULD</bcp14> either be stored before the first <tt> Cluster Element</tt> is present, then it <bcp14>SHOULD</bcp14> either be stored before the first <tt> Cluster Element</tt>
or be referenced by a <tt>SeekHead Element</tt>.</t> or be referenced by a <tt>SeekHead Element</tt>.</t>
</section> </section>
<section anchor="info"><name>Info</name> <section anchor="info"><name>Info</name>
<t>The first <tt>Info Element</tt> <bcp14>SHOULD</bcp14> occur before the first <tt>Tracks Element</tt> and first <t>The first <tt>Info Element</tt> <bcp14>SHOULD</bcp14> occur before the first <tt>Tracks Element</tt> and first
<tt>Cluster Element</tt> except when referenced by a <tt>SeekHead Element</tt>.< /t> <tt>Cluster Element</tt> except when referenced by a <tt>SeekHead Element</tt>.< /t>
</section> </section>
<section anchor="chapters-element-1"><name>Chapters Element</name> <section anchor="chapters-element-1"><name>Chapters Element</name>
<t>The <tt>Chapters Element</tt> <bcp14>SHOULD</bcp14> be placed before the <tt> Cluster Element(s)</tt>. The <t>The <tt>Chapters Element</tt> <bcp14>SHOULD</bcp14> be placed before the <tt> Cluster Element(s)</tt>. The
<tt>Chapters Element</tt> can be used during playback even if the user does not need to seek. <tt>Chapters Element</tt> can be used during playback even if the user does not need to seek.
It immediately gives the user information about what section is being read and w hat It immediately gives the user information about what section is being read and w hat
other sections are available. In the case of Ordered Chapters it is <bcp14>RECOM other sections are available.
MENDED</bcp14> to evaluate
the logical linking even before playing. The <tt>Chapters Element</tt> <bcp14>SH In the case of Ordered Chapters, it is <bcp14>RECOMMENDED</bcp14> to evaluate
OULD</bcp14> be placed before the logical linking before playing. The <tt>Chapters Element</tt> <bcp14>SHOULD<
/bcp14> be placed before
the first <tt>Tracks Element</tt> and after the first <tt>Info Element</tt>.</t> the first <tt>Tracks Element</tt> and after the first <tt>Info Element</tt>.</t>
</section> </section>
<section anchor="attachments"><name>Attachments</name> <section anchor="attachments"><name>Attachments</name>
<t>The <tt>Attachments Element</tt> is not intended to be used by default when p laying the file, <t>The <tt>Attachments Element</tt> is not intended to be used by default when p laying the file
but could contain information relevant to the content, such as cover art or font s. but could contain information relevant to the content, such as cover art or font s.
Cover art is useful even before the file is played and fonts could be needed bef Cover art is useful even before the file is played, and fonts could be needed be
ore playback fore playback
starts for initialization of subtitles. The <tt>Attachments Element</tt> <bcp14> starts for the initialization of subtitles. The <tt>Attachments Element</tt> <bc
MAY</bcp14> be placed before p14>MAY</bcp14> be placed before
the first <tt>Cluster Element</tt>; however, if the <tt>Attachments Element</tt> is likely to be edited, the first <tt>Cluster Element</tt>; however, if the <tt>Attachments Element</tt> is likely to be edited,
then it <bcp14>SHOULD</bcp14> be placed after the last <tt>Cluster Element</tt>. </t> then it <bcp14>SHOULD</bcp14> be placed after the last <tt>Cluster Element</tt>. </t>
</section> </section>
<section anchor="tags"><name>Tags</name> <section anchor="tags"><name>Tags</name>
<t>The <tt>Tags Element</tt> is most subject to changes after the file was origi nally created. <t>The <tt>Tags Element</tt> is most subject to changes after the file was origi nally created.
For easier editing, the <tt>Tags Element</tt> can be placed at the end of the <t t>Segment Element</tt>, For easier editing, the <tt>Tags Element</tt> can be placed at the end of the <t t>Segment Element</tt>,
even after the <tt>Attachments Element</tt>. On the other hand, it is inconvenie nt to have to even after the <tt>Attachments Element</tt>. On the other hand, it is inconvenie nt to have to
seek in the <tt>Segment</tt> for tags, especially for network streams. So it's b etter if the seek in the <tt>Segment</tt> for tags, especially for network streams; thus, it' s better if the
<tt>Tags Element</tt> is found early in the stream. When editing the <tt>Tags El ement</tt>, the original <tt>Tags Element</tt> is found early in the stream. When editing the <tt>Tags El ement</tt>, the original
<tt>Tags Element</tt> at the beginning can be overwritten with a <tt>Void Elemen t</tt> and a <tt>Tags Element</tt> at the beginning can be overwritten with a <tt>Void Elemen t</tt> and a
new <tt>Tags Element</tt> written at the end of the <tt>Segment Element</tt>. Th e file and Segment sizes will only marginally change.</t> new <tt>Tags Element</tt> written at the end of the <tt>Segment Element</tt>. Th e file and Segment sizes will only marginally change.</t>
</section> </section>
</section> </section>
<section anchor="matroska-versioning"><name>Matroska versioning</name> <section anchor="matroska-versioning"><name>Matroska Versioning</name>
<t>Matroska is based upon the principle that a reading application does not have <t>Matroska is based on the principle that a reading application does not have t
to support o support
100% of the specifications in order to be able to play the file. A Matroska file 100% of the specifications in order to be able to play the file. Therefore, a Ma
therefore troska file contains version indicators that tell a reading application what to
contains version indicators that tell a reading application what to expect.</t> expect.</t>
<t>It is possible and valid to have the version fields indicate that the file co ntains <t>It is possible and valid to have the version fields indicate that the file co ntains
Matroska <tt>Elements</tt> from a higher specification version number while sign aling that a Matroska <tt>Elements</tt> from a higher specification version number while sign aling that a
reading application <bcp14>MUST</bcp14> only support a lower version number prop erly in order to play reading application <bcp14>MUST</bcp14> only support a lower version number prop erly in order to play
it back (possibly with a reduced feature set).</t> it back (possibly with a reduced feature set).</t>
<t>The <tt>EBML Header</tt> of each Matroska document informs the reading applic ation on what <t>The <tt>EBML Header</tt> of each Matroska document informs the reading applic ation on what
version of Matroska to expect. The <tt>Elements</tt> within <tt>EBML Header</tt> with jurisdiction version of Matroska to expect. The <tt>Elements</tt> within the <tt>EBML Header< /tt> with jurisdiction
over this information are <tt>DocTypeVersion</tt> and <tt>DocTypeReadVersion</tt >.</t> over this information are <tt>DocTypeVersion</tt> and <tt>DocTypeReadVersion</tt >.</t>
<t><tt>DocTypeVersion</tt> <bcp14>MUST</bcp14> be equal to or greater than the h ighest Matroska version number of <t><tt>DocTypeVersion</tt> <bcp14>MUST</bcp14> be equal to or greater than the h ighest Matroska version number of
any <tt>Element</tt> present in the Matroska file. For example, a file using the <tt>SimpleBlock Element</tt> (<xref target="simpleblock-element"></xref>) any <tt>Element</tt> present in the Matroska file. For example, a file using the <tt>SimpleBlock Element</tt> (<xref target="simpleblock-element"></xref>)
<bcp14>MUST</bcp14> have a <tt>DocTypeVersion</tt> equal to or greater than 2. A file containing <tt>CueRelativePosition</tt> <bcp14>MUST</bcp14> have a <tt>DocTypeVersion</tt> equal to or greater than 2. A file containing <tt>CueRelativePosition</tt>
Elements (<xref target="cuerelativeposition-element"></xref>) <bcp14>MUST</bcp1 4> have a <tt>DocTypeVersion</tt> equal to or greater than 4.</t> Elements (<xref target="cuerelativeposition-element"></xref>) <bcp14>MUST</bcp1 4> have a <tt>DocTypeVersion</tt> equal to or greater than 4.</t>
<t>The <tt>DocTypeReadVersion</tt> <bcp14>MUST</bcp14> contain the minimum versi on number that a reading application <t>The <tt>DocTypeReadVersion</tt> <bcp14>MUST</bcp14> contain the minimum versi on number that a reading application
can minimally support in order to play the file back -- optionally with a reduce d feature can minimally support in order to play the file back -- optionally with a reduce d feature
set. For example, if a file contains only <tt>Elements</tt> of version 2 or lowe r except for set. For example, if a file contains only <tt>Elements</tt> of version 2 or lowe r except for
<tt>CueRelativePosition</tt> (which is a version 4 Matroska <tt>Element</tt>), t hen <tt>DocTypeReadVersion</tt> <tt>CueRelativePosition</tt> (which is a version 4 Matroska <tt>Element</tt>), t hen <tt>DocTypeReadVersion</tt>
<bcp14>SHOULD</bcp14> still be set to 2 and not 4 because evaluating <tt>CueRela tivePosition</tt> is not <bcp14>SHOULD</bcp14> still be set to 2 and not 4 because evaluating <tt>CueRela tivePosition</tt> is not
necessary for standard playback -- it makes seeking more precise if used.</t> necessary for standard playback -- it makes seeking more precise if used.</t>
<t>A reading application supporting Matroska version <tt>V</tt> <bcp14>MUST NOT< /bcp14> refuse to read a <t>A reading application supporting Matroska version <tt>V</tt> <bcp14>MUST NOT< /bcp14> refuse to read a
file with <tt>DocReadTypeVersion</tt> equal to or lower than <tt>V</tt> even if <tt>DocTypeVersion</tt> file with <tt>DocReadTypeVersion</tt> equal to or lower than <tt>V</tt>, even if <tt>DocTypeVersion</tt>
is greater than <tt>V</tt>.</t> is greater than <tt>V</tt>.</t>
<t>A reading application <t>A reading application
supporting at least Matroska version <tt>V</tt> reading a file whose <tt>DocType ReadVersion</tt> supporting at least Matroska version <tt>V</tt> and reading a file whose <tt>Doc TypeReadVersion</tt>
field is equal to or lower than <tt>V</tt> <bcp14>MUST</bcp14> skip Matroska/EBM L <tt>Elements</tt> it encounters field is equal to or lower than <tt>V</tt> <bcp14>MUST</bcp14> skip Matroska/EBM L <tt>Elements</tt> it encounters
but does not know about if that unknown element fits into the size constraints s et but does not know about if that unknown element fits into the size constraints s et
by the current <tt>Parent Element</tt>.</t> by the current <tt>Parent Element</tt>.</t>
</section> </section>
<section anchor="stream-copy"><name>Stream Copy</name> <section anchor="stream-copy"><name>Stream Copy</name>
<t>It is sometimes necessary to create a Matroska file from another Matroska fil e, for example to add subtitles in a language <t>It is sometimes necessary to create a Matroska file from another Matroska fil e, for example, to add subtitles in a language
or to edit out a portion of the content. or to edit out a portion of the content.
Some values from the original Matroska file need to be kept the same in the dest ination file. Some values from the original Matroska file need to be kept the same in the dest ination file.
For example, the SamplingFrequency of an audio track wouldn't change between the two files. For example, the SamplingFrequency of an audio track wouldn't change between the two files.
Some other values may change between the two files, for example the TrackNumber Some other values may change between the two files, for example, the TrackNumber
of an audio track when another track has been added.</t> of an audio track when another track has been added.</t>
<t>An Element is marked with a property: <tt>stream copy: True</tt> when the val
ues of that Element need to be kept identical between the source and destination <!-- [rfced] Please clarify "with a property: stream copy: True when".
file.
If that property is not set, elements may or may not keep the same value between Original:
the source and destination.</t> An Element is marked with a property: stream copy: True when the
values of that Element need to be kept identical between the source
and destination file.
Perhaps:
An Element is marked with the property "stream copy: True" when the
values of that Element need to be kept identical between the source
and destination files.
-->
<t>An Element is marked with a property: <tt>stream copy: True</tt> when the val
ues of that Element need to be kept identical between the source and destination
files.
If that property is not set, elements may or may not keep the same value between
the source and destination files.</t>
</section> </section>
<section anchor="defaultdecodedfieldduration"><name>DefaultDecodedFieldDuration< /name> <section anchor="defaultdecodedfieldduration"><name>DefaultDecodedFieldDuration< /name>
<t>The <tt>DefaultDecodedFieldDuration Element</tt> can signal to the displaying application how <t>The <tt>DefaultDecodedFieldDuration Element</tt> can signal to the displaying application how
often fields of a video sequence will be available for displaying. It can be use d for both often fields of a video sequence will be available for displaying. It can be use d for both
interlaced and progressive content.</t> interlaced and progressive content.</t>
<t>If the video sequence is signaled as interlaced <xref target="flaginterlaced- element"></xref>, then <tt>DefaultDecodedFieldDuration</tt> equals <t>If the video sequence is signaled as interlaced (<xref target="flaginterlaced -element"></xref>), then <tt>DefaultDecodedFieldDuration</tt> equals
the period between two successive fields at the output of the decoding process. the period between two successive fields at the output of the decoding process.
For video sequences signaled as progressive, <tt>DefaultDecodedFieldDuration</tt > is half of For video sequences signaled as progressive, <tt>DefaultDecodedFieldDuration</tt > is half of
the period between two successive frames at the output of the decoding process.< /t> the period between two successive frames at the output of the decoding process.< /t>
<t>These values are valid at the end of the decoding process before post-process ing <t>These values are valid at the end of the decoding process before post-process ing
(such as deinterlacing or inverse telecine) is applied.</t> (such as deinterlacing or inverse telecine) is applied.</t>
<t>Examples:</t> <t>Examples:</t>
<ul spacing="compact"> <ul>
<li>Blu-ray movie: 1000000000 ns/(48/1.001) = 20854167 ns</li> <li>Blu-ray movie: 1000000000 ns/(48/1.001) = 20854167 ns</li>
<li>PAL broadcast/DVD: 1000000000 ns/(50/1.000) = 20000000 ns</li> <li>PAL broadcast/DVD: 1000000000 ns/(50/1.000) = 20000000 ns</li>
<li>N/ATSC broadcast: 1000000000 ns/(60/1.001) = 16683333 ns</li> <li>N/ATSC broadcast: 1000000000 ns/(60/1.001) = 16683333 ns</li>
<li>hard-telecined DVD: 1000000000 ns/(60/1.001) = 16683333 ns (60 encoded inter <li>Hard-telecined DVD: 1000000000 ns/(60/1.001) = 16683333 ns (60 encoded inter
laced fields per second)</li> laced fields per second)</li>
<li>soft-telecined DVD: 1000000000 ns/(60/1.001) = 16683333 ns (48 encoded inter <li>Soft-telecined DVD: 1000000000 ns/(60/1.001) = 16683333 ns (48 encoded inter
laced fields per second, with &quot;repeat_first_field = 1&quot;)</li> laced fields per second, with "repeat_first_field = 1")</li>
</ul> </ul>
</section> </section>
<section anchor="cluster-blocks"><name>Cluster Blocks</name> <section anchor="cluster-blocks"><name>Cluster Blocks</name>
<t>Frames using references <bcp14>SHOULD</bcp14> be stored in &quot;coding order
&quot;. That means the references first, and then <t>Frames using references <bcp14>SHOULD</bcp14> be stored in "coding order" (i.
the frames referencing them. A consequence is that timestamps might not be conse e., the references first and then
cutive. the frames referencing them). A consequence is that timestamps might not be cons
But a frame with a past timestamp <bcp14>MUST</bcp14> reference a frame already ecutive.
known, otherwise it's considered bad/void.</t> However, a frame with a past timestamp <bcp14>MUST</bcp14> reference a frame alr
eady known; otherwise, it is considered bad/void.</t>
<t>Matroska has two similar ways to store frames in a block:</t> <t>Matroska has two similar ways to store frames in a block:</t>
<ul spacing="compact"> <ul>
<li>in a <tt>Block</tt> which is contained inside a <tt>BlockGroup</tt>,</li> <li>in a <tt>Block</tt> that is contained inside a <tt>BlockGroup</tt></li>
<li>or in a <tt>SimpleBlock</tt> which is directly in the <tt>Cluster</tt>.</li> <li>in a <tt>SimpleBlock</tt> that is directly in the <tt>Cluster</tt></li>
</ul> </ul>
<t>The <tt>SimpleBlock</tt> is usually preferred unless some extra elements of t he <tt>BlockGroup</tt> need to be used. <t>The <tt>SimpleBlock</tt> is usually preferred unless some extra elements of t he <tt>BlockGroup</tt> need to be used.
A Matroska Reader <bcp14>MUST</bcp14> support both types of blocks.</t> A Matroska Reader <bcp14>MUST</bcp14> support both types of blocks.</t>
<t>Each block contains the same parts in the following order:</t> <t>Each block contains the same parts in the following order:</t>
<ul spacing="compact"> <ul>
<li>a variable length header,</li> <li>a variable-length header</li>
<li>optionally the lacing information,</li> <li>the lacing information (optional)</li>
<li>the consecutive frame(s)</li> <li>the consecutive frame(s)</li>
</ul> </ul>
<!-- [rfced] Is "on up to" correct here?
Original:
The value can be coded on up to 8 octets.
Perhaps:
The value can be coded up to 8 octets.
-->
<t>The block header starts with the number of the Track it corresponds to. <t>The block header starts with the number of the Track it corresponds to.
The value <bcp14>MUST</bcp14> corresponding to the <tt>TrackNumber</tt> (<xref t
arget="tracknumber-element"></xref>) of a <tt>TrackEntry</tt> of the <tt>Segment The value <bcp14>MUST</bcp14> correspond to the <tt>TrackNumber</tt> (<xref targ
</tt>.</t> et="tracknumber-element"></xref>) of a <tt>TrackEntry</tt> of the <tt>Segment</t
<t>The <tt>TrackNumber</tt> is coded using the VINT mechanism described in Secti t>.</t>
on 4 of <xref target="RFC8794"></xref>. <t>The <tt>TrackNumber</tt> is coded using the Variable-Size Integer (VINT) mech
anism described in <xref target="RFC8794" sectionFormat="of" section="4"></xref>
.
To save space, the shortest VINT form <bcp14>SHOULD</bcp14> be used. The value c an be coded on up to 8 octets. To save space, the shortest VINT form <bcp14>SHOULD</bcp14> be used. The value c an be coded on up to 8 octets.
This is the only element with a variable size in the block header.</t> This is the only element with a variable size in the block header.</t>
<t>The timestamp is expressed in Track Ticks; see <xref target="timestamp-ticks" ></xref>. <t>The timestamp is expressed in Track Ticks; see <xref target="timestamp-ticks" ></xref>.
The value is stored as a signed value on 16 bits.</t> The value is stored as a signed value on 16 bits.</t>
<section anchor="block-structure"><name>Block Structure</name> <section anchor="block-structure"><name>Block Structure</name>
<t>This section describes the binary data contained in the <tt>Block</tt> Elemen t <xref target="block-element"></xref>. Bit 0 is the most significant bit.</t> <t>This section describes the binary data contained in the <tt>Block</tt> Elemen t (<xref target="block-element"></xref>). Bit 0 is the most significant bit.</t>
<t>As the <tt>TrackNumber</tt> size can vary between 1 and 8 octets, there are 8 different sizes for the <tt>Block</tt> header. <t>As the <tt>TrackNumber</tt> size can vary between 1 and 8 octets, there are 8 different sizes for the <tt>Block</tt> header.
We only provide the definitions for <tt>TrackNumber</tt> sizes of 1 and 2. The definitions for <tt>TrackNumber</tt> sizes of 1 and 2 are provided; the othe
The other variants can be deduced by extending the size of the <tt>TrackNumber</ r variants can be deduced by extending the size of the <tt>TrackNumber</tt> by m
tt> by multiples of 8 bits.</t> ultiples of 8 bits.</t>
<figure><name>Block Header with 1 octet TrackNumber <figure><name>Block Header with 1-Octet TrackNumber
</name> </name>
<artwork> 0 1 2 3 <artwork>
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
| | | |I|LAC|U| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Track Number | Timestamp | Rsvrd |N|ING|N| | | | |I|LAC|U|
| | | |V| |U| | Track Number | Timestamp | Rsvrd |N|ING|N|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | | |V| |U|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</artwork> </artwork>
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</figure> </figure>
<figure><name>Block Header with 2 octets TrackNumber <figure><name>Block Header with 2-Octet TrackNumber
</name> </name>
<artwork> 0 1 2 3 <artwork>
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
| Track Number | Timestamp | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Track Number | Timestamp |
| |I|LAC|U| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Rsvrd |N|ING|N| ... | |I|LAC|U|
| |V| |U| | Rsvrd |N|ING|N| ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |V| |U|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</artwork> </artwork>
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</figure> </figure>
<t>where:</t> <t>where:</t>
<dl newline="false" spacing="normal">
<dt>Track Number:</dt><dd>8, 16, 24, 32, 40, 48, or 64 bits. An EBML VINT-coded
track number.</dd>
<dt>Timestamp:</dt><dd>16 bits. Signed timestamp in Track Ticks.</dd>
<dt>Rsvrd:</dt><dd>4 bits. Reserved bits <bcp14>MUST</bcp14> be set to 0.</dd>
<dt>INV:</dt><dd>1 bit. Invisible. The codec <bcp14>SHOULD</bcp14> decode this f
rame but not display it.</dd>
<dt>LACING:</dt><dd><t>2 bits. Uses lacing mode.</t>
<dl newline="true" spacing="normal"> <dl spacing="compact">
<dt>Track Number: 8, 16, 24, 32, 40, 48 or 64 bits</dt> <dt>00b:</dt><dd>no lacing (<xref target="no-lacing"></xref>)</dd>
<dd>an EBML VINT coded track number</dd> <dt>01b:</dt><dd>Xiph lacing (<xref target="xiph-lacing"></xref>)</dd>
<dt>Timestamp: 16 bits</dt> <dt>11b:</dt><dd>EBML lacing (<xref target="ebml-lacing"></xref>)</dd>
<dd>signed timestamp in Track Ticks</dd> <dt>10b:</dt><dd>fixed-size lacing (<xref target="fixed-size-lacing"></xref>)</d
<dt>Rsvrd: 4 bits</dt> d>
<dd>Reserved bits <bcp14>MUST</bcp14> be set to 0</dd> </dl></dd>
<dt>INV: 1 bit</dt> <dt>UNU:</dt><dd>1 bit. Unused bit.</dd>
<dd>Invisible, the codec <bcp14>SHOULD</bcp14> decode this frame but not display
it</dd>
<dt>LACING: 2 bits</dt>
<dd><t>using lacing mode</t>
<ul spacing="compact">
<li>00b : no lacing (<xref target="no-lacing"></xref>)</li>
<li>01b : Xiph lacing (<xref target="xiph-lacing"></xref>)</li>
<li>11b : EBML lacing (<xref target="ebml-lacing"></xref>)</li>
<li>10b : fixed-size lacing (<xref target="fixed-size-lacing"></xref>)</li>
</ul></dd>
<dt>UNU: 1 bit</dt>
<dd>unused bit</dd>
</dl> </dl>
<t>The following data in the <tt>Block</tt> correspond to the lacing data and fr
ames usage as described in each respective lacing mode.</t> <t>The following data in the <tt>Block</tt> corresponds to the lacing data and f
rames usage as described in each respective lacing mode.</t>
</section> </section>
<section anchor="simpleblock-structure"><name>SimpleBlock Structure</name> <section anchor="simpleblock-structure"><name>SimpleBlock Structure</name>
<t>This section describes the binary data contained in the <tt>SimpleBlock</tt> <t>This section describes the binary data contained in the <tt>SimpleBlock</tt>
Element <xref target="simpleblock-element"></xref>. Bit 0 is the most significan Element (<xref target="simpleblock-element"></xref>). Bit 0 is the most signific
t bit.</t> ant bit.</t>
<t>The <tt>SimpleBlock</tt> is inspired by the Block structure; see <xref target <t>The <tt>SimpleBlock</tt> structure is inspired by the Block structure; see <x
="block-structure"></xref>. ref target="block-structure"></xref>.
The main differences are the added Keyframe flag and Discardable flag. Otherwise , everything is the same.</t> The main differences are the added Keyframe flag and Discardable flag. Otherwise , everything is the same.</t>
<t>As the <tt>TrackNumber</tt> size can vary between 1 and 8 octets, there are 8 different sizes for the <tt>SimpleBlock</tt> header. <t>As the <tt>TrackNumber</tt> size can vary between 1 and 8 octets, there are 8 different sizes for the <tt>SimpleBlock</tt> header.
We only provide the definitions for <tt>TrackNumber</tt> sizes of 1 and 2. The definitions for <tt>TrackNumber</tt> sizes of 1 and 2 are provided; the
The other variants can be deduced by extending the size of the <tt>TrackNumber</ other variants can be deduced by extending the size of the
tt> by multiples of 8 bits.</t> <tt>TrackNumber</tt> by multiples of 8 bits.</t>
<figure><name>SimpleBlock Header with 1 octet TrackNumber <figure><name>SimpleBlock Header with 1-Octet TrackNumber
</name> </name>
<artwork> 0 1 2 3 <artwork>
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
| | |K| |I|LAC|D| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Track Number | Timestamp |E|Rsvrd|N|ING|I| | | |K| |I|LAC|D|
| | |Y| |V| |S| | Track Number | Timestamp |E|Rsvrd|N|ING|I|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | |Y| |V| |S|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</artwork> </artwork>
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</figure> </figure>
<figure><name>SimpleBlock Header with 2 octets TrackNumber <figure><name>SimpleBlock Header with 2-Octet TrackNumber
</name> </name>
<artwork> 0 1 2 3 <artwork>
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
| Track Number | Timestamp | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Track Number | Timestamp |
|K| |I|LAC|D| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|E|Rsvrd|N|ING|I| ... |K| |I|LAC|D|
|Y| |V| |S| |E|Rsvrd|N|ING|I| ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Y| |V| |S|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</artwork> </artwork>
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
</figure> </figure>
<t>where:</t> <t>where:</t>
<dl newline="true" spacing="normal"> <dl newline="false" spacing="normal">
<dt>Track Number: 8, 16, 24, 32, 40, 48 or 64 bits</dt> <dt>Track Number:</dt><dd>8, 16, 24, 32, 40, 48, or 64 bits. An EBML VINT-coded
<dd>an EBML VINT coded track number</dd> track number.</dd>
<dt>Timestamp: 16 bits</dt> <dt>Timestamp:</dt><dd>16 bits. Signed timestamp in Track Ticks.</dd>
<dd>signed timestamp in Track Ticks</dd> <dt>KEY:</dt><dd>1 bit. Keyframe. Set when the Block contains only keyframes.</d
<dt>KEY: 1 bit</dt> d>
<dd>Keyframe, set when the Block contains only keyframes</dd> <dt>Rsvrd:</dt><dd>3 bits. Reserved bits <bcp14>MUST</bcp14> be set to 0.</dd>
<dt>Rsvrd: 3 bits</dt> <dt>INV:</dt><dd>1 bit. Invisible. The codec <bcp14>SHOULD</bcp14> decode this f
<dd>Reserved bits <bcp14>MUST</bcp14> be set to 0</dd> rame but not display it.</dd>
<dt>INV: 1 bit</dt> <dt>LACING:</dt><dd><t>2 bits. Uses lacing mode.</t>
<dd>Invisible, the codec <bcp14>SHOULD</bcp14> decode this frame but not display
it</dd>
<dt>LACING: 2 bits</dt>
<dd><t>using lacing mode</t>
<ul spacing="compact"> <dl spacing="compact">
<li>00b : no lacing (<xref target="no-lacing"></xref>)</li> <dt>00b:</dt><dd>no lacing (<xref target="no-lacing"></xref>)</dd>
<li>01b : Xiph lacing (<xref target="xiph-lacing"></xref>)</li> <dt>01b:</dt><dd>Xiph lacing (<xref target="xiph-lacing"></xref>)</dd>
<li>11b : EBML lacing (<xref target="ebml-lacing"></xref>)</li> <dt>11b:</dt><dd>EBML lacing (<xref target="ebml-lacing"></xref>)</dd>
<li>10b : fixed-size lacing (<xref target="fixed-size-lacing"></xref>)</li> <dt>10b:</dt><dd>fixed-size lacing (<xref target="fixed-size-lacing"></xref>)</d
</ul></dd> d>
<dt>DIS: 1 bit</dt> </dl></dd>
<dd>Discardable, the frames of the Block can be discarded during playing if need <dt>DIS:</dt><dd>1 bit. Discardable. The frames of the Block can be discarded du
ed</dd> ring playing if needed.</dd>
</dl> </dl>
<t>The following data in the <tt>SimpleBlock</tt> correspond to the lacing data <!-- [rfced] Please clarify "The following data" in these similar
and frames usage as described in each respective lacing mode.</t> sentences. Is the intended meaning "The remaining data", or something
else? Would a pointer to Section 10.3 be helpful?
Original:
The following data in the Block correspond to the lacing data and
frames usage as described in each respective lacing mode.
...
The following data in the SimpleBlock correspond to the lacing data
and frames usage as described in each respective lacing mode.
Perhaps:
The remaining data in the Block corresponds to the lacing data and
frames usage as described in each respective lacing mode (see Section 10.3).
...
The remaining data in the SimpleBlock corresponds to the lacing data
and frames usage as described in each respective lacing mode (see Section 10.
3).
-->
<t>The following data in the <tt>SimpleBlock</tt> corresponds to the lacing data
and frames usage as described in each respective lacing mode.</t>
</section> </section>
<section anchor="block-lacing"><name>Block Lacing</name> <section anchor="block-lacing"><name>Block Lacing</name>
<t>Lacing is a mechanism to save space when storing data. It is typically used f or small blocks <t>Lacing is a mechanism to save space when storing data. It is typically used f or small blocks
of data (referred to as frames in Matroska). It packs multiple frames into a sin gle <tt>Block</tt> or <tt>SimpleBlock</tt>.</t> of data (referred to as frames in Matroska). It packs multiple frames into a sin gle <tt>Block</tt> or <tt>SimpleBlock</tt>.</t>
<t>Lacing <bcp14>MUST NOT</bcp14> be used to store a single frame in a <tt>Block </tt> or <tt>SimpleBlock</tt>.</t> <t>Lacing <bcp14>MUST NOT</bcp14> be used to store a single frame in a <tt>Block </tt> or <tt>SimpleBlock</tt>.</t>
<t>There are 3 types of lacing:</t> <t>There are three types of lacing:</t>
<ol spacing="compact"> <ul>
<li>Xiph, inspired by what is found in the Ogg container <xref target="RFC3533"> <li>Xiph, which is inspired by what is found in the Ogg container <xref target="
</xref></li> RFC3533"></xref></li>
<li>EBML, which is the same with sizes coded differently</li> <li>EBML, which is the same with sizes coded differently</li>
<li>fixed-size, where the size is not coded</li> <li>Fixed-size, where the size is not coded</li>
</ol> </ul>
<t>When lacing is not used, i.e. to store a single frame, the lacing bits 5 and <!-- [rfced] We have two questions about the sentences below.
6 of the <tt>Block</tt> or <tt>SimpleBlock</tt> <bcp14>MUST</bcp14> be set to ze
ro.</t> a) Please confirm that "bits 5 and 6" and "bits 5-6" are correct in the text
<t>For example, a user wants to store 3 frames of the same track. The first fram below. Or should this be "bits 6-7" per Figures 11-14? Or possibly just "The
e is 800 octets long, LACING bits"?
the second is 500 octets long and the third is 1000 octets long. As these data a
re small, b) The sentences below have "0b00", "0b01", "0b11", and "0b10", but Sections
10.1 and 10.2 have "00b", "01b", "11b", and "10b" for the LACING bits. Please
review and let us know if any updates are needed.
Original:
When lacing is not used, i.e. to store a single frame, the lacing
bits 5 and 6 of the Block or SimpleBlock MUST be set to zero.
The bits 5-6 of the Block Header flags are set to 0b00.
The bits 5-6 of the Block Header flags are set to 0b01.
The bits 5-6 of the Block Header flags are set to 0b11.
The bits 5-6 of the Block Header flags are set to 0b10.
Perhaps:
When lacing is not used, i.e. to store a single frame, the lacing
bits 6 and 7 of the Block or SimpleBlock MUST be set to zero.
Bits 6-7 of the Block Header flags are set to 00b.
Bits 6-7 of the Block Header flags are set to 01b.
Bits 6-7 of the Block Header flags are set to 11b.
Bits 6-7 of the Block Header flags are set to 10b.
Or:
When lacing is not used, i.e. to store a single frame, the lacing
bits (bits 6 and 7) of the Block or SimpleBlock MUST be set to zero.
The LACING bits of the Block Header flags are set to 00b.
The LACING bits of the Block Header flags are set to 01b.
The LACING bits of the Block Header flags are set to 11b.
The LACING bits of the Block Header flags are set to 10b.
-->
<t>When lacing is not used, i.e., to store a single frame, lacing bits 5 and 6 o
f the <tt>Block</tt> or <tt>SimpleBlock</tt> <bcp14>MUST</bcp14> be set to 0.</t
>
<t>For example, a user wants to store three frames of the same track. The first
frame is 800 octets long,
the second is 500 octets long, and the third is 1000 octets long.
<!-- [rfced] We updated "these data" to "frames". Please let us know any
objections.
Original:
As these data are small, they can be stored in a lace to save space.
Current:
Because these frames are small, they can be stored in a lace to save space.
-->
Because these frames are small,
they can be stored in a lace to save space.</t> they can be stored in a lace to save space.</t>
<t>It is possible not to use lacing at all and just store a single frame without <t>It is possible to not use lacing at all and just store a single frame without
any extra data. any extra data.
When the FlagLacing -- <xref target="flaglacing-element"></xref> -- is set to &q When the FlagLacing (<xref target="flaglacing-element"></xref>) is set to 0, all
uot;0&quot; all blocks of that track <bcp14>MUST NOT</bcp14> use lacing.</t> blocks of that track <bcp14>MUST NOT</bcp14> use lacing.</t>
<section anchor="no-lacing"><name>No lacing</name> <section anchor="no-lacing"><name>No Lacing</name>
<t>When no lacing is used, the number of frames in the lace is ommitted and only <t>When no lacing is used, the number of frames in the lace is ommitted, and onl
one frame can be stored in the Block. y one frame can be stored in the Block.
The bits 5-6 of the Block Header flags are set to <tt>0b00</tt>.</t> Bits 5 and 6 of the Block Header flags are set to <tt>0b00</tt>.</t>
<t>The Block for an 800 octets frame is as follows:</t> <t>The Block for an 800-octet frame is as follows:</t>
<table anchor="blockNoLacing"><name>No lacing</name> <table anchor="blockNoLacing"><name>No Lacing</name>
<thead> <thead>
<tr> <tr>
<th align="left">Block Octets</th> <th align="left">Block Octet</th>
<th align="left">Value</th> <th align="left">Value</th>
<th align="left">Description</th> <th align="left">Description</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">4-803</td> <td align="left">4-803</td>
<td align="left">&lt;frame&gt;</td> <td align="left">&lt;frame&gt;</td>
<td align="left">Single frame data</td> <td align="left">Single frame data</td>
</tr> </tr>
</tbody> </tbody>
</table><t>When a Block contains a single frame, it <bcp14>MUST</bcp14> use this </table>
No lacing mode.</t>
<t>When a Block contains a single frame, it <bcp14>MUST</bcp14> use this "no lac
ing" mode.</t>
</section> </section>
<section anchor="xiph-lacing"><name>Xiph lacing</name> <section anchor="xiph-lacing"><name>Xiph Lacing</name>
<t>The Xiph lacing uses the same coding of size as found in the Ogg container <x ref target="RFC3533"></xref>. <t>The Xiph lacing uses the same coding of size as found in the Ogg container <x ref target="RFC3533"></xref>.
The bits 5-6 of the Block Header flags are set to <tt>0b01</tt>.</t> Bits 5 and 6 of the Block Header flags are set to <tt>0b01</tt>.</t>
<t>The Block data with laced frames is stored as follows:</t> <t>The Block data with laced frames is stored as follows:</t>
<ul spacing="compact"> <ul>
<li>Lacing Head on 1 Octet: Number of frames in the lace minus 1.</li> <!-- [rfced] Will readers understand the following? Note that this text
appears in three locations in the document.
Original:
* Lacing Head on 1 Octet: Number of frames in the lace minus 1.
-->
<li>Lacing Head on 1 octet: Number of frames in the lace minus 1.</li>
<li>Lacing size of each frame except the last one.</li> <li>Lacing size of each frame except the last one.</li>
<li>Binary data of each frame consecutively.</li> <li>Binary data of each frame consecutively.</li>
</ul> </ul>
<t>The lacing size is split into 255 values, stored as unsigned octets -- for ex ample, 500 is coded 255;245 or [0xFF 0xF5]. <t>The lacing size is split into 255 values, stored as unsigned octets -- for ex ample, 500 is coded 255;245 or [0xFF 0xF5].
A frame with a size multiple of 255 is coded with a 0 at the end of the size -- for example, 765 is coded 255;255;255;0 or [0xFF 0xFF 0xFF 0x00].</t> A frame with a size multiple of 255 is coded with a 0 at the end of the size -- for example, 765 is coded 255;255;255;0 or [0xFF 0xFF 0xFF 0x00].</t>
<t>The size of the last frame is deduced from the size remaining in the Block af ter the other frames.</t> <t>The size of the last frame is deduced from the size remaining in the Block af ter the other frames.</t>
<t>Because large sizes result in large coding of the sizes, it is <bcp14>RECOMME NDED</bcp14> to use Xiph lacing only with small frames.</t> <t>Because large sizes result in large coding of the sizes, it is <bcp14>RECOMME NDED</bcp14> to use Xiph lacing only with small frames.</t>
<t>In our example, the 800, 500 and 1000 frames are stored with Xiph lacing in a <t>In our example, the 800-, 500-, and 1000-octet frames are stored with Xiph la
Block as follows:</t> cing in a Block as follows:</t>
<table anchor="blockXiphLacing"><name>Xiph lacing example</name> <table anchor="blockXiphLacing"><name>Xiph Lacing Example</name>
<thead> <thead>
<tr> <tr>
<th align="left">Block Octet</th> <th align="left">Block Octets</th>
<th align="left">Value</th> <th align="left">Value</th>
<th align="left">Description</th> <th align="left">Description</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">4</td> <td align="left">4</td>
<td align="left">0x02</td> <td align="left">0x02</td>
<td align="left">Number of frames minus 1</td> <td align="left">Number of frames minus 1</td>
skipping to change at line 5605 skipping to change at line 6205
<td align="left"></td> <td align="left"></td>
<td align="left">Second frame data</td> <td align="left">Second frame data</td>
</tr> </tr>
<tr> <tr>
<td align="left">1311-2310</td> <td align="left">1311-2310</td>
<td align="left"></td> <td align="left"></td>
<td align="left">Third frame data</td> <td align="left">Third frame data</td>
</tr> </tr>
</tbody> </tbody>
</table><t>The Block is 2311 octets large and the last frame starts at 1311, so we can deduce the size of the last frame is 2311 - 1311 = 1000.</t> </table><t>The Block is 2311 octets, and the last frame starts at 1311, so we ca n deduce that the size of the last frame is 2311 - 1311 = 1000.</t>
</section> </section>
<section anchor="ebml-lacing"><name>EBML lacing</name> <section anchor="ebml-lacing"><name>EBML Lacing</name>
<t>The EBML lacing encodes the frame size with an EBML-like encoding <xref targe t="RFC8794"></xref>. <t>The EBML lacing encodes the frame size with an EBML-like encoding <xref targe t="RFC8794"></xref>.
The bits 5-6 of the Block Header flags are set to <tt>0b11</tt>.</t> Bits 5 and 6 of the Block Header flags are set to <tt>0b11</tt>.</t>
<t>The Block data with laced frames is stored as follows:</t> <t>The Block data with laced frames is stored as follows:</t>
<ul spacing="compact"> <ul>
<li>Lacing Head on 1 Octet: Number of frames in the lace minus 1.</li> <li>Lacing Head on 1 Octet: Number of frames in the lace minus 1.</li>
<li>Lacing size of each frame except the last one.</li> <li>Lacing size of each frame except the last one.</li>
<li>Binary data of each frame consecutively.</li> <li>Binary data of each frame consecutively.</li>
</ul> </ul>
<t>The first frame size is encoded as an EBML Variable-Size Integer value, also known as VINT in <xref target="RFC8794"></xref>. <t>The first frame size is encoded as an EBML VINT value.
The remaining frame sizes are encoded as signed values using the difference betw een the frame size and the previous frame size. The remaining frame sizes are encoded as signed values using the difference betw een the frame size and the previous frame size.
These signed values are encoded as VINT, with a mapping from signed to unsigned numbers. These signed values are encoded as VINT, with a mapping from signed to unsigned numbers.
Decoding the unsigned number stored in the VINT to a signed number is done by su btracting 2<sup>((7*n)-1)</sup>-1, where <tt>n</tt> is the octet size of the VIN T.</t> Decoding the unsigned number stored in the VINT to a signed number is done by su btracting 2<sup>((7*n)-1)</sup>-1, where <tt>n</tt> is the octet size of the VIN T.</t>
<table anchor="ebmlLacingBits"><name>EBML Lacing signed VINT bits usage</name> <table anchor="ebmlLacingBits"><name>EBML Lacing Signed VINT Bits Usage</name>
<thead> <thead>
<tr> <tr>
<th align="left">Bit Representation of signed VINT</th> <th align="left">Bit Representation of Signed VINT</th>
<th align="left">Possible Value Range</th> <th align="left">Possible Value Range</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">1xxx xxxx</td> <td align="left">1xxx xxxx</td>
<td align="left">2^7 values from -(2<sup>6</sup>-1) to 2<sup>6</sup></td> <td align="left">2^7 values from -(2<sup>6</sup>-1) to 2<sup>6</sup></td>
</tr> </tr>
skipping to change at line 5656 skipping to change at line 6257
<tr> <tr>
<td align="left">0001 xxxx xxxx xxxx xxxx xxxx xxxx xxxx</td> <td align="left">0001 xxxx xxxx xxxx xxxx xxxx xxxx xxxx</td>
<td align="left">2^28 values from -(2<sup>27</sup>-1) to 2<sup>27</sup></td> <td align="left">2^28 values from -(2<sup>27</sup>-1) to 2<sup>27</sup></td>
</tr> </tr>
<tr> <tr>
<td align="left">0000 1xxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx</td> <td align="left">0000 1xxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx</td>
<td align="left">2^35 values from -(2<sup>34</sup>-1) to 2<sup>34</sup></td> <td align="left">2^35 values from -(2<sup>34</sup>-1) to 2<sup>34</sup></td>
</tr> </tr>
</tbody> </tbody>
</table><t>In our example, the 800, 500 and 1000 frames are stored with EBML lac </table><t>In our example, the 800-, 500- and 1000-octet frames are stored with
ing in a Block as follows:</t> EBML lacing in a Block as follows:</t>
<table anchor="blockEbmlLacing"><name>EBML lacing example</name> <table anchor="blockEbmlLacing"><name>EBML Lacing Example</name>
<thead> <thead>
<tr> <tr>
<th align="left">Block Octets</th> <th align="left">Block Octets</th>
<th align="left">Value</th> <th align="left">Value</th>
<th align="left">Description</th> <th align="left">Description</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 5703 skipping to change at line 6304
<td align="left">&lt;frame2&gt;</td> <td align="left">&lt;frame2&gt;</td>
<td align="left">Second frame data</td> <td align="left">Second frame data</td>
</tr> </tr>
<tr> <tr>
<td align="left">1308-2307</td> <td align="left">1308-2307</td>
<td align="left">&lt;frame3&gt;</td> <td align="left">&lt;frame3&gt;</td>
<td align="left">Third frame data</td> <td align="left">Third frame data</td>
</tr> </tr>
</tbody> </tbody>
</table><t>The Block is 2308 octets large and the last frame starts at 1308, so we can deduce the size of the last frame is 2308 - 1308 = 1000.</t> </table><t>The Block is 2308 octets, and the last frame starts at 1308, so we ca n deduce that the size of the last frame is 2308 - 1308 = 1000.</t>
</section> </section>
<section anchor="fixed-size-lacing"><name>Fixed-size lacing</name> <section anchor="fixed-size-lacing"><name>Fixed-size Lacing</name>
<t>The Fixed-size lacing doesn't store the frame size, only the number of frames <t>Fixed-size lacing doesn't store the frame size; rather, it only stores the nu
in the lace. mber of frames in the lace.
Each frame <bcp14>MUST</bcp14> have the same size. The frame size of each frame is deduced from the total size of the Block. Each frame <bcp14>MUST</bcp14> have the same size. The frame size of each frame is deduced from the total size of the Block.
The bits 5-6 of the Block Header flags are set to <tt>0b10</tt>.</t> Bits 5 and 6 of the Block Header flags are set to <tt>0b10</tt>.</t>
<t>The Block data with laced frames is stored as follows:</t> <t>The Block data with laced frames is stored as follows:</t>
<ul spacing="compact"> <ul>
<li>Lacing Head on 1 Octet: Number of frames in the lace minus 1.</li> <li>Lacing Head on 1 Octet: Number of frames in the lace minus 1.</li>
<li>Binary data of each frame consecutively.</li> <li>Binary data of each frame consecutively.</li>
</ul> </ul>
<t>For example, for 3 frames of 800 octets each:</t> <t>For example, for three frames that are 800 octets each:</t>
<table anchor="blockFixedSizeLacing"><name>Fixed-size lacing example</name> <table anchor="blockFixedSizeLacing"><name>Fixed-Size Lacing Example</name>
<thead> <thead>
<tr> <tr>
<th align="left">Block Octets</th> <th align="left">Block Octets</th>
<th align="left">Value</th> <th align="left">Value</th>
<th align="left">Description</th> <th align="left">Description</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 5751 skipping to change at line 6352
<td align="left">&lt;frame2&gt;</td> <td align="left">&lt;frame2&gt;</td>
<td align="left">Second frame data</td> <td align="left">Second frame data</td>
</tr> </tr>
<tr> <tr>
<td align="left">1605-2404</td> <td align="left">1605-2404</td>
<td align="left">&lt;frame3&gt;</td> <td align="left">&lt;frame3&gt;</td>
<td align="left">Third frame data</td> <td align="left">Third frame data</td>
</tr> </tr>
</tbody> </tbody>
</table><t>This gives a Block of 2405 octets. When reading the Block we find tha t there are 3 frames (Octet 4). </table><t>This gives a Block of 2405 octets. When reading the Block, we find th at there are three frames (Octet 4).
The data start at Octet 5, so the size of each frame is (2405 - 5) / 3 = 800.</t > The data start at Octet 5, so the size of each frame is (2405 - 5) / 3 = 800.</t >
</section> </section>
<section anchor="laced-frames-timestamp"><name>Laced Frames Timestamp</name> <section anchor="laced-frames-timestamp"><name>Laced Frames Timestamp</name>
<t>A Block only contains a single timestamp value. But when lacing is used, it c ontains more than one frame. <t>A Block only contains a single timestamp value. But when lacing is used, it c ontains more than one frame.
Each frame originally has its own timestamp, or Presentation Timestamp (PTS). Th at timestamp applies to Each frame originally has its own timestamp, or Presentation Timestamp (PTS). Th at timestamp applies to
the first frame in the lace.</t> the first frame in the lace.</t>
<t>In the lace, each frame after the first one has an underdetermined timestamp. <t>In the lace, each frame after the first one has an underdetermined timestamp.
But each of these frames <bcp14>MUST</bcp14> be contiguous -- i.e. the decoded d ata <bcp14>MUST NOT</bcp14> contain any gap However, each of these frames <bcp14>MUST</bcp14> be contiguous -- i.e., the dec oded data <bcp14>MUST NOT</bcp14> contain any gap
between them. If there is a gap in the stream, the frames around the gap <bcp14> MUST NOT</bcp14> be in the same Block.</t> between them. If there is a gap in the stream, the frames around the gap <bcp14> MUST NOT</bcp14> be in the same Block.</t>
<t>Lacing is only useful for small contiguous data to save space. This is usuall y the case for audio tracks <t>Lacing is only useful for small contiguous data to save space. This is usuall y the case for audio tracks
and not the case for video -- which use a lot of data -- or subtitle tracks -- w and not the case for video (which use a lot of data) or subtitle tracks (which h
hich have long gaps. ave long gaps).
For audio, there is usually a fixed output sampling frequency for the whole trac For audio, there is usually a fixed output sampling frequency for the whole trac
k. k,
So the decoder should be able to recover the timestamp of each sample, knowing e so the decoder should be able to recover the timestamp of each sample, knowing e
ach ach
output sample is contiguous with a fixed frequency. output sample is contiguous with a fixed frequency.
For subtitles this is usually not the case so lacing <bcp14>SHOULD NOT</bcp14> b e used.</t> For subtitles, this is usually not the case, so lacing <bcp14>SHOULD NOT</bcp14> be used.</t>
</section> </section>
</section> </section>
<section anchor="random-access-points"><name>Random Access Points</name> <section anchor="random-access-points"><name>Random Access Points</name>
<t>Random Access Points (RAP) are positions where the parser can seek to and sta
rt playback without decoding <t>Random Access Points (RAPs) are positions where the parser can seek to and
of what was before. In Matroska <tt>BlockGroups</tt> and <tt>SimpleBlocks</tt> c start playback without decoding what was before. In Matroska,
an be RAPs. <tt>BlockGroups</tt> and <tt>SimpleBlocks</tt> can be RAPs.
To seek to these elements it is still necessary to seek to the <tt>Cluster</tt>
containing them, <!-- [rfced] Is RAP read as "rap" or "R-A-P"? We ask for guidance in order to
read the Cluster Timestamp choose the appropriate indefinite article for it to follow (i.e., a or
an). We see both "an RAP" and "a RAP" in the document.-->
To seek to these elements, it is still necessary to seek to the <tt>Cluster</tt>
containing them,
read the Cluster Timestamp,
and start playback from the <tt>BlockGroup</tt> or <tt>SimpleBlock</tt> that is a RAP.</t> and start playback from the <tt>BlockGroup</tt> or <tt>SimpleBlock</tt> that is a RAP.</t>
<t>Because a Matroska File is usually composed of multiple tracks playing at the same time <t>Because a Matroska File is usually composed of multiple tracks playing at the same time
taken in account. Usually all audio and subtitle <tt>BlockGroup</tt> or <tt>Simp -- video, audio, and subtitles -- to seek properly to a RAP, each selected track
leBlock</tt> are RAP. must be
taken in account. Usually, all audio and subtitle <tt>BlockGroups</tt> or <tt>Si
mpleBlocks</tt> are RAPs.
They are independent of each other and can be played randomly.</t> They are independent of each other and can be played randomly.</t>
<t>Video tracks on the other hand often use references to previous and future fr <t>On the other hand, video tracks often use references to previous and future f
ames for better rames for better
coding efficiency. Frames with such reference <bcp14>MUST</bcp14> either contain coding efficiency. Frames with such references <bcp14>MUST</bcp14> either contai
one or more n one or more
<tt>ReferenceBlock</tt> Elements in their <tt>BlockGroup</tt> or <bcp14>MUST</bc p14> be marked <tt>ReferenceBlock</tt> Elements in their <tt>BlockGroup</tt> or <bcp14>MUST</bc p14> be marked
as non-keyframe in a <tt>SimpleBlock</tt>; see <xref target="simpleblock-structu re"></xref>.</t> as non-keyframe in a <tt>SimpleBlock</tt>; see <xref target="simpleblock-structu re"></xref>.</t>
<ul spacing="compact"> <!-- [rfced] In Section 10.4, would you like to change the text introducing
<li>BlockGroup with a frame that references another frame, with the EBML tree sh the XML examples to be figure titles (would appear under the XML and also
own as XML:</li> include a figure number)? Or do you prefer the current?
</ul>
Current:
BlockGroup with a frame that references another frame, with the
EBML tree shown as XML:
Perhaps (below XML example):
Figure 15: Blockgroup with a Frame That References Another Frame,
with the EBML Tree Shown as XML
-->
<t>BlockGroup with a frame that references another frame, with the EBML tree sho
wn as XML:</t>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;BlockGroup&gt; &lt;BlockGroup&gt;
&lt;!-- References a Block 40 Track Ticks before this one --&gt; &lt;!-- References a Block 40 Track Ticks before this one --&gt;
&lt;ReferenceBlock&gt;-40&lt;/ReferenceBlock&gt; &lt;ReferenceBlock&gt;-40&lt;/ReferenceBlock&gt;
&lt;Block/&gt; &lt;Block/&gt;
&lt;/BlockGroup&gt; &lt;/BlockGroup&gt;
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
<ul spacing="compact"> <t>SimpleBlock with a frame that references another frame, with the EBML tree sh
<li>SimpleBlock with a frame that references another frame, with the EBML tree s own as XML:</t>
hown as XML:</li>
</ul>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;SimpleBlock/&gt; (octet 3 bit 0 not set) &lt;SimpleBlock/&gt; (octet 3 bit 0 not set)
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
<t>Frames that are RAP -- i.e. they don't depend on other frames -- <bcp14>MUST< /bcp14> set the keyframe <t>Frames that are RAPs (i.e., frames that don't depend on other frames) <bcp14> MUST</bcp14> set the keyframe
flag if they are in a <tt>SimpleBlock</tt> or their parent <tt>BlockGroup</tt> < bcp14>MUST NOT</bcp14> contain flag if they are in a <tt>SimpleBlock</tt> or their parent <tt>BlockGroup</tt> < bcp14>MUST NOT</bcp14> contain
a <tt>ReferenceBlock</tt>.</t> a <tt>ReferenceBlock</tt>.</t>
<ul spacing="compact"> <t>BlockGroup with a frame that references no other frame, with the EBML tree sh
<li>BlockGroup with a frame that references no other frame, with the EBML tree s own as XML:</t>
hown as XML:</li>
</ul>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;BlockGroup&gt; &lt;BlockGroup&gt;
&lt;!-- No ReferenceBlock allowed in this BlockGroup --&gt; &lt;!-- No ReferenceBlock allowed in this BlockGroup --&gt;
&lt;Block/&gt; &lt;Block/&gt;
&lt;/BlockGroup&gt; &lt;/BlockGroup&gt;
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
<ul spacing="compact"> <t>SimpleBlock with a frame that references no other frame, with the EBML tree s
<li>SimpleBlock with a frame that references no other frame, with the EBML tree hown as XML:</t>
shown as XML:</li>
</ul>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;SimpleBlock/&gt; (octet 3 bit 0 set) &lt;SimpleBlock/&gt; (octet 3 bit 0 set)
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
<t>There may be cases where the use of <tt>BlockGroup</tt> is necessary, as the frame may need a <t>There may be cases where the use of <tt>BlockGroup</tt> is necessary, as the frame may need a
<tt>BlockDuration</tt>, <tt>BlockAdditions</tt>, <tt>CodecState</tt> or a <tt>Di <tt>BlockDuration</tt>, <tt>BlockAdditions</tt>, <tt>CodecState</tt>, or <tt>Dis
scardPadding</tt> element. cardPadding</tt> element.
For thoses cases a <tt>SimpleBlock</tt> <bcp14>MUST NOT</bcp14> be used, For thoses cases, a <tt>SimpleBlock</tt> <bcp14>MUST NOT</bcp14> be used;
the reference information <bcp14>SHOULD</bcp14> be recovered for non-RAP frames. </t> the reference information <bcp14>SHOULD</bcp14> be recovered for non-RAP frames. </t>
<ul spacing="compact"> <t>SimpleBlock with a frame that references another frame, with the EBML tree sh
<li>SimpleBlock with a frame that references another frame, with the EBML tree s own as XML:</t>
hown as XML:</li>
</ul>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;SimpleBlock/&gt; (octet 3 bit 0 not set) &lt;SimpleBlock/&gt; (octet 3 bit 0 not set)
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
<ul spacing="compact"> <!-- [rfced] We updated the end tag as follows in two blocks of XML in
<li>Same frame that references another frame put inside a BlockGroup to add <tt> Section 10.4. Please review.
BlockDuration</tt>, with the EBML tree shown as XML:</li>
</ul> Original:
<BlockDuration>20<BlockDuration>
Perhaps:
<BlockDuration>20</BlockDuration>
-->
<t>Same frame that references another frame put inside a BlockGroup to add <tt>B
lockDuration</tt>, with the EBML tree shown as XML:</t>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;BlockGroup&gt; &lt;BlockGroup&gt;
&lt;!-- ReferenceBlock value recovered based on the codec --&gt; &lt;!-- ReferenceBlock value recovered based on the codec --&gt;
&lt;ReferenceBlock&gt;-40&lt;/ReferenceBlock&gt; &lt;ReferenceBlock&gt;-40&lt;/ReferenceBlock&gt;
&lt;BlockDuration&gt;20&lt;BlockDuration&gt; &lt;BlockDuration&gt;20&lt;/BlockDuration&gt;
&lt;Block/&gt; &lt;Block/&gt;
&lt;/BlockGroup&gt; &lt;/BlockGroup&gt;
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
<t>When a frame in a <tt>BlockGroup</tt> is not a RAP, the <tt>BlockGroup</tt> < bcp14>MUST</bcp14> contain at least a <tt>ReferenceBlock</tt>. <t>When a frame in a <tt>BlockGroup</tt> is not a RAP, the <tt>BlockGroup</tt> < bcp14>MUST</bcp14> contain at least a <tt>ReferenceBlock</tt>.
The <tt>ReferenceBlock</tt>s <bcp14>MUST</bcp14> be used in one of the following ways:</t> The <tt>ReferenceBlock</tt>s <bcp14>MUST</bcp14> be used in one of the following ways:</t>
<ul spacing="compact"> <ul>
<li>each reference frame listed as a <tt>ReferenceBlock</tt>,</li> <li>each reference frame listed as a <tt>ReferenceBlock</tt>,</li>
<li>some referenced frame listed as a <tt>ReferenceBlock</tt>, even if the times <li>some referenced frames listed as a <tt>ReferenceBlock</tt>, even if the time
tamp value is accurate,</li> stamp value is accurate, or</li>
<li>or one <tt>ReferenceBlock</tt> with the timestamp value &quot;0&quot; corres <li>one <tt>ReferenceBlock</tt> with the timestamp value "0" corresponding to a
ponding to a self or unknown reference.</li> self or unknown reference.</li>
</ul> </ul>
<t>The lack of <tt>ReferenceBlock</tt> would mean such a frame is a RAP and seek <t>The lack of <tt>ReferenceBlock</tt> would mean such a frame is a RAP, and see
ing on that king on that
frame that actually depends on other frames may create bogus output or even cras frame that actually depends on other frames may create a bogus output or even cr
h.</t> ash.</t>
<ul spacing="compact"> <t>Same frame that references another frame put inside a BlockGroup, but the ref
<li>Same frame that references another frame put inside a BlockGroup but the ref erence could not be recovered, with the EBML tree shown as XML:</t>
erence could not be recovered, with the EBML tree shown as XML:</li>
</ul>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;BlockGroup&gt; &lt;BlockGroup&gt;
&lt;!-- ReferenceBlock value not recovered from the codec --&gt; &lt;!-- ReferenceBlock value not recovered from the codec --&gt;
&lt;ReferenceBlock&gt;0&lt;/ReferenceBlock&gt; &lt;ReferenceBlock&gt;0&lt;/ReferenceBlock&gt;
&lt;BlockDuration&gt;20&lt;BlockDuration&gt; &lt;BlockDuration&gt;20&lt;/BlockDuration&gt;
&lt;Block/&gt; &lt;Block/&gt;
&lt;/BlockGroup&gt; &lt;/BlockGroup&gt;
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
<ul spacing="compact"> <t>BlockGroup with a frame that references two other frames, with the EBML tree
<li>BlockGroup with a frame that references two other frames, with the EBML tree shown as XML:</t>
shown as XML:</li>
</ul>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;BlockGroup&gt; &lt;BlockGroup&gt;
&lt;!-- References a Block 80 Track Ticks before this one --&gt; &lt;!-- References a Block 80 Track Ticks before this one --&gt;
&lt;ReferenceBlock&gt;-80&lt;/ReferenceBlock&gt; &lt;ReferenceBlock&gt;-80&lt;/ReferenceBlock&gt;
&lt;!-- References a Block 40 Track Ticks after this one --&gt; &lt;!-- References a Block 40 Track Ticks after this one --&gt;
&lt;ReferenceBlock&gt;40&lt;/ReferenceBlock&gt; &lt;ReferenceBlock&gt;40&lt;/ReferenceBlock&gt;
&lt;Block/&gt; &lt;Block/&gt;
&lt;/BlockGroup&gt; &lt;/BlockGroup&gt;
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
<t>Intra-only video frames, such as the ones found in AV1 or VP9, can be decoded without any other <t>Intra-only video frames, such as the ones found in AV1 or VP9, can be decoded without any other
frame, but they don't reset the codec state. So seeking to these frames is not p ossible frame, but they don't reset the codec state. Thus, seeking to these frames is no t possible,
as the next frames may need frames that are not known from this seeking point. as the next frames may need frames that are not known from this seeking point.
Such intra-only frames <bcp14>MUST NOT</bcp14> be considered as keyframes so the keyframe flag Such intra-only frames <bcp14>MUST NOT</bcp14> be considered as keyframes, so th e keyframe flag
<bcp14>MUST NOT</bcp14> be set in the <tt>SimpleBlock</tt> or a <tt>ReferenceBlo ck</tt> <bcp14>MUST</bcp14> be used <bcp14>MUST NOT</bcp14> be set in the <tt>SimpleBlock</tt> or a <tt>ReferenceBlo ck</tt> <bcp14>MUST</bcp14> be used
to signify the frame is not a RAP. The timestamp value of the <tt>ReferenceBlock </tt> <bcp14>MUST</bcp14> to signify the frame is not a RAP. The timestamp value of the <tt>ReferenceBlock </tt> <bcp14>MUST</bcp14>
be &quot;0&quot;, meaning it's referencing itself.</t> be "0", meaning it's referencing itself.</t>
<ul spacing="compact"> <t>Intra-only frame not an RAP, with the EBML tree shown as XML:</t>
<li>Intra-only frame not an RAP, with the EBML tree shown as XML:</li>
</ul>
<sourcecode type="xml">&lt;Cluster&gt; <sourcecode type="xml">&lt;Cluster&gt;
&lt;Timestamp&gt;123456&lt;/Timestamp&gt; &lt;Timestamp&gt;123456&lt;/Timestamp&gt;
&lt;BlockGroup&gt; &lt;BlockGroup&gt;
&lt;!-- References itself to mark it should not be used as RAP --&gt; &lt;!-- References itself to mark it should not be used as RAP --&gt;
&lt;ReferenceBlock&gt;0&lt;/ReferenceBlock&gt; &lt;ReferenceBlock&gt;0&lt;/ReferenceBlock&gt;
&lt;Block/&gt; &lt;Block/&gt;
&lt;/BlockGroup&gt; &lt;/BlockGroup&gt;
... ...
&lt;/Cluster&gt; &lt;/Cluster&gt;
</sourcecode> </sourcecode>
<t>Because a video <tt>SimpleBlock</tt> has less references information than a v ideo <tt>BlockGroup</tt>, <t>Because a video <tt>SimpleBlock</tt> has less information on references than a video <tt>BlockGroup</tt>,
it is possible to remux a video track using <tt>BlockGroup</tt> into a <tt>Simpl eBlock</tt>, it is possible to remux a video track using <tt>BlockGroup</tt> into a <tt>Simpl eBlock</tt>,
as long as it doesn't use any other <tt>BlockGroup</tt> features than <tt>Refere nceBlock</tt>.</t> as long as it doesn't use any other <tt>BlockGroup</tt> features than <tt>Refere nceBlock</tt>.</t>
</section> </section>
</section> </section>
<section anchor="timestamps"><name>Timestamps</name> <section anchor="timestamps"><name>Timestamps</name>
<t>Historically timestamps in Matroska were mistakenly called timecodes. The <tt >Timestamp Element</tt> <t>Historically, timestamps in Matroska were mistakenly called timecodes. The <t t>Timestamp Element</tt>
was called Timecode, the <tt>TimestampScale Element</tt> was called TimecodeScal e, the was called Timecode, the <tt>TimestampScale Element</tt> was called TimecodeScal e, the
<tt>TrackTimestampScale Element</tt> was called TrackTimecodeScale and the <tt>TrackTimestampScale Element</tt> was called TrackTimecodeScale, and the
<tt>ReferenceTimestamp Element</tt> was called ReferenceTimeCode.</t> <tt>ReferenceTimestamp Element</tt> was called ReferenceTimeCode.</t>
<section anchor="timestamp-ticks"><name>Timestamp Ticks</name> <section anchor="timestamp-ticks"><name>Timestamp Ticks</name>
<t>All timestamp values in Matroska are expressed in multiples of a tick. <t>All timestamp values in Matroska are expressed in multiples of a tick.
They are usually stored as integers. They are usually stored as integers.
There are three types of ticks possible:</t>
There are three types of ticks possible: Matroska Ticks, Segment Ticks, and Trac
k Ticks.</t>
<section anchor="matroska-ticks"><name>Matroska Ticks</name> <section anchor="matroska-ticks"><name>Matroska Ticks</name>
<!-- [rfced] Will readers know what "For such elements" refers to in this
first sentence of Section 11.1.1??
Original:
For such elements, the timestamp value is stored directly in
nanoseconds.
-->
<t>For such elements, the timestamp value is stored directly in nanoseconds.</t> <t>For such elements, the timestamp value is stored directly in nanoseconds.</t>
<t>The elements storing values in Matroska Ticks/nanoseconds are:</t> <t>The elements storing values in Matroska Ticks/nanoseconds are:</t>
<ul spacing="compact"> <ul>
<li><tt>TrackEntry\DefaultDuration</tt>; defined in <xref target="defaultduratio n-element"></xref></li> <li><tt>TrackEntry\DefaultDuration</tt>; defined in <xref target="defaultduratio n-element"></xref></li>
<li><tt>TrackEntry\DefaultDecodedFieldDuration</tt>; defined in <xref target="de faultdecodedfieldduration-element"></xref></li> <li><tt>TrackEntry\DefaultDecodedFieldDuration</tt>; defined in <xref target="de faultdecodedfieldduration-element"></xref></li>
<li><tt>TrackEntry\SeekPreRoll</tt>; defined in <xref target="seekpreroll-elemen t"></xref></li> <li><tt>TrackEntry\SeekPreRoll</tt>; defined in <xref target="seekpreroll-elemen t"></xref></li>
<li><tt>TrackEntry\CodecDelay</tt>; defined in <xref target="codecdelay-element" ></xref></li> <li><tt>TrackEntry\CodecDelay</tt>; defined in <xref target="codecdelay-element" ></xref></li>
<li><tt>BlockGroup\DiscardPadding</tt>; defined in <xref target="discardpadding- element"></xref></li> <li><tt>BlockGroup\DiscardPadding</tt>; defined in <xref target="discardpadding- element"></xref></li>
<li><tt>ChapterAtom\ChapterTimeStart</tt>; defined in <xref target="chaptertimes tart-element"></xref></li> <li><tt>ChapterAtom\ChapterTimeStart</tt>; defined in <xref target="chaptertimes tart-element"></xref></li>
<li><tt>ChapterAtom\ChapterTimeEnd</tt>; defined in <xref target="chaptertimeend -element"></xref></li> <li><tt>ChapterAtom\ChapterTimeEnd</tt>; defined in <xref target="chaptertimeend -element"></xref></li>
<li><tt>CuePoint\CueTime</tt>; defined in <xref target="cuetime-element"></xref> </li> <li><tt>CuePoint\CueTime</tt>; defined in <xref target="cuetime-element"></xref> </li>
<li><tt>CueReference\CueRefTime</tt>; defined in <xref target="cuetime-element"> </xref></li> <li><tt>CueReference\CueRefTime</tt>; defined in <xref target="cuetime-element"> </xref></li>
</ul> </ul>
</section> </section>
<section anchor="segment-ticks"><name>Segment Ticks</name> <section anchor="segment-ticks"><name>Segment Ticks</name>
<t>Elements in Segment Ticks involve the use of the <tt>TimestampScale Element</ tt> of the Segment to get the timestamp <t>Elements in Segment Ticks involve the use of the <tt>TimestampScale Element</ tt> of the Segment to get the timestamp
in nanoseconds of the element, with the following formula:</t> in nanoseconds of the element, with the following formula:</t>
<artwork>timestamp in nanosecond = element value * TimestampScale <artwork>timestamp in nanosecond = element value * TimestampScale
</artwork> </artwork>
<t>This allows storing smaller integer values in the elements.</t> <t>This allows for storage of smaller integer values in the elements.</t>
<t>When using the default value of <tt>TimestampScale</tt> of &quot;1,000,000&qu <t>When using the default value of "1,000,000" for <tt>TimestampScale</tt>, one
ot;, one Segment Tick represents one millisecond.</t> Segment Tick represents one millisecond.</t>
<t>The elements storing values in Segment Ticks are:</t> <t>The elements storing values in Segment Ticks are:</t>
<ul spacing="compact"> <ul>
<li><tt>Cluster\Timestamp</tt>; defined in <xref target="timestamp-element"></xr ef></li> <li><tt>Cluster\Timestamp</tt>; defined in <xref target="timestamp-element"></xr ef></li>
<li><tt>Info\Duration</tt> is stored as a floating-point but the same formula ap plies; defined in <xref target="duration-element"></xref></li> <li><tt>Info\Duration</tt> is stored as a floating-point, but the same formula a pplies; defined in <xref target="duration-element"></xref></li>
<li><tt>CuePoint\CueTrackPositions\CueDuration</tt>; defined in <xref target="cu eduration-element"></xref></li> <li><tt>CuePoint\CueTrackPositions\CueDuration</tt>; defined in <xref target="cu eduration-element"></xref></li>
</ul> </ul>
</section> </section>
<section anchor="track-ticks"><name>Track Ticks</name> <section anchor="track-ticks"><name>Track Ticks</name>
<t>Elements in Track Ticks involve the use of the <tt>TimestampScale Element</tt > of the Segment and the <tt>TrackTimestampScale Element</tt> of the Track <t>Elements in Track Ticks involve the use of the <tt>TimestampScale Element</tt > of the Segment and the <tt>TrackTimestampScale Element</tt> of the Track
to get the timestamp in nanoseconds of the element, with the following formula:< /t> to get the timestamp in nanoseconds of the element, with the following formula:< /t>
<artwork>timestamp in nanoseconds = <artwork>timestamp in nanoseconds =
element value * TrackTimestampScale * TimestampScale element value * TrackTimestampScale * TimestampScale
</artwork> </artwork>
<t>This allows storing smaller integer values in the elements. <t>This allows for storage of smaller integer values in the elements.
The resulting floating-point values of the timestamps are still expressed in nan oseconds.</t> The resulting floating-point values of the timestamps are still expressed in nan oseconds.</t>
<t>When using the default values for <tt>TimestampScale</tt> and <tt>TrackTimest ampScale</tt> of &quot;1,000,000&quot; and of &quot;1.0&quot; respectively, one Track Tick represents one millisecond.</t> <t>When using the default values of "1,000,000" for <tt>TimestampScale</tt> and "1.0" for <tt>TrackTimestampScale</tt>, one Track Tick represents one millisecon d.</t>
<t>The elements storing values in Track Ticks are:</t> <t>The elements storing values in Track Ticks are:</t>
<ul spacing="compact"> <ul>
<li><tt>Cluster\BlockGroup\Block</tt> and <tt>Cluster\SimpleBlock</tt> timestamp s; detailed in <xref target="block-timestamps"></xref></li> <li><tt>Cluster\BlockGroup\Block</tt> and <tt>Cluster\SimpleBlock</tt> timestamp s; detailed in <xref target="block-timestamps"></xref></li>
<li><tt>Cluster\BlockGroup\BlockDuration</tt>; defined in <xref target="blockdur ation-element"></xref></li> <li><tt>Cluster\BlockGroup\BlockDuration</tt>; defined in <xref target="blockdur ation-element"></xref></li>
<li><tt>Cluster\BlockGroup\ReferenceBlock</tt>; defined in <xref target="referen ceblock-element"></xref></li> <li><tt>Cluster\BlockGroup\ReferenceBlock</tt>; defined in <xref target="referen ceblock-element"></xref></li>
</ul> </ul>
<t>When the <tt>TrackTimestampScale</tt> is interpreted as &quot;1.0&quot;, Trac k Ticks are equivalent to Segment Ticks <t>When the <tt>TrackTimestampScale</tt> is interpreted as "1.0", Track Ticks ar e equivalent to Segment Ticks
and give an integer value in nanoseconds. This is the most common case as <tt>Tr ackTimestampScale</tt> is usually omitted.</t> and give an integer value in nanoseconds. This is the most common case as <tt>Tr ackTimestampScale</tt> is usually omitted.</t>
<t>A value of <tt>TrackTimestampScale</tt> other than &quot;1.0&quot; <bcp14>MAY </bcp14> be used <t>A value of <tt>TrackTimestampScale</tt> other than "1.0" <bcp14>MAY</bcp14> b e used
to scale the timestamps more in tune with each Track sampling frequency. to scale the timestamps more in tune with each Track sampling frequency.
For historical reasons, a lot of Matroska readers don't take the <tt>TrackTimest For historical reasons, a lot of Matroska Readers don't take the <tt>TrackTimest
ampScale</tt> value in account. ampScale</tt> value into account. Thus, using a value other than "1.0" might not
So using a value other than &quot;1.0&quot; might not work in many places.</t> work in many places.</t>
</section> </section>
</section> </section>
<section anchor="block-timestamps"><name>Block Timestamps</name> <section anchor="block-timestamps"><name>Block Timestamps</name>
<t>A <tt>Block Element</tt> and <tt>SimpleBlock Element</tt> timestamp is the ti me when the decoded data of the first <t>A <tt>Block Element</tt> and <tt>SimpleBlock Element</tt> timestamp is the ti me when the decoded data of the first
frame in the Block/SimpleBlock <bcp14>MUST</bcp14> be presented, if the track of that Block/SimpleBlock is selected for playback. frame in the Block/SimpleBlock <bcp14>MUST</bcp14> be presented if the track of that Block/SimpleBlock is selected for playback.
This is also known as the Presentation Timestamp (PTS).</t> This is also known as the Presentation Timestamp (PTS).</t>
<t>The <tt>Block Element</tt> and <tt>SimpleBlock Element</tt> store their times tamps as signed integers, relative <t>The <tt>Block Element</tt> and <tt>SimpleBlock Element</tt> store their times tamps as signed integers, relative
to the <tt>Cluster\Timestamp</tt> value of the <tt>Cluster</tt> they are stored in. to the <tt>Cluster\Timestamp</tt> value of the <tt>Cluster</tt> they are stored in.
To get the timestamp of a <tt>Block</tt> or <tt>SimpleBlock</tt> in nanoseconds To get the timestamp of a <tt>Block</tt> or <tt>SimpleBlock</tt> in nanoseconds,
you have to use the following formula:</t> the following formula is used:</t>
<artwork>( Cluster\Timestamp + ( block timestamp * TrackTimestampScale ) ) * <artwork>( Cluster\Timestamp + ( block timestamp * TrackTimestampScale ) ) *
TimestampScale TimestampScale
</artwork> </artwork>
<t>The <tt>Block Element</tt> and <tt>SimpleBlock Element</tt> store their times <t>The <tt>Block Element</tt> and <tt>SimpleBlock Element</tt> store their times
tamps as 16bit signed integers, tamps as 16-bit signed integers,
allowing a range from &quot;-32768&quot; to &quot;+32767&quot; Track Ticks. allowing a range from "-32768" to "+32767" Track Ticks.
Although these values can be negative, when added to the <tt>Cluster\Timestamp</ tt>, the resulting frame timestamp <bcp14>SHOULD NOT</bcp14> be negative.</t> Although these values can be negative, when added to the <tt>Cluster\Timestamp</ tt>, the resulting frame timestamp <bcp14>SHOULD NOT</bcp14> be negative.</t>
<t>When a <tt>CodecDelay Element</tt> is set, its value <bcp14>MUST</bcp14> be s ubstracted from each Block timestamp of that track. <t>When a <tt>CodecDelay Element</tt> is set, its value <bcp14>MUST</bcp14> be s ubstracted from each Block timestamp of that track.
To get the timestamp in nanoseconds of the first frame in a <tt>Block</tt> or <t t>SimpleBlock</tt>, the formula becomes:</t> To get the timestamp in nanoseconds of the first frame in a <tt>Block</tt> or <t t>SimpleBlock</tt>, the formula becomes:</t>
<artwork>( ( Cluster\Timestamp + ( block timestamp * TrackTimestampScale ) ) * <artwork>( ( Cluster\Timestamp + ( block timestamp * TrackTimestampScale ) ) *
TimestampScale ) - CodecDelay TimestampScale ) - CodecDelay
</artwork> </artwork>
<t>The resulting frame timestamp <bcp14>SHOULD NOT</bcp14> be negative.</t> <t>The resulting frame timestamp <bcp14>SHOULD NOT</bcp14> be negative.</t>
<t>During playback, when a frame has a negative timestamp, the content <bcp14>MU ST</bcp14> be decoded by the decoder but not played to the user.</t> <t>During playback, when a frame has a negative timestamp, the content <bcp14>MU ST</bcp14> be decoded by the decoder but not played to the user.</t>
</section> </section>
<section anchor="timestampscale-rounding"><name>TimestampScale Rounding</name> <section anchor="timestampscale-rounding"><name>TimestampScale Rounding</name>
<t>The default Track Tick duration is one millisecond.</t> <t>The default Track Tick duration is one millisecond.</t>
<t>The <tt>TimestampScale</tt> is a floating-point value, which is usually 1.0. But when it's not, the multiplied <t>The <tt>TimestampScale</tt> is a floating-point value that is usually "1.0". But when it's not, the multiplied
Block Timestamp is a floating-point value in nanoseconds. Block Timestamp is a floating-point value in nanoseconds.
The <tt>Matroska Reader</tt> <bcp14>SHOULD</bcp14> use the nearest rounding valu e in nanosecond to get The <tt>Matroska Reader</tt> <bcp14>SHOULD</bcp14> use the nearest rounding valu e in nanoseconds to get
the proper nanosecond timestamp of a Block. This allows some clever <tt>Timestam pScale</tt> values the proper nanosecond timestamp of a Block. This allows some clever <tt>Timestam pScale</tt> values
to have more refined timestamp precision per frame.</t> to have a more refined timestamp precision per frame.</t>
</section> </section>
</section> </section>
<section anchor="language-codes"><name>Language Codes</name> <section anchor="language-codes"><name>Language Codes</name>
<t>Matroska from version 1 through 3 uses language codes that can be either the
3 letters <t>Matroska versions 1 through 3 use language codes that can be either the three
bibliographic ISO-639-2 form <xref target="ISO639-2"></xref> (like &quot;fre&quo -letter
t; for French), bibliographic ISO 639-2 form <xref target="ISO639-2"></xref> (like "fre" for Fre
or such a language code followed by a dash and a country code for specialities i nch)
n languages (like &quot;fre-ca&quot; for Canadian French). or such a language code followed by a dash and a country code for specialities i
The <tt>ISO 639-2 Language Elements</tt> are &quot;Language Element&quot;, &quot n languages (like "fre-ca" for Canadian French).
;TagLanguage Element&quot;, and &quot;ChapLanguage Element&quot;.</t> The <tt>ISO 639-2 Language Elements</tt> are "Language Element", "TagLanguage El
<t>Starting in Matroska version 4, either <xref target="ISO639-2"></xref> or <xr ement", and "ChapLanguage Element".</t>
ef target="BCP47"></xref> <bcp14>MAY</bcp14> be used, <t>Starting in Matroska version 4, either <xref target="ISO639-2"></xref> or <xr
although <tt>BCP 47</tt> is <bcp14>RECOMMENDED</bcp14>. The <tt>BCP 47 Language ef target="RFC5646"></xref> <bcp14>MAY</bcp14> be used,
Elements</tt> are &quot;LanguageBCP47 Element&quot;, although <tt>BCP 47</tt> is <bcp14>RECOMMENDED</bcp14>. The <tt>BCP 47 Language
&quot;TagLanguageBCP47 Element&quot;, and &quot;ChapLanguageBCP47 Element&quot;. Elements</tt> are "LanguageBCP47 Element",
If a <tt>BCP 47 Language Element</tt> and an <tt>ISO 639-2 Language Element</tt "TagLanguageBCP47 Element", and "ChapLanguageBCP47 Element". If a <tt>BCP 47 Lan
> guage Element</tt> and an <tt>ISO 639-2 Language Element</tt>
are used within the same <tt>Parent Element</tt>, then the <tt>ISO 639-2 Languag e Element</tt> <bcp14>MUST</bcp14> be ignored and precedence given to the <tt>BC P 47 Language Element</tt>.</t> are used within the same <tt>Parent Element</tt>, then the <tt>ISO 639-2 Languag e Element</tt> <bcp14>MUST</bcp14> be ignored and precedence given to the <tt>BC P 47 Language Element</tt>.</t>
</section> </section>
<section anchor="country-codes"><name>Country Codes</name> <section anchor="country-codes"><name>Country Codes</name>
<t>Country codes are the <xref target="BCP47"></xref> two-letter region subtag, without the UK exception.</t> <t>Country codes are the <xref target="RFC5646"></xref> two-letter region subtag s, without the UK exception.</t>
</section> </section>
<section anchor="encryption"><name>Encryption</name> <section anchor="encryption"><name>Encryption</name>
<!-- [rfced] How may we update "to provide authorization" to create parallel
structure for the list in this sentence? The other items in the list are
nouns (i.e., confidentiality, integrity, authenticity).
Original:
This Matroska specification provides no interoperable solution for
securing the data container with any assurances of confidentiality,
integrity, authenticity, or to provide authorization.
Perhaps:
This Matroska specification provides no interoperable solution for
securing the data container with any assurances of confidentiality,
integrity, authenticity, or authorization.
-->
<t>This Matroska specification provides no interoperable solution for securing t he <t>This Matroska specification provides no interoperable solution for securing t he
data container with any assurances of confidentiality, integrity, authenticity, data container with any assurances of confidentiality, integrity, authenticity,
or to provide authorization. The <tt>ContentEncryption Element</tt> (<xref targe t="contentencryption-element"></xref>) or to provide authorization. The <tt>ContentEncryption Element</tt> (<xref targe t="contentencryption-element"></xref>)
and associated sub-fields (<xref target="contentencalgo-element"></xref> to <xre f target="aessettingsciphermode-element"></xref>) are defined and associated sub-fields (<xref target="contentencalgo-element"></xref> to <xre f target="aessettingsciphermode-element"></xref>) are defined
only for the benefit of implementers to construct their own proprietary solution only for the benefit of implementers to construct their own proprietary solution
or as the basis for further standardization activities. How to use these or as the basis for further standardization activities. How to use these
fields to secure a Matroska data container is out of scope, as are any related fields to secure a Matroska data container is out of scope, as are any related
issues such as key management and distribution.</t> issues such as key management and distribution.</t>
<t>A <tt>Matroska Reader</tt> who encounters containers that use the fields defi ned in this <t>A <tt>Matroska Reader</tt> who encounters containers that use the fields defi ned in this
section <bcp14>MUST</bcp14> rely on out-of-scope guidance to decode the associat ed content.</t> section <bcp14>MUST</bcp14> rely on out-of-scope guidance to decode the associat ed content.</t>
skipping to change at line 6083 skipping to change at line 6721
encrypted streams without decrypting them. The streams could potentially be copi ed, encrypted streams without decrypting them. The streams could potentially be copi ed,
deleted, cut, appended, or any number of other possible editing techniques witho ut deleted, cut, appended, or any number of other possible editing techniques witho ut
decryption. The data can be used without having to expose it or go through the d ecrypting process.</t> decryption. The data can be used without having to expose it or go through the d ecrypting process.</t>
<t>Encryption can also be layered within Matroska. This means that two completel y different <t>Encryption can also be layered within Matroska. This means that two completel y different
types of encryption can be used, requiring two separate keys to be able to decry pt a stream.</t> types of encryption can be used, requiring two separate keys to be able to decry pt a stream.</t>
<t>Encryption information is stored in the <tt>ContentEncodings Element</tt> und er the <tt>ContentEncryption Element</tt>.</t> <t>Encryption information is stored in the <tt>ContentEncodings Element</tt> und er the <tt>ContentEncryption Element</tt>.</t>
<t>For encryption systems sharing public/private keys, the creation of the keys and the exchange of keys <t>For encryption systems sharing public/private keys, the creation of the keys and the exchange of keys
are not covered by this document. They have to be handled by the system using Ma troska.</t> are not covered by this document. They have to be handled by the system using Ma troska.</t>
<t>The algorithms described in <xref target="ContentEncAlgoValues"></xref> suppo rt <t>The algorithms described in <xref target="ContentEncAlgoValues"></xref> suppo rt
different modes of operations and key sizes. The specification of these different modes of operations and key sizes. The specification of these
parameters is required for a complete solution, but is out of scope of this parameters is required for a complete solution but is out of scope of this
document and left to the proprietary implementations using them or subsequent document and left to the proprietary implementations using them or subsequent
profiles of this document.</t> profiles of this document.</t>
<t>The <tt>ContentEncodingScope Element</tt> gives an idea of which part of the <t>The <tt>ContentEncodingScope Element</tt> gives an idea of which part of the
track are encrypted. track is encrypted, but each <tt>ContentEncAlgo Element</tt> and its sub-element
But each <tt>ContentEncAlgo Element</tt> and its sub elements like <tt>AESSettin s (like <tt>AESSettingsCipherMode</tt>)
gsCipherMode</tt> really define exactly how the encrypted track should be interpreted.</t>
define how the encrypted should be exactly interpreted.</t>
<t>An example of an extension that builds upon these security-related fields in this specification is <xref target="WebM-Enc"></xref>. <t>An example of an extension that builds upon these security-related fields in this specification is <xref target="WebM-Enc"></xref>.
It uses AES-CTR, <tt>ContentEncAlgo</tt> = 5 (<xref target="contentencalgo-eleme nt"></xref>) and <tt>AESSettingsCipherMode</tt> = 1 (<xref target="aessettingsci phermode-element"></xref>).</t> It uses AES-CTR, <tt>ContentEncAlgo</tt> = 5 (<xref target="contentencalgo-eleme nt"></xref>), and <tt>AESSettingsCipherMode</tt> = 1 (<xref target="aessettingsc iphermode-element"></xref>).</t>
<t>A <tt>Matroska Writer</tt> <bcp14>MUST NOT</bcp14> use insecure cryptographic algorithms to create new <t>A <tt>Matroska Writer</tt> <bcp14>MUST NOT</bcp14> use insecure cryptographic algorithms to create new
archives or streams, but a <tt>Matroska Reader</tt> <bcp14>MAY</bcp14> support t hese algorithms to read archives or streams, but a <tt>Matroska Reader</tt> <bcp14>MAY</bcp14> support t hese algorithms to read
previously made archives or stream.</t> previously made archives or streams.</t>
</section> </section>
<section anchor="image-presentation"><name>Image Presentation</name> <section anchor="image-presentation"><name>Image Presentation</name>
<section anchor="cropping"><name>Cropping</name> <section anchor="cropping"><name>Cropping</name>
<t>The <tt>PixelCrop Elements</tt> (<tt>PixelCropTop</tt>, <tt>PixelCropBottom</ tt>, <tt>PixelCropRight</tt>, and <tt>PixelCropLeft</tt>) <t>The <tt>PixelCrop Elements</tt> (<tt>PixelCropTop</tt>, <tt>PixelCropBottom</ tt>, <tt>PixelCropRight</tt>, and <tt>PixelCropLeft</tt>)
indicate when, and by how much, encoded videos frames <bcp14>SHOULD</bcp14> be c indicate when, and by how much, encoded video frames <bcp14>SHOULD</bcp14> be cr
ropped for display. opped for display.
These Elements allow edges of the frame that are not intended for display, such These Elements allow edges of the frame that are not intended for display (such
as the as the
sprockets of a full-frame film scan or the VANC area of a digitized analog video sprockets of a full-frame film scan or the VANC area of a digitized analog video
tape, tape) to be stored but hidden. <tt>PixelCropTop</tt> and <tt>PixelCropBottom</t
to be stored but hidden. <tt>PixelCropTop</tt> and <tt>PixelCropBottom</tt> stor t> store an integer of how many
e an integer of how many rows of pixels <bcp14>SHOULD</bcp14> be cropped from the top and bottom of the i
rows of pixels <bcp14>SHOULD</bcp14> be cropped from the top and bottom of the i mage, respectively.
mage (respectively).
<tt>PixelCropLeft</tt> and <tt>PixelCropRight</tt> store an integer of how many columns of pixels <tt>PixelCropLeft</tt> and <tt>PixelCropRight</tt> store an integer of how many columns of pixels
<bcp14>SHOULD</bcp14> be cropped from the left and right of the image (respecti vely).</t> <bcp14>SHOULD</bcp14> be cropped from the left and right of the image, respecti vely.</t>
<t>For example, <t>For example,
a pillar-boxed video that stores a 1440x1080 visual image within the center of a padded a pillar-boxed video that stores a 1440x1080 visual image within the center of a padded
1920x1080 encoded image may set both <tt>PixelCropLeft</tt> and <tt>PixelCropRi 1920x1080 encoded image may set both <tt>PixelCropLeft</tt> and <tt>PixelCropRi
ght</tt> to &quot;240&quot;, ght</tt> to "240",
so that a <tt>Matroska Player</tt> should crop off 240 columns of pixels from t so a <tt>Matroska Player</tt> should crop off 240 columns of pixels from the le
he left and ft and
right of the encoded image to present the image with the pillar-boxes hidden.</ t> right of the encoded image to present the image with the pillar-boxes hidden.</ t>
<t>Cropping has to be performed before resizing and the display dimensions given by <t>Cropping has to be performed before resizing and the display dimensions given by
<tt>DisplayWidth</tt>, <tt>DisplayHeight</tt> and <tt>DisplayUnit</tt> apply to the already cropped image.</t> <tt>DisplayWidth</tt>, <tt>DisplayHeight</tt>, and <tt>DisplayUnit</tt> apply t o the already-cropped image.</t>
</section> </section>
<section anchor="rotation"><name>Rotation</name> <section anchor="rotation"><name>Rotation</name>
<t>The ProjectionPoseRoll Element (see <xref target="projectionposeroll-element" ></xref>) can be used to indicate <t>The ProjectionPoseRoll Element (<xref target="projectionposeroll-element"></x ref>) can be used to indicate
that the image from the associated video track <bcp14>SHOULD</bcp14> be rotated for presentation. that the image from the associated video track <bcp14>SHOULD</bcp14> be rotated for presentation.
For instance, the following representation of the Projection Element <xref targe t="projection-element"></xref>) For instance, the following example of the Projection Element (<xref target="pr ojection-element"></xref>)
and the ProjectionPoseRoll Element represents a video track where the image <bcp 14>SHOULD</bcp14> be and the ProjectionPoseRoll Element represents a video track where the image <bcp 14>SHOULD</bcp14> be
presented with a 90-degree counter-clockwise rotation, with the EBML tree shown presented with a 90-degree counter-clockwise rotation, with the EBML tree shown
as XML :</t> as XML:</t>
<figure><name>Rotation example. <figure><name>Rotation Example
</name> </name>
<sourcecode type="xml">&lt;Projection&gt; <sourcecode type="xml">&lt;Projection&gt;
&lt;ProjectionPoseRoll&gt;90&lt;/ProjectionPoseRoll&gt; &lt;ProjectionPoseRoll&gt;90&lt;/ProjectionPoseRoll&gt;
&lt;/Projection&gt; &lt;/Projection&gt;
</sourcecode> </sourcecode>
</figure> </figure>
</section> </section>
</section> </section>
<section anchor="segment-position"><name>Segment Position</name> <section anchor="segment-position"><name>Segment Position</name>
skipping to change at line 6133 skipping to change at line 6769
</name> </name>
<sourcecode type="xml">&lt;Projection&gt; <sourcecode type="xml">&lt;Projection&gt;
&lt;ProjectionPoseRoll&gt;90&lt;/ProjectionPoseRoll&gt; &lt;ProjectionPoseRoll&gt;90&lt;/ProjectionPoseRoll&gt;
&lt;/Projection&gt; &lt;/Projection&gt;
</sourcecode> </sourcecode>
</figure> </figure>
</section> </section>
</section> </section>
<section anchor="segment-position"><name>Segment Position</name> <section anchor="segment-position"><name>Segment Position</name>
<t>The <tt>Segment Position</tt> of an <tt>Element</tt> refers to the position o f the first octet of the <t>The <tt>Segment Position</tt> of an <tt>Element</tt> refers to the position o f the first octet of the
<tt>Element ID</tt> of that <tt>Element</tt>, measured in octets, from the begin ning of the <tt>Element Data</tt> <tt>Element ID</tt> of that <tt>Element</tt>, measured in octets, from the begin ning of the <tt>Element Data</tt>
section of the containing <tt>Segment Element</tt>. In other words, the <tt>Segm ent Position</tt> of an section of the containing <tt>Segment Element</tt>. In other words, the <tt>Segm ent Position</tt> of an
<tt>Element</tt> is the distance in octets from the beginning of its containing <tt>Segment Element</tt> <tt>Element</tt> is the distance in octets from the beginning of its containing <tt>Segment Element</tt>
minus the size of the <tt>Element ID</tt> and <tt>Element Data Size</tt> of that <tt>Segment Element</tt>. minus the size of the <tt>Element ID</tt> and <tt>Element Data Size</tt> of that <tt>Segment Element</tt>.
The <tt>Segment Position</tt> of the first <tt>Child Element</tt> of the <tt>Seg ment Element</tt> is 0. The <tt>Segment Position</tt> of the first <tt>Child Element</tt> of the <tt>Seg ment Element</tt> is 0.
An <tt>Element</tt> which is not stored within a <tt>Segment Element</tt>, such as the <tt>Elements</tt> of An <tt>Element</tt> that is not stored within a <tt>Segment Element</tt>, such a s the <tt>Elements</tt> of
the <tt>EBML Header</tt>, do not have a <tt>Segment Position</tt>.</t> the <tt>EBML Header</tt>, do not have a <tt>Segment Position</tt>.</t>
<section anchor="segment-position-exception"><name>Segment Position Exception</n ame> <section anchor="segment-position-exception"><name>Segment Position Exception</n ame>
<t><tt>Elements</tt> that are defined to store a <tt>Segment Position</tt> <bcp1 4>MAY</bcp14> define reserved values to <t><tt>Elements</tt> that are defined to store a <tt>Segment Position</tt> <bcp1 4>MAY</bcp14> define reserved values to
indicate a special meaning.</t> indicate a special meaning.</t>
</section> </section>
<section anchor="example-of-segment-position"><name>Example of Segment Position< /name> <section anchor="example-of-segment-position"><name>Example of Segment Position< /name>
<t>This table presents an example of <tt>Segment Position</tt> by showing a hexa decimal representation <t>This table presents an example of <tt>Segment Position</tt> by showing a hexa decimal representation
of a very small Matroska file with labels to show the offsets in octets. The fil e contains of a very small Matroska file with labels to show the offsets in octets. The fil e contains
a <tt>Segment Element</tt> with an <tt>Element ID</tt> of &quot;0x18538067&quot; and a <tt>MuxingApp Element</tt> with an <tt>Element ID</tt> of &quot;0x4D80&qu ot;.</t> a <tt>Segment Element</tt> with an <tt>Element ID</tt> of "0x18538067" and a <tt >MuxingApp Element</tt> with an <tt>Element ID</tt> of "0x4D80".</t>
<artwork> 0 1 2 <artwork>
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 0 1 2
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
0 |1A|45|DF|A3|8B|42|82|88|6D|61|74|72|6F|73|6B|61| +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
^ EBML Header 0 |1A|45|DF|A3|8B|42|82|88|6D|61|74|72|6F|73|6B|61|
0 | |18|53|80|67| ^ EBML Header
^ Segment ID 0 | |18|53|80|67|
20 |93| ^ Segment ID
^ Segment Data Size 20 |93|
20 | |15|49|A9|66|8E|4D|80|84|69|65|74|66|57|41|84|69|65|74|66| ^ Segment Data Size
^ Start of Segment data 20 | |15|49|A9|66|8E|4D|80|84|69|65|74|66|57|41|84|69|65|74|66|
20 | |4D|80|84|69|65|74|66|57|41|84|69|65|74|66| ^ Start of Segment data
^ MuxingApp start 20 | |4D|80|84|69|65|74|66|57|41|84|69|65|74|66|
^ MuxingApp start
</artwork> </artwork>
<t>In the above example, the <tt>Element ID</tt> of the <tt>Segment Element</tt> is stored at offset 16, <t>In the above example, the <tt>Element ID</tt> of the <tt>Segment Element</tt> is stored at offset 16,
the <tt>Element Data Size</tt> of the <tt>Segment Element</tt> is stored at offs et 20, and the the <tt>Element Data Size</tt> of the <tt>Segment Element</tt> is stored at offs et 20, and the
<tt>Element Data</tt> of the <tt>Segment Element</tt> is stored at offset 21.</t > <tt>Element Data</tt> of the <tt>Segment Element</tt> is stored at offset 21.</t >
<t>The <tt>MuxingApp Element</tt> is stored at offset 26. Since the <tt>Segment Position</tt> of <t>The <tt>MuxingApp Element</tt> is stored at offset 26. Since the <tt>Segment Position</tt> of
an <tt>Element</tt> is calculated by subtracting the position of the <tt>Element Data</tt> of an <tt>Element</tt> is calculated by subtracting the position of the <tt>Element Data</tt> of
the containing <tt>Segment Element</tt> from the position of that <tt>Element</t t>, the <tt>Segment Position</tt> the containing <tt>Segment Element</tt> from the position of that <tt>Element</t t>, the <tt>Segment Position</tt>
of <tt>MuxingApp Element</tt> in the above example is '26 - 21' or '5'.</t> of the <tt>MuxingApp Element</tt> in the above example is "26 - 21" or "5".</t>
</section> </section>
</section> </section>
<section anchor="linked-segments"><name>Linked Segments</name> <section anchor="linked-segments"><name>Linked Segments</name>
<t>Matroska provides several methods to link two or more <tt>Segment Elements</t t> together to create <t>Matroska provides several methods to link two or more <tt>Segment Elements</t t> together to create
a <tt>Linked Segment</tt>. A <tt>Linked Segment</tt> is a set of multiple <tt>Se gments</tt> linked together into a <tt>Linked Segment</tt>. A <tt>Linked Segment</tt> is a set of multiple <tt>Se gments</tt> linked together into
a single presentation by using Hard Linking or Medium Linking.</t> a single presentation by using Hard Linking or Medium Linking.</t>
<t>All <tt>Segments</tt> within a <tt>Linked Segment</tt> <bcp14>MUST</bcp14> ha ve a <tt>SegmentUUID</tt>.</t> <t>All <tt>Segments</tt> within a <tt>Linked Segment</tt> <bcp14>MUST</bcp14> ha ve a <tt>SegmentUUID</tt>.</t>
<t>All <tt>Segments</tt> within a <tt>Linked Segment</tt> <bcp14>SHOULD</bcp14> be stored within the same directory <t>All <tt>Segments</tt> within a <tt>Linked Segment</tt> <bcp14>SHOULD</bcp14> be stored within the same directory
or be accessible quickly based on their <tt>SegmentUUID</tt> or be quickly accessible based on their <tt>SegmentUUID</tt>
in order to have seamless transition between segments.</t> in order to have a seamless transition between segments.</t>
<t>All <tt>Segments</tt> within a <tt>Linked Segment</tt> <bcp14>MAY</bcp14> set a <tt>SegmentFamily</tt> with a common value to make <t>All <tt>Segments</tt> within a <tt>Linked Segment</tt> <bcp14>MAY</bcp14> set a <tt>SegmentFamily</tt> with a common value to make
it easier for a <tt>Matroska Player</tt> to know which <tt>Segments</tt> are mea nt to be played together.</t> it easier for a <tt>Matroska Player</tt> to know which <tt>Segments</tt> are mea nt to be played together.</t>
<t>The <tt>SegmentFilename</tt>, <tt>PrevFilename</tt> and <tt>NextFilename</tt> <t>The <tt>SegmentFilename</tt>, <tt>PrevFilename</tt>, and <tt>NextFilename</tt
elements <bcp14>MAY</bcp14> also give hints on > elements <bcp14>MAY</bcp14> also give hints on
the original filenames that were used when the Segment links were created, in ca the original filenames that were used when the Segment links were created, in ca
se some <tt>SegmentUUID</tt> are damaged.</t> se some <tt>SegmentUUIDs</tt> are damaged.</t>
<section anchor="hard-linking"><name>Hard Linking</name> <section anchor="hard-linking"><name>Hard Linking</name>
<t>Hard Linking, also called splitting, is the process of creating a <tt>Linked Segment</tt> <t>Hard Linking, also called "splitting", is the process of creating a <tt>Linke d Segment</tt>
by linking multiple <tt>Segment Elements</tt> using the <tt>NextUUID</tt> and <t t>PrevUUID</tt> Elements.</t> by linking multiple <tt>Segment Elements</tt> using the <tt>NextUUID</tt> and <t t>PrevUUID</tt> Elements.</t>
<t>All <tt>Segments</tt> within a <tt>Hard Linked Segment</tt> <bcp14>MUST</bcp1 4> use the same <tt>Tracks</tt> list and <tt>TimestampScale</tt>.</t> <t>All <tt>Segments</tt> within a <tt>Hard Linked Segment</tt> <bcp14>MUST</bcp1 4> use the same <tt>Tracks</tt> list and <tt>TimestampScale</tt>.</t>
<t>Within a <tt>Linked Segment</tt>, the timestamps of <tt>Block</tt> and <tt>Si mpleBlock</tt> <bcp14>MUST</bcp14> follow consecutively <t>Within a <tt>Linked Segment</tt>, the timestamps of <tt>Block</tt> and <tt>Si mpleBlock</tt> <bcp14>MUST</bcp14> consecutively follow
the timestamps of <tt>Block</tt> and <tt>SimpleBlock</tt> from the previous <tt> Segment</tt> in linking order.</t> the timestamps of <tt>Block</tt> and <tt>SimpleBlock</tt> from the previous <tt> Segment</tt> in linking order.</t>
<t>With Hard Linking, the chapters of any <tt>Segment</tt> within the <tt>Linked Segment</tt> <bcp14>MUST</bcp14> only reference the current <tt>Segment</tt>. <t>With Hard Linking, the chapters of any <tt>Segment</tt> within the <tt>Linked Segment</tt> <bcp14>MUST</bcp14> only reference the current <tt>Segment</tt>.
The <tt>NextUUID</tt> and <tt>PrevUUID</tt> reference the respective <tt>Segment UUID</tt> values of the next and previous <tt>Segments</tt>.</t> The <tt>NextUUID</tt> and <tt>PrevUUID</tt> reference the respective <tt>Segment UUID</tt> values of the next and previous <tt>Segments</tt>.</t>
<t>The first <tt>Segment</tt> of a <tt>Linked Segment</tt> <bcp14>MUST NOT</bcp1 4> have a <tt>PrevUUID Element</tt>. <t>The first <tt>Segment</tt> of a <tt>Linked Segment</tt> <bcp14>MUST NOT</bcp1 4> have a <tt>PrevUUID Element</tt>.
The last <tt>Segment</tt> of a <tt>Linked Segment</tt> <bcp14>MUST NOT</bcp14> h ave a <tt>NextUUID Element</tt>.</t> The last <tt>Segment</tt> of a <tt>Linked Segment</tt> <bcp14>MUST NOT</bcp14> h ave a <tt>NextUUID Element</tt>.</t>
<t>For each node of the chain of <tt>Segments</tt> of a <tt>Linked Segment</tt>
at least one <tt>Segment</tt> <bcp14>MUST</bcp14> reference the other <tt>Segmen <t>For each node of the chain of <tt>Segments</tt> of a <tt>Linked Segment</tt>,
t</tt> within the chain.</t> at least one <tt>Segment</tt> <bcp14>MUST</bcp14> reference the other <tt>Segme
<t>In a chain of <tt>Segments</tt> of a <tt>Linked Segment</tt> the <tt>NextUUID nt</tt> within the chain.</t>
</tt> always takes precedence over the <tt>PrevUUID</tt>. <t>In a chain of <tt>Segments</tt> of a <tt>Linked Segment</tt>, the <tt>NextUUI
So if SegmentA has a <tt>NextUUID</tt> to SegmentB and SegmentB has a <tt>PrevUU D</tt> always takes precedence over the <tt>PrevUUID</tt>.
ID</tt> to SegmentC, Thus, if SegmentA has a <tt>NextUUID</tt> to SegmentB and SegmentB has a <tt>Pre
the link to use is <tt>NextUUID</tt> between SegmentA and SegmentB, SegmentC is vUUID</tt> to SegmentC,
not part of the Linked Segment.</t> the link to use is <tt>NextUUID</tt> between SegmentA and SegmentB, and SegmentC
<t>If SegmentB has a <tt>PrevUUID</tt> to SegmentA but SegmentA has no <tt>NextU is not part of the Linked Segment.</t>
UID</tt>, then the Matroska Player <t>If SegmentB has a <tt>PrevUUID</tt> to SegmentA, but SegmentA has no <tt>Next
UUID</tt>, then the Matroska Player
<bcp14>MAY</bcp14> consider these two Segments linked as SegmentA followed by Se gmentB.</t> <bcp14>MAY</bcp14> consider these two Segments linked as SegmentA followed by Se gmentB.</t>
<t>As an example, three <tt>Segments</tt> can be Hard Linked as a <tt>Linked Seg ment</tt> through <t>As an example, three <tt>Segments</tt> can be Hard Linked as a <tt>Linked Seg ment</tt> through
cross-referencing each other with <tt>SegmentUUID</tt>, <tt>PrevUUID</tt>, and < tt>NextUUID</tt>, as in this table:</t> cross-referencing each other with <tt>SegmentUUID</tt>, <tt>PrevUUID</tt>, and < tt>NextUUID</tt> as shown in this table:</t>
<table anchor="hardLinkingUIDs"><name>Usual Hard Linking UIDs</name> <table anchor="hardLinkingUIDs"><name>Usual Hard Linking UIDs</name>
<thead> <thead>
<tr> <tr>
<th align="left">file name</th> <th align="left">file name</th>
<th align="left"><tt>SegmentUUID</tt></th> <th align="left"><tt>SegmentUUID</tt></th>
<th align="left"><tt>PrevUUID</tt></th> <th align="left"><tt>PrevUUID</tt></th>
<th align="left"><tt>NextUUID</tt></th> <th align="left"><tt>NextUUID</tt></th>
</tr> </tr>
</thead> </thead>
skipping to change at line 6239 skipping to change at line 6878
<td align="left">6c92285fa6d3e827 b198d120ea3ac674</td> <td align="left">6c92285fa6d3e827 b198d120ea3ac674</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>end.mkv</tt></td> <td align="left"><tt>end.mkv</tt></td>
<td align="left">6c92285fa6d3e827 b198d120ea3ac674</td> <td align="left">6c92285fa6d3e827 b198d120ea3ac674</td>
<td align="left">a77b3598941cb803 eac0fcdafe44fac9</td> <td align="left">a77b3598941cb803 eac0fcdafe44fac9</td>
<td align="left">Invalid</td> <td align="left">Invalid</td>
</tr> </tr>
</tbody> </tbody>
</table><t>An other example where only the <tt>NextUUID</tt> Element is used:</t > </table><t>An example where only the <tt>NextUUID</tt> Element is used:</t>
<table anchor="hardLinkingWoPrevUUID"><name>Hard Linking without PrevUUID</name> <table anchor="hardLinkingWoPrevUUID"><name>Hard Linking without PrevUUID</name>
<thead> <thead>
<tr> <tr>
<th align="left">file name</th> <th align="left">file name</th>
<th align="left"><tt>SegmentUUID</tt></th> <th align="left"><tt>SegmentUUID</tt></th>
<th align="left"><tt>PrevUUID</tt></th> <th align="left"><tt>PrevUUID</tt></th>
<th align="left"><tt>NextUUID</tt></th> <th align="left"><tt>NextUUID</tt></th>
</tr> </tr>
</thead> </thead>
skipping to change at line 6305 skipping to change at line 6944
<td align="left">n/a</td> <td align="left">n/a</td>
</tr> </tr>
<tr> <tr>
<td align="left"><tt>end.mkv</tt></td> <td align="left"><tt>end.mkv</tt></td>
<td align="left">6c92285fa6d3e827 b198d120ea3ac674</td> <td align="left">6c92285fa6d3e827 b198d120ea3ac674</td>
<td align="left">a77b3598941cb803 eac0fcdafe44fac9</td> <td align="left">a77b3598941cb803 eac0fcdafe44fac9</td>
<td align="left">Invalid</td> <td align="left">Invalid</td>
</tr> </tr>
</tbody> </tbody>
</table><t>In this example only the <tt>middle.mkv</tt> is using the <tt>PrevUUI </table><t>An example where only the <tt>middle.mkv</tt> is using the <tt>PrevUU
D</tt> and <tt>NextUUID</tt> Elements:</t> ID</tt> and <tt>NextUUID</tt> Elements:</t>
<table anchor="hardLinkingMixedUIDs"><name>Hard Linking with mixed UID links</na <table anchor="hardLinkingMixedUIDs"><name>Hard Linking with Mixed UID Links</na
me> me>
<thead> <thead>
<tr> <tr>
<th align="left">file name</th> <th align="left">file name</th>
<th align="left"><tt>SegmentUUID</tt></th> <th align="left"><tt>SegmentUUID</tt></th>
<th align="left"><tt>PrevUUID</tt></th> <th align="left"><tt>PrevUUID</tt></th>
<th align="left"><tt>NextUUID</tt></th> <th align="left"><tt>NextUUID</tt></th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
skipping to change at line 6348 skipping to change at line 6987
</table></section> </table></section>
<section anchor="medium-linking"><name>Medium Linking</name> <section anchor="medium-linking"><name>Medium Linking</name>
<t>Medium Linking creates relationships between <tt>Segments</tt> using Ordered Chapters (<xref target="editionflagordered"></xref>) and the <t>Medium Linking creates relationships between <tt>Segments</tt> using Ordered Chapters (<xref target="editionflagordered"></xref>) and the
<tt>ChapterSegmentUUID Element</tt>. A <tt>Chapter Edition</tt> with Ordered Cha pters <bcp14>MAY</bcp14> contain <tt>ChapterSegmentUUID Element</tt>. A <tt>Chapter Edition</tt> with Ordered Cha pters <bcp14>MAY</bcp14> contain
Chapter elements that reference timestamp ranges from other <tt>Segments</tt>. T he <tt>Segment</tt> Chapter elements that reference timestamp ranges from other <tt>Segments</tt>. T he <tt>Segment</tt>
referenced by the Ordered Chapter via the <tt>ChapterSegmentUUID Element</tt> <b cp14>SHOULD</bcp14> be played as referenced by the Ordered Chapter via the <tt>ChapterSegmentUUID Element</tt> <b cp14>SHOULD</bcp14> be played as
part of a Linked Segment.</t> part of a Linked Segment.</t>
<t>The timestamps of Segment content referenced by Ordered Chapters <t>The timestamps of Segment content referenced by Ordered Chapters
<bcp14>MUST</bcp14> be adjusted according to the cumulative duration of the prev ious Ordered Chapters.</t> <bcp14>MUST</bcp14> be adjusted according to the cumulative duration of the prev ious Ordered Chapters.</t>
<t>As an example a file named <tt>intro.mkv</tt> could have a <tt>SegmentUUID</t t> of &quot;0xb16a58609fc7e60653a60c984fc11ead&quot;. <t>As an example, a file named <tt>intro.mkv</tt> could have a <tt>SegmentUUID</ tt> of "0xb16a58609fc7e60653a60c984fc11ead".
Another file called <tt>program.mkv</tt> could use a Chapter Edition that contai ns two Ordered Chapters. Another file called <tt>program.mkv</tt> could use a Chapter Edition that contai ns two Ordered Chapters.
The first chapter references the <tt>Segment</tt> of <tt>intro.mkv</tt> with the use of a <tt>ChapterSegmentUUID</tt>, The first chapter references the <tt>Segment</tt> of <tt>intro.mkv</tt> with the use of a <tt>ChapterSegmentUUID</tt>,
<tt>ChapterSegmentEditionUID</tt>, <tt>ChapterTimeStart</tt>, and optionally a < tt>ChapterTimeEnd</tt> element. <tt>ChapterSegmentEditionUID</tt>, <tt>ChapterTimeStart</tt>, and an optional <t t>ChapterTimeEnd</tt> element.
The second chapter references content within the <tt>Segment</tt> of <tt>program .mkv</tt>. A <tt>Matroska Player</tt> The second chapter references content within the <tt>Segment</tt> of <tt>program .mkv</tt>. A <tt>Matroska Player</tt>
<bcp14>SHOULD</bcp14> recognize the <tt>Linked Segment</tt> created by the use o f <tt>ChapterSegmentUUID</tt> in an enabled <bcp14>SHOULD</bcp14> recognize the <tt>Linked Segment</tt> created by the use o f <tt>ChapterSegmentUUID</tt> in an enabled
<tt>Edition</tt> and present the reference content of the two <tt>Segments</tt> as a single presentation.</t> <tt>Edition</tt> and present the reference content of the two <tt>Segments</tt> as a single presentation.</t>
<t>The <tt>ChapterSegmentUUID</tt> represents the Segment that holds the content to play in place of the <tt>Linked Chapter</tt>. <t>The <tt>ChapterSegmentUUID</tt> represents the Segment that holds the content to play in place of the <tt>Linked Chapter</tt>.
The <tt>ChapterSegmentUUID</tt> <bcp14>MUST NOT</bcp14> be the <tt>SegmentUUID</ tt> of its own <tt>Segment</tt>.</t> The <tt>ChapterSegmentUUID</tt> <bcp14>MUST NOT</bcp14> be the <tt>SegmentUUID</ tt> of its own <tt>Segment</tt>.</t>
<t>There are 2 ways to use a chapter link:</t>
<t>There are two ways to use a chapter link:</t>
<ul> <ul>
<li><t>Linked-Duration linking,</t> <li><t>Linked-Duration linking</t>
</li> </li>
<li><t>Linked-Edition linking</t> <li><t>Linked-Edition linking</t>
</li> </li>
</ul> </ul>
<section anchor="linked-duration"><name>Linked-Duration</name> <section anchor="linked-duration"><name>Linked-Duration</name>
<t>A <tt>Matroska Player</tt> <bcp14>MUST</bcp14> play the content of the linked Segment <t>A <tt>Matroska Player</tt> <bcp14>MUST</bcp14> play the content of the linked Segment
from the <tt>ChapterTimeStart</tt> until <tt>ChapterTimeEnd</tt> timestamp in pl ace of the <tt>Linked Chapter</tt>.</t> from the <tt>ChapterTimeStart</tt> until the <tt>ChapterTimeEnd</tt> timestamp i n place of the <tt>Linked Chapter</tt>.</t>
<t><tt>ChapterTimeStart</tt> and <tt>ChapterTimeEnd</tt> represent timestamps in the Linked Segment matching the value of <tt>ChapterSegmentUUID</tt>. <t><tt>ChapterTimeStart</tt> and <tt>ChapterTimeEnd</tt> represent timestamps in the Linked Segment matching the value of <tt>ChapterSegmentUUID</tt>.
Their values <bcp14>MUST</bcp14> be in the range of the linked Segment duration. </t> Their values <bcp14>MUST</bcp14> be in the range of the linked Segment duration. </t>
<t>The <tt>ChapterTimeEnd</tt> value <bcp14>MUST</bcp14> be set when using linke d-duration chapter linking. <t>The <tt>ChapterTimeEnd</tt> value <bcp14>MUST</bcp14> be set when using Linke d-Duration chapter linking.
<tt>ChapterSegmentEditionUID</tt> <bcp14>MUST NOT</bcp14> be set.</t> <tt>ChapterSegmentEditionUID</tt> <bcp14>MUST NOT</bcp14> be set.</t>
</section> </section>
<section anchor="linked-edition"><name>Linked-Edition</name> <section anchor="linked-edition"><name>Linked-Edition</name>
<t>A <tt>Matroska Player</tt> <bcp14>MUST</bcp14> play the whole linked <tt>Edit ion</tt> of the linked Segment in place of the <tt>Linked Chapter</tt>.</t> <t>A <tt>Matroska Player</tt> <bcp14>MUST</bcp14> play the whole Linked <tt>Edit ion</tt> of the linked Segment in place of the <tt>Linked Chapter</tt>.</t>
<t><tt>ChapterSegmentEditionUID</tt> represents a valid Edition from the Linked Segment matching the value of <tt>ChapterSegmentUUID</tt>.</t> <t><tt>ChapterSegmentEditionUID</tt> represents a valid Edition from the Linked Segment matching the value of <tt>ChapterSegmentUUID</tt>.</t>
<t>When using linked-edition chapter linking. <tt>ChapterTimeEnd</tt> is <bcp14> OPTIONAL</bcp14>.</t> <t>When using Linked-Edition chapter linking, <tt>ChapterTimeEnd</tt> is <bcp14> OPTIONAL</bcp14>.</t>
</section> </section>
</section> </section>
</section> </section>
<section anchor="track-flags"><name>Track Flags</name> <section anchor="track-flags"><name>Track Flags</name>
<section anchor="default-flag"><name>Default flag</name> <!-- [rfced] In Sections 18 and 19, would it be helpful for the names of the
<t>The &quot;default track&quot; flag is a hint for a <tt>Matroska Player</tt> i flags to align more closely with those in Sections 5.1.4.1.4 to
ndicating that a given track 5.1.4.1.11? Or is the current okay? We are specifically asking about the
following flags (the others match).
Original (in Sections 18 and 19):
hearing-impaired flag
visual-impaired flag
descriptions flag
Current:
Hearing-Impaired flag
Visual-Impaired flag
Descriptions flag
Perhaps:
HearingImpaired flag
VisualImpaired flag
TextDescriptions flag
Note that we see both "default track flag" and "Default flag" in the text. We
updated to "Default flag" for consistency.
-->
<section anchor="default-flag"><name>Default Flag</name>
<t>The Default flag is a hint for a <tt>Matroska Player</tt> indicating that a g
iven track
<bcp14>SHOULD</bcp14> be eligible to be automatically selected as the default tr ack for a given <bcp14>SHOULD</bcp14> be eligible to be automatically selected as the default tr ack for a given
language. If no tracks in a given language have the default track flag set, then all tracks language. If no tracks in a given language have the Default flag set, then all t racks
in that language are eligible for automatic selection. This can be used to indic ate that in that language are eligible for automatic selection. This can be used to indic ate that
a track provides &quot;regular service&quot; suitable for users with default set a track provides "regular service" that is suitable for users with default setti
tings, as opposed to ngs, as opposed to
specialized services, such as commentary, hearing-impaired captions, or descript specialized services, such as commentary, captions for users with hearing impair
ive audio.</t> ments, or descriptive audio.</t>
<t>The <tt>Matroska Player</tt> <bcp14>MAY</bcp14> override the &quot;default tr <t>The <tt>Matroska Player</tt> <bcp14>MAY</bcp14> override the Default flag for
ack&quot; flag for any reason, including any reason, including
user preferences to prefer tracks providing accessibility services.</t> user preferences to prefer tracks providing accessibility services.</t>
</section> </section>
<section anchor="forced-flag"><name>Forced flag</name> <section anchor="forced-flag"><name>Forced Flag</name>
<t>The &quot;forced&quot; flag tells the <tt>Matroska Player</tt> that it <bcp14 <t>The Forced flag tells the <tt>Matroska Player</tt> that it <bcp14>SHOULD</bcp
>SHOULD</bcp14> display this subtitle track, 14> display this subtitle track,
even if user preferences usually would not call for any subtitles to be displaye d alongside even if user preferences usually would not call for any subtitles to be displaye d alongside
the current selected audio track. This can be used to indicate that a track cont the audio track that is currently selected. This can be used to indicate that a
ains translations track contains translations
of onscreen text, or of dialogue spoken in a different language than the track's of on-screen text or dialogue spoken in a different language than the track's pr
primary one.</t> imary language.</t>
</section> </section>
<section anchor="hearing-impaired-flag"><name>Hearing-impaired flag</name> <section anchor="hearing-impaired-flag"><name>Hearing-Impaired Flag</name>
<t>The &quot;hearing impaired&quot; flag tells the <tt>Matroska Player</tt> that <t>The Hearing-Impaired flag tells the <tt>Matroska Player</tt> that it <bcp14>S
it <bcp14>SHOULD</bcp14> prefer this track HOULD</bcp14> prefer this track
when selecting a default track for a hearing-impaired user, and that it <bcp14>M when selecting a default track for a user with a hearing impairment and that it
AY</bcp14> prefer to select <bcp14>MAY</bcp14> prefer to select
a different track when selecting a default track for a non-hearing-impaired user a different track when selecting a default track for a user that is not hearing-
.</t> impaired.</t>
</section> </section>
<section anchor="visual-impaired-flag"><name>Visual-impaired flag</name> <section anchor="visually-impaired-flag"><name>Visual-Impaired Flag</name>
<t>The &quot;visual impaired&quot; flag tells the <tt>Matroska Player</tt> that <t>The Visual-Impaired flag tells the <tt>Matroska Player</tt> that it <bcp14>SH
it <bcp14>SHOULD</bcp14> prefer this track OULD</bcp14> prefer this track
when selecting a default track for a visually-impaired user, and that it <bcp14> when selecting a default track for a user with a visual impairment and that it <
MAY</bcp14> prefer to select bcp14>MAY</bcp14> prefer to select
a different track when selecting a default track for a non-visually-impaired use a different track when selecting a default track for a user that is not visually
r.</t> impaired.</t>
</section> </section>
<section anchor="descriptions-flag"><name>Descriptions flag</name> <section anchor="descriptions-flag"><name>Descriptions Flag</name>
<t>The &quot;descriptions&quot; flag tells the <tt>Matroska Player</tt> that thi <t>The Descriptions flag tells the <tt>Matroska Player</tt> that this track
s track is suitable to play via is suitable to play via a text-to-speech system for a user with a visual impairm
a text-to-speech system for a visually-impaired user, and that it <bcp14>SHOULD ent
NOT</bcp14> automatically and that it <bcp14>SHOULD NOT</bcp14> automatically select this track when
select this track when selecting a default track for a non-visually-impaired use selecting a default track for a user that is not visually impaired.</t>
r.</t>
</section> </section>
<section anchor="original-flag"><name>Original flag</name> <section anchor="original-flag"><name>Original Flag</name>
<t>The &quot;original&quot; flag tells the <tt>Matroska Player</tt> that this tr <t>The Original flag tells the <tt>Matroska Player</tt> that this track is in th
ack is in the original language, e original language
and that it <bcp14>SHOULD</bcp14> prefer it if configured to prefer original-lan and that it <bcp14>SHOULD</bcp14> prefer the original language if configured to
guage tracks of this prefer original-language tracks of this
track's type.</t> track's type.</t>
</section> </section>
<section anchor="commentary-flag"><name>Commentary flag</name> <section anchor="commentary-flag"><name>Commentary Flag</name>
<t>The &quot;commentary&quot; flag tells the <tt>Matroska Player</tt> that this <t>The Commentary flag tells the <tt>Matroska Player</tt> that this track contai
track contains commentary on ns commentary on
the content.</t> the content.</t>
</section> </section>
<section anchor="track-operation"><name>Track Operation</name> <section anchor="track-operation"><name>Track Operation</name>
<t><tt>TrackOperation</tt> allows combining multiple tracks to make a virtual on <t><tt>TrackOperation</tt> allows for the combination of multiple tracks to make
e. It uses a virtual one. It uses
two separate system to combine tracks. One to create a 3D &quot;composition&quot two separate system to combine tracks. One to create a 3D "composition" (left/ri
; (left/right/background planes) ght/background planes)
and one to simplify join two tracks together to make a single track.</t> and one to simplify join two tracks together to make a single track.</t>
<t>A track created with <tt>TrackOperation</tt> is a proper track with a UID and all its flags. <t>A track created with <tt>TrackOperation</tt> is a proper track with a UID and all its flags.
However, the codec ID is meaningless because each &quot;sub&quot; track needs to However, the codec ID is meaningless because each "sub" track needs to be decode
be decoded by its d by its
own decoder before the &quot;operation&quot; is applied. The <tt>Cues Elements</ own decoder before the "operation" is applied. The <tt>Cues Elements</tt> corres
tt> corresponding to such ponding to such
a virtual track <bcp14>SHOULD</bcp14> be the union of the <tt>Cues Elements</tt> for each of the tracks it's composed of (when the <tt>Cues</tt> are defined per track).</t> a virtual track <bcp14>SHOULD</bcp14> be the union of the <tt>Cues Elements</tt> for each of the tracks it's composed of (when the <tt>Cues</tt> are defined per track).</t>
<t>In the case of <tt>TrackJoinBlocks</tt>, the <tt>Block Elements</tt> (from <t t>BlockGroup</tt> and <tt>SimpleBlock</tt>) <t>In the case of <tt>TrackJoinBlocks</tt>, the <tt>Block Elements</tt> (from <t t>BlockGroup</tt> and <tt>SimpleBlock</tt>)
of all the tracks <bcp14>SHOULD</bcp14> be used as if they were defined for this new virtual <tt>Track</tt>. of all the tracks <bcp14>SHOULD</bcp14> be used as if they were defined for this new virtual <tt>Track</tt>.
When two <tt>Block Elements</tt> have overlapping start or end timestamps, it's up to the underlying When two <tt>Block Elements</tt> have overlapping start or end timestamps, it's up to the underlying
system to either drop some of these frames or render them the way they overlap. system to either drop some of these frames or render them the way they overlap.
This situation <bcp14>SHOULD</bcp14> be avoided when creating such tracks as you can never be sure This situation <bcp14>SHOULD</bcp14> be avoided when creating such tracks, as yo u can never be sure
of the end result on different platforms.</t> of the end result on different platforms.</t>
</section> </section>
<section anchor="overlay-track"><name>Overlay Track</name> <section anchor="overlay-track"><name>Overlay Track</name>
<!-- [rfced] The noun ("tracks") is plural, but the pronoun ("it's") is
singular. Which of the following options is the best way to fix this
agreement issue?
Original:
Overlay tracks SHOULD be rendered in the same channel as the track
it's linked to.
Perhaps (both plural):
Overlay tracks SHOULD be rendered in the same channel as the track
they are linked to.
Or (both singular):
An overlay track SHOULD be rendered in the same channel as the track
it's linked to.
-->
<t>Overlay tracks <bcp14>SHOULD</bcp14> be rendered in the same channel as the t rack it's linked to. <t>Overlay tracks <bcp14>SHOULD</bcp14> be rendered in the same channel as the t rack it's linked to.
When content is found in such a track, it <bcp14>SHOULD</bcp14> be played on the rendering channel When content is found in such a track, it <bcp14>SHOULD</bcp14> be played on the rendering channel
instead of the original track.</t> instead of the original track.</t>
</section> </section>
<section anchor="multi-planar-and-3d-videos"><name>Multi-planar and 3D videos</n ame> <section anchor="multi-planar-and-3d-videos"><name>Multi-planar and 3D Videos</n ame>
<t>There are two different ways to compress 3D videos: have each eye track in a separate track <t>There are two different ways to compress 3D videos: have each eye track in a separate track
and have one track have both eyes combined inside (which is more efficient, comp ression-wise). and have one track have both eyes combined inside (which is more efficient compr ession-wise).
Matroska supports both ways.</t> Matroska supports both ways.</t>
<t>For the single track variant, there is the <tt>StereoMode Element</tt>, which defines how planes are <t>For the single-track variant, there is the <tt>StereoMode Element</tt>, which defines how planes are
assembled in the track (mono or left-right combined). Odd values of StereoMode m eans the left assembled in the track (mono or left-right combined). Odd values of StereoMode m eans the left
plane comes first for more convenient reading. The pixel count of the track (<tt >PixelWidth</tt>/<tt>PixelHeight</tt>) plane comes first for more convenient reading. The pixel count of the track (<tt >PixelWidth</tt>/<tt>PixelHeight</tt>)
is the raw amount of pixels, for example 3840x1080 for full HD side by side, and is the raw number of pixels (for example, 3840x1080 for full HD side by side), a
the <tt>DisplayWidth</tt>/<tt>DisplayHeight</tt> nd the <tt>DisplayWidth</tt>/<tt>DisplayHeight</tt>
in pixels is the amount of pixels for one plane (1920x1080 for that full HD stre in pixels is the number of pixels for one plane (1920x1080 for that full HD stre
am). am).
<!-- [rfced] Would it be helpful to update "Old stereo 3D" to "Old stereo 3D
movies" or something similar?
Original:
Old stereo 3D were displayed using anaglyph (cyan and red colors separated).
Perhaps:
Old stereo 3D movies were displayed using anaglyph (cyan and red colors separate
d).
-->
Old stereo 3D were displayed using anaglyph (cyan and red colors separated). Old stereo 3D were displayed using anaglyph (cyan and red colors separated).
For compatibility with such movies, there is a value of the StereoMode that corr esponds to AnaGlyph.</t> For compatibility with such movies, there is a value of the StereoMode that corr esponds to AnaGlyph.</t>
<t>There is also a &quot;packed&quot; mode (values 13 and 14) which consists of <t>There is also a "packed" mode (values 13 and 14) that consists of packing two
packing two frames together frames together
in a <tt>Block</tt> using lacing. The first frame is the left eye and the other in a <tt>Block</tt> that uses lacing. The first frame is the left eye and the ot
frame is the right eye her frame is the right eye
(or vice versa). The frames <bcp14>SHOULD</bcp14> be decoded in that order and a re possibly dependent (or vice versa). The frames <bcp14>SHOULD</bcp14> be decoded in that order and a re possibly dependent
on each other (P and B frames).</t> on each other (P and B frames).</t>
<t>For separate tracks, Matroska needs to define exactly which track does what. <t>For separate tracks, Matroska needs to define exactly which track does what.
<tt>TrackOperation</tt> with <tt>TrackCombinePlanes</tt> do that. For more detai ls look at <tt>TrackOperation</tt> with <tt>TrackCombinePlanes</tt> does that. For more det ails, see
<xref target="track-operation"></xref> on how TrackOperation works.</t> <xref target="track-operation"></xref> on how TrackOperation works.</t>
<t>The 3D support is still in infancy and may evolve to support more features.</ t> <t>The 3D support is still in infancy and may evolve to support more features.</ t>
<t>The StereoMode used to be part of Matroska v2 but it didn't meet the requirem ent <t>The StereoMode used to be part of Matroska v2, but it didn't meet the require ment
for multiple tracks. There was also a bug in libmatroska prior to 0.9.0 that wou ld save/read for multiple tracks. There was also a bug in libmatroska prior to 0.9.0 that wou ld save/read
it as <tt>0x53B9</tt> instead of <tt>0x53B8</tt>; see OldStereoMode (<xref targe t="oldstereomode-element"></xref>). <tt>Matroska Readers</tt> <bcp14>MAY</bcp14> support these legacy files by checking it as <tt>0x53B9</tt> instead of <tt>0x53B8</tt>; see OldStereoMode (<xref targe t="oldstereomode-element"></xref>). <tt>Matroska Readers</tt> <bcp14>MAY</bcp14> support these legacy files by checking
Matroska v2 or <tt>0x53B9</tt>. Matroska v2 or <tt>0x53B9</tt>.
The older values of StereoMode were 0: mono, 1: right eye, 2: left eye, 3: both eyes, the only values that can be found in OldStereoMode. The older values of StereoMode were 0 (mono), 1 (right eye), 2 (left eye), and 3 (both eyes); these are the only values that can be found in OldStereoMode.
They are not compatible with the StereoMode values found in Matroska v3 and abov e.</t> They are not compatible with the StereoMode values found in Matroska v3 and abov e.</t>
</section> </section>
</section> </section>
<section anchor="default-track-selection"><name>Default track selection</name> <section anchor="default-track-selection"><name>Default Track Selection</name>
<t>This section provides some example sets of Tracks and hypothetical user setti ngs, along with <t>This section provides some example sets of Tracks and hypothetical user setti ngs, along with
indications of which ones a similarly-configured <tt>Matroska Player</tt> <bcp14 >SHOULD</bcp14> automatically indications of which ones a similarly configured <tt>Matroska Player</tt> <bcp14 >SHOULD</bcp14> automatically
select for playback by default in such a situation. A player <bcp14>MAY</bcp14> provide additional settings select for playback by default in such a situation. A player <bcp14>MAY</bcp14> provide additional settings
with more detailed controls for more nuanced scenarios. These examples are provi ded as guidelines with more detailed controls for more nuanced scenarios. These examples are provi ded as guidelines
to illustrate the intended usages of the various supported Track flags, and thei r expected behaviors.</t> to illustrate the intended usages of the various supported Track flags and their expected behaviors.</t>
<t>Track names are shown in English for illustrative purposes; actual files may have titles <t>Track names are shown in English for illustrative purposes; actual files may have titles
in the language of each track, or provide titles in multiple languages.</t> in the language of each track or provide titles in multiple languages.</t>
<section anchor="audio-selection"><name>Audio Selection</name> <section anchor="audio-selection"><name>Audio Selection</name>
<t>Example track set:</t> <t>Example track set:</t>
<table anchor="audioTrackSelection"><name>Audio Tracks for default selection</na me> <table anchor="audioTrackSelection"><name>Audio Tracks for Default Selection</na me>
<thead> <thead>
<tr> <tr>
<th>No.</th> <th>No.</th>
<th>Type</th> <th>Type</th>
<th>Lang</th> <th>Lang</th>
<th>Layout</th> <th>Layout</th>
<th>Original</th> <th>Original</th>
<th>Default</th> <th>Default</th>
<th>Other flags</th> <th>Other Flags</th>
<th>Name</th> <th>Name</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td>1</td> <td>1</td>
<td>Video</td> <td>Video</td>
<td>und</td> <td>und</td>
<td>N/A</td> <td>N/A</td>
skipping to change at line 6548 skipping to change at line 7240
<td></td> <td></td>
</tr> </tr>
<tr> <tr>
<td>4</td> <td>4</td>
<td>Audio</td> <td>Audio</td>
<td>eng</td> <td>eng</td>
<td>2.0</td> <td>2.0</td>
<td>1</td> <td>1</td>
<td>0</td> <td>0</td>
<td>Visual-impaired</td> <td>Visual-Impaired</td>
<td>Descriptive audio</td> <td>Descriptive audio</td>
</tr> </tr>
<tr> <tr>
<td>5</td> <td>5</td>
<td>Audio</td> <td>Audio</td>
<td>esp</td> <td>esp</td>
<td>5.1</td> <td>5.1</td>
<td>0</td> <td>0</td>
<td>1</td> <td>1</td>
skipping to change at line 6570 skipping to change at line 7262
<td></td> <td></td>
</tr> </tr>
<tr> <tr>
<td>6</td> <td>6</td>
<td>Audio</td> <td>Audio</td>
<td>esp</td> <td>esp</td>
<td>2.0</td> <td>2.0</td>
<td>0</td> <td>0</td>
<td>0</td> <td>0</td>
<td>Visual-impaired</td> <td>Visual-Impaired</td>
<td>Descriptive audio</td> <td>Descriptive audio</td>
</tr> </tr>
<tr> <tr>
<td>7</td> <td>7</td>
<td>Audio</td> <td>Audio</td>
<td>eng</td> <td>eng</td>
<td>2.0</td> <td>2.0</td>
<td>1</td> <td>1</td>
<td>0</td> <td>0</td>
skipping to change at line 6596 skipping to change at line 7288
<td>8</td> <td>8</td>
<td>Audio</td> <td>Audio</td>
<td>eng</td> <td>eng</td>
<td>2.0</td> <td>2.0</td>
<td>1</td> <td>1</td>
<td>0</td> <td>0</td>
<td>None</td> <td>None</td>
<td>Karaoke</td> <td>Karaoke</td>
</tr> </tr>
</tbody> </tbody>
</table><t>Here we have a file with 7 audio tracks, of which 5 are in English an d 2 are in Spanish.</t> </table><t>The table above shows a file with seven audio tracks -- five in Engli sh and two in Spanish.</t>
<t>The English tracks all have the Original flag, indicating that English is the original content language.</t> <t>The English tracks all have the Original flag, indicating that English is the original content language.</t>
<t>Generally the player will first consider the track languages: if the player h <t>Generally, the player will first consider the track languages. If the player
as an option to prefer has an option to prefer
original-language audio and the user has enabled it, then it should prefer one o original-language audio and the user has enabled it, then it should prefer one o
f the Original-flagged tracks. f the tracks with the Original flag.
<!-- [rfced] Please review "If configured to specifically prefer" here. What
is configured?
Original:
If configured to specifically prefer audio tracks in English or
Spanish, the player should select one of the tracks in the corresponding
language.
Perhaps:
If the user has configured to specifically prefer audio
tracks in English or Spanish, the player should select one of the tracks in
the corresponding language.
-->
If configured to specifically prefer audio tracks in English or Spanish, the pla yer should select one of If configured to specifically prefer audio tracks in English or Spanish, the pla yer should select one of
the tracks in the corresponding language. The player may also wish to prefer an the tracks in the corresponding language. The player may also wish to prefer a t
Original-flagged track rack with the Original flag
if no tracks matching any of the user's explicitly-preferred languages are avail if no tracks matching any of the user's explicitly preferred languages are avail
able.</t> able.</t>
<t>Two of the tracks have the Visual-impaired flag. If the player has been confi <t>Two of the tracks have the Visual-Impaired flag. If the player has been confi
gured to prefer such tracks, gured to prefer such tracks,
it should select one; otherwise, it should avoid them if possible.</t> it should select one; otherwise, it should avoid them if possible.</t>
<t>If selecting an English track, when other settings have left multiple possibl e options, <t>If selecting an English track, when other settings have left multiple possibl e options,
it may be useful to exclude the tracks that lack the Default flag: here, one pro it may be useful to exclude the tracks that lack the Default flag. Here, one pro
vides descriptive service for vides descriptive service for
the visually impaired (which has its own flag and may be automatically selected individuals with visual impairments (which has its own flag and may be automatic
by user configuration, ally selected by user configuration
but is unsuitable for users with default-configured players), one is a commentar y track but is unsuitable for users with default-configured players), one is a commentar y track
(which has its own flag, which the player may or may not have specialized handli (which has its own flag and the player may or may not have specialized handling
ng for), for),
and the last contains karaoke versions of the music that plays during the film, and the last contains karaoke versions of the music that plays during the film (
which is an unusual which is an unusual
specialized audio service that Matroska has no built-in support for indicating, so it's indicated specialized audio service that Matroska has no built-in support for indicating, so it's indicated
in the track name instead. By not setting the Default flag on these specialized tracks, the file's author in the track name instead). By not setting the Default flag on these specialized tracks, the file's author
hints that they should not be automatically selected by a default-configured pla yer.</t> hints that they should not be automatically selected by a default-configured pla yer.</t>
<t>Having narrowed its choices down, our example player now may have to select b etween tracks 2 and 3. <t>Having narrowed its choices down, the example player now may have to select b etween tracks 2 and 3.
The only difference between these tracks is their channel layouts: 2 is 5.1 surr ound, while 3 is stereo. The only difference between these tracks is their channel layouts: 2 is 5.1 surr ound, while 3 is stereo.
If the player is aware that the output device is a pair of headphones or stereo speakers, it may wish If the player is aware that the output device is a pair of headphones or stereo speakers, it may wish
to prefer the stereo mix automatically. On the other hand, if it knows that the device is a surround system, to prefer the stereo mix automatically. On the other hand, if it knows that the device is a surround system,
it may wish to prefer the surround mix.</t> it may wish to prefer the surround mix.</t>
<t>If the player finishes analyzing all of the available audio tracks and finds that multiple seems equally <t>If the player finishes analyzing all of the available audio tracks and finds that more than one seem equally
and maximally preferable, it <bcp14>SHOULD</bcp14> default to the first of the g roup.</t> and maximally preferable, it <bcp14>SHOULD</bcp14> default to the first of the g roup.</t>
</section> </section>
<section anchor="subtitle-selection"><name>Subtitle selection</name> <section anchor="subtitle-selection"><name>Subtitle Selection</name>
<t>Example track set:</t> <t>Example track set:</t>
<table anchor="subtitleTrackSelection"><name>Subtitle Tracks for default selecti on</name> <table anchor="subtitleTrackSelection"><name>Subtitle Tracks for Default Selecti on</name>
<thead> <thead>
<tr> <tr>
<th>No.</th> <th>No.</th>
<th>Type</th> <th>Type</th>
<th>Lang</th> <th>Lang</th>
<th>Original</th> <th>Original</th>
<th>Default</th> <th>Default</th>
<th>Forced</th> <th>Forced</th>
<th>Other flags</th> <th>Other flags</th>
<th>Name</th> <th>Name</th>
skipping to change at line 6691 skipping to change at line 7396
<td></td> <td></td>
</tr> </tr>
<tr> <tr>
<td>5</td> <td>5</td>
<td>Subtitles</td> <td>Subtitles</td>
<td>fra</td> <td>fra</td>
<td>1</td> <td>1</td>
<td>0</td> <td>0</td>
<td>0</td> <td>0</td>
<td>Hearing-impaired</td> <td>Hearing-Impaired</td>
<td>Captions for the hearing-impaired</td> <td>Captions for users with hearing impairments</td>
</tr> </tr>
<tr> <tr>
<td>6</td> <td>6</td>
<td>Subtitles</td> <td>Subtitles</td>
<td>por</td> <td>por</td>
<td>0</td> <td>0</td>
<td>1</td> <td>1</td>
<td>0</td> <td>0</td>
<td>None</td> <td>None</td>
skipping to change at line 6724 skipping to change at line 7429
<td>Signs</td> <td>Signs</td>
</tr> </tr>
<tr> <tr>
<td>8</td> <td>8</td>
<td>Subtitles</td> <td>Subtitles</td>
<td>por</td> <td>por</td>
<td>0</td> <td>0</td>
<td>0</td> <td>0</td>
<td>0</td> <td>0</td>
<td>Hearing-impaired</td> <td>Hearing-Impaired</td>
<td>SDH</td> <td>SDH</td>
</tr> </tr>
</tbody> </tbody>
</table><t>Here we have 2 audio tracks and 5 subtitle tracks. As we can see, Fre </table><t>The table above shows two audio tracks and five subtitle tracks. As w
nch is the original language.</t> e can see, French is the original language.</t>
<t>We'll start by discussing the case where the user prefers French (or Original <t>We'll start by discussing the case where the user prefers French (or original
-language) -language)
audio (or has explicitly selected the French audio track), and also prefers Fren audio (or has explicitly selected the French audio track) and also prefers Frenc
ch subtitles.</t> h subtitles.</t>
<t>In this case, if the player isn't configured to display captions when the aud io matches their <t>In this case, if the player isn't configured to display captions when the aud io matches their
preferred subtitle languages, the player doesn't need to select a subtitle track at all.</t> preferred subtitle languages, the player doesn't need to select a subtitle track at all.</t>
<t>If the user <em>has</em> indicated that they want captions to be displayed, t he selection simply <t>If the user <em>has</em> indicated that they want captions to be displayed, t he selection simply
comes down to whether Hearing-impaired subtitles are preferred.</t> comes down to whether hearing-impaired subtitles are preferred.</t>
<t>The situation for a user who prefers Portuguese subtitles starts out somewhat analogous. <t>The situation for a user who prefers Portuguese subtitles starts out somewhat analogous.
If they select the original French audio (either by explicit audio language pref erence, If they select the original French audio (either by explicit audio language pref erence,
preference for Original-language tracks, or by explicitly selecting that track), then the preference for original-language tracks, or explicitly selecting that track), th en the
selection once again comes down to the hearing-impaired preference.</t> selection once again comes down to the hearing-impaired preference.</t>
<t>However, the case where the Portuguese audio track is selected has an importa nt catch: <t>However, the case where the Portuguese audio track is selected has an importa nt catch:
a Forced track in Portuguese is present. This may contain translations of onscre a Forced track in Portuguese is present. This may contain translations of on-scr
en text een text
from the video track, or of portions of the audio that are not translated (music from the video track or of portions of the audio that are not translated (music,
, for instance). for instance).
This means that even if the user's preferences wouldn't normally call for captio ns here, This means that even if the user's preferences wouldn't normally call for captio ns here,
the Forced track should be selected nonetheless, rather than selecting no track at all. the Forced track should be selected nonetheless, rather than selecting no track at all.
On the other hand, if the user's preferences <em>do</em> call for captions, the non-Forced tracks On the other hand, if the user's preferences <em>do</em> call for captions, the non-Forced tracks
should be preferred, as the Forced track will not contain captioning for the dia logue.</t> should be preferred, as the Forced track will not contain captioning for the dia logue.</t>
</section> </section>
</section> </section>
<section anchor="chapters"><name>Chapters</name> <section anchor="chapters"><name>Chapters</name>
<t>The Matroska Chapters system can have multiple <tt>Editions</tt> and each <tt <t>The Matroska Chapters system can have multiple <tt>Editions</tt>, and each <t
>Edition</tt> can consist of t>Edition</tt> can consist of
<tt>Simple Chapters</tt> where a chapter start time is used as marker in the tim <tt>Simple Chapters</tt> where a chapter start time is used as a marker in the t
eline only. An imeline only. An
<tt>Edition</tt> can be more complex with <tt>Ordered Chapters</tt> where a chap <tt>Edition</tt> can be more complex with <tt>Ordered Chapters</tt> where a chap
ter end time stamp is additionally ter end timestamp is additionally
used or much more complex with <tt>Linked Chapters</tt>. The Matroska Chapters s ystem can also have a menu used or much more complex with <tt>Linked Chapters</tt>. The Matroska Chapters s ystem can also have a menu
structure, borrowed from the DVD menu system <xref target="DVD-Video"></xref>, o r have its own built-in Matroska menu structure.</t> structure borrowed from the DVD-menu system <xref target="DVD-Video"></xref> or have its own built-in Matroska menu structure.</t>
<section anchor="editionentry"><name>EditionEntry</name> <section anchor="editionentry"><name>EditionEntry</name>
<t>The <tt>EditionEntry</tt> is also called an <tt>Edition</tt>. <t>The <tt>EditionEntry</tt> is also called an <tt>Edition</tt>.
An <tt>Edition</tt> contains a set of <tt>Edition</tt> flags and <bcp14>MUST</bc p14> contain at least one <tt>ChapterAtom Element</tt>. An <tt>Edition</tt> contains a set of <tt>Edition</tt> flags and <bcp14>MUST</bc p14> contain at least one <tt>ChapterAtom Element</tt>.
Chapters are always inside an <tt>Edition</tt> (or a Chapter itself part of an < tt>Edition</tt>). Chapters are always inside an <tt>Edition</tt> (or a Chapter itself is part of a n <tt>Edition</tt>).
Multiple Editions are allowed. Some of these Editions <bcp14>MAY</bcp14> be orde red and others not.</t> Multiple Editions are allowed. Some of these Editions <bcp14>MAY</bcp14> be orde red and others not.</t>
<section anchor="editionflagdefault"><name>EditionFlagDefault</name> <section anchor="editionflagdefault"><name>EditionFlagDefault</name>
<t>Only one <tt>Edition</tt> <bcp14>SHOULD</bcp14> have an <tt>EditionFlagDefaul t</tt> flag set to <tt>true</tt>.</t> <t>Only one <tt>Edition</tt> <bcp14>SHOULD</bcp14> have an <tt>EditionFlagDefaul t</tt> flag set to <tt>true</tt>.</t>
</section> </section>
<section anchor="default-edition"><name>Default Edition</name> <section anchor="default-edition"><name>Default Edition</name>
<t>The <tt>Default Edition</tt> is the <tt>Edition</tt> that a <tt>Matroska Play er</tt> <bcp14>SHOULD</bcp14> use for playback by default.</t> <t>The <tt>Default Edition</tt> is the <tt>Edition</tt> that a <tt>Matroska Play er</tt> <bcp14>SHOULD</bcp14> use for playback by default.</t>
<t>The first <tt>Edition</tt> with the <tt>EditionFlagDefault</tt> flag set to < tt>true</tt> is the <tt>Default Edition</tt>.</t> <t>The first <tt>Edition</tt> with the <tt>EditionFlagDefault</tt> flag set to < tt>true</tt> is the <tt>Default Edition</tt>.</t>
<t>When all <tt>EditionFlagDefault</tt> flags are set to <tt>false</tt>, then th e first <tt>Edition</tt> <t>When all <tt>EditionFlagDefault</tt> flags are set to <tt>false</tt>, then th e first <tt>Edition</tt>
is the <tt>Default Edition</tt>.</t> is the <tt>Default Edition</tt>.</t>
<table anchor="defaultEditionAllDefault"><name>Default edition, all default</nam e> <table anchor="defaultEditionAllDefault"><name>Default Edition, All Default</nam e>
<thead> <thead>
<tr> <tr>
<th align="left">Edition</th> <th align="left">Edition</th>
<th align="left">FlagDefault</th> <th align="left">FlagDefault</th>
<th align="left">Default Edition</th> <th align="left">Default Edition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 6799 skipping to change at line 7504
<td align="left">true</td> <td align="left">true</td>
<td align="left"></td> <td align="left"></td>
</tr> </tr>
<tr> <tr>
<td align="left">Edition 3</td> <td align="left">Edition 3</td>
<td align="left">true</td> <td align="left">true</td>
<td align="left"></td> <td align="left"></td>
</tr> </tr>
</tbody> </tbody>
</table><table anchor="defaultEditionNoDefault"><name>Default edition, no defaul t</name> </table><table anchor="defaultEditionNoDefault"><name>Default Edition, No Defaul t</name>
<thead> <thead>
<tr> <tr>
<th align="left">Edition</th> <th align="left">Edition</th>
<th align="left">FlagDefault</th> <th align="left">FlagDefault</th>
<th align="left">Default Edition</th> <th align="left">Default Edition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 6827 skipping to change at line 7532
<td align="left">false</td> <td align="left">false</td>
<td align="left"></td> <td align="left"></td>
</tr> </tr>
<tr> <tr>
<td align="left">Edition 3</td> <td align="left">Edition 3</td>
<td align="left">false</td> <td align="left">false</td>
<td align="left"></td> <td align="left"></td>
</tr> </tr>
</tbody> </tbody>
</table><table anchor="defaultEditionWithDefault"><name>Default edition, with de fault</name> </table><table anchor="defaultEditionWithDefault"><name>Default Edition, With De fault</name>
<thead> <thead>
<tr> <tr>
<th align="left">Edition</th> <th align="left">Edition</th>
<th align="left">FlagDefault</th> <th align="left">FlagDefault</th>
<th align="left">Default Edition</th> <th align="left">Default Edition</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 6858 skipping to change at line 7563
<tr> <tr>
<td align="left">Edition 3</td> <td align="left">Edition 3</td>
<td align="left">false</td> <td align="left">false</td>
<td align="left"></td> <td align="left"></td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table></section>
<section anchor="editionflagordered"><name>EditionFlagOrdered</name> <section anchor="editionflagordered"><name>EditionFlagOrdered</name>
<t>The <tt>EditionFlagOrdered Flag</tt> is a significant feature as it enables a <t>The <tt>EditionFlagOrdered</tt> flag is a significant feature, as it enables
n <tt>Edition</tt> an <tt>Edition</tt>
of <tt>Ordered Chapters</tt> which defines and arranges a virtual timeline rathe of <tt>Ordered Chapters</tt> that defines and arranges a virtual timeline rather
r than simply than simply
labeling points within the timeline. For example, with <tt>Editions</tt> of <tt> labeling points within the timeline. For example, with <tt>Editions</tt> of <tt>
Ordered Chapters</tt> Ordered Chapters</tt>,
a single <tt>Matroska file</tt> can present multiple edits of a film without dup licating content. a single <tt>Matroska file</tt> can present multiple edits of a film without dup licating content.
Alternatively, if a videotape is digitized in full, one <tt>Ordered Edition</tt> could present Alternatively, if a videotape is digitized in full, one <tt>Ordered Edition</tt> could present
the full content (including colorbars, countdown, slate, a feature presentation, and the full content (including colorbars, countdown, slate, a feature presentation, and
black frames), while another <tt>Edition</tt> of <tt>Ordered Chapters</tt> can u se <tt>Chapters</tt> that only black frames), while another <tt>Edition</tt> of <tt>Ordered Chapters</tt> can u se <tt>Chapters</tt> that only
mark the intended presentation with the colorbars and other ancillary visual inf ormation mark the intended presentation with the colorbars and other ancillary visual inf ormation
excluded. If an <tt>Edition</tt> of <tt>Ordered Chapters</tt> is enabled, then t he <tt>Matroska Player</tt> <bcp14>MUST</bcp14> excluded. If an <tt>Edition</tt> of <tt>Ordered Chapters</tt> is enabled, then t he <tt>Matroska Player</tt> <bcp14>MUST</bcp14>
play those Chapters in their stored order from the timestamp marked in the play those Chapters in their stored order from the timestamp marked in the
<tt>ChapterTimeStart Element</tt> to the timestamp marked in to <tt>ChapterTimeE nd Element</tt>.</t> <tt>ChapterTimeStart Element</tt> to the timestamp marked in to <tt>ChapterTimeE nd Element</tt>.</t>
<t>If the <tt>EditionFlagOrdered Flag</tt> evaluates to &quot;0&quot;, <tt>Simpl <t>If the <tt>EditionFlagOrdered</tt> flag evaluates to "0", <tt>Simple Chapters
e Chapters</tt> are used and </tt> are used and
only the <tt>ChapterTimeStart</tt> of a <tt>Chapter</tt> is used as chapter mark only the <tt>ChapterTimeStart</tt> of a <tt>Chapter</tt> is used as a chapter ma
to jump to the rk to jump to the
predefined point in the timeline. With <tt>Simple Chapters</tt>, a <tt>Matroska Player</tt> <bcp14>MUST</bcp14> predefined point in the timeline. With <tt>Simple Chapters</tt>, a <tt>Matroska Player</tt> <bcp14>MUST</bcp14>
ignore certain <tt>Chapter Elements</tt>. In that case these elements are inform ational only.</t> ignore certain <tt>Chapter Elements</tt>. In that case, these elements are infor mational only.</t>
<t>The following list shows the different Chapter elements only found in <tt>Ord ered Chapters</tt>.</t> <t>The following list shows the different Chapter elements only found in <tt>Ord ered Chapters</tt>.</t>
<table anchor="orderedOnly"><name>elements only found in ordered chapters</name>
<thead>
<tr>
<th align="left">Ordered Chapter elements</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">ChapterAtom/ChapterSegmentUUID</td>
</tr>
<tr>
<td align="left">ChapterAtom/ChapterSegmentEditionUID</td>
</tr>
<tr>
<td align="left">ChapterAtom/ChapterTrack</td>
</tr>
<tr>
<td align="left">ChapterAtom/ChapProcess</td>
</tr>
<tr>
<td align="left">Info/ChapterTranslate</td>
</tr>
<tr>
<td align="left">TrackEntry/TrackTranslate</td>
</tr>
</tbody>
</table><t>Furthermore, there are other EBML <tt>Elements</tt> which could be us
ed if the <tt>EditionFlagOrdered</tt>
evaluates to &quot;1&quot;.</t>
<section anchor="ordered-edition-and-matroska-segment-linking"><name>Ordered-Edi
tion and Matroska Segment-Linking</name>
<ul> <ul>
<li><t>Hard Linking: <tt>Ordered-Chapters</tt> supersedes the <tt>Hard Linking</ <li>ChapterAtom/ChapterSegmentUUID</li>
tt>.</t> <li>ChapterAtom/ChapterSegmentEditionUID</li>
</li> <li>ChapterAtom/ChapterTrack</li>
<li><t>Medium Linking: <tt>Ordered Chapters</tt> are used in a normal way and ca <li>ChapterAtom/ChapProcess</li>
n be combined <li>Info/ChapterTranslate</li>
with the <tt>ChapterSegmentUUID</tt> element which establishes a link to another <li>TrackEntry/TrackTranslate</li>
Segment.</t>
</li>
</ul> </ul>
<t>See <xref target="linked-segments"></xref> on the Linked Segments for more in <t>Furthermore, there are other EBML <tt>Elements</tt> that could be used if the
formation <tt>EditionFlagOrdered</tt>
evaluates to "1".</t>
<section anchor="ordered-edition-and-matroska-segment-linking"><name>Ordered-Edi
tion and Matroska Segment Linking</name>
<dl>
<dt>Hard Linking:</dt><dd><tt>Ordered Chapters</tt> supersede the <tt>Hard Linki
ng</tt>.</dd>
<dt>Medium Linking:</dt><dd><tt>Ordered Chapters</tt> are used in a normal way a
nd can be combined
with the <tt>ChapterSegmentUUID</tt> element, which establishes a link to anothe
r Segment.</dd>
</dl>
<t>See <xref target="linked-segments"></xref> on Linked Segments for more inform
ation
about <tt>Hard Linking</tt> and <tt>Medium Linking</tt>.</t> about <tt>Hard Linking</tt> and <tt>Medium Linking</tt>.</t>
</section> </section>
</section> </section>
</section> </section>
<section anchor="chapteratom"><name>ChapterAtom</name> <section anchor="chapteratom"><name>ChapterAtom</name>
<t>The <tt>ChapterAtom</tt> is also called a <tt>Chapter</tt>.</t> <t>The <tt>ChapterAtom</tt> is also called a <tt>Chapter</tt>.</t>
<section anchor="chaptertimestart"><name>ChapterTimeStart</name> <section anchor="chaptertimestart"><name>ChapterTimeStart</name>
<t>The timestamp of the start of <tt>Chapter</tt> with nanosecond accuracy, not <t><tt>ChapterTimeStart</tt> is the timestamp of the start of <tt>Chapter</tt> w
scaled by TimestampScale. ith nanosecond accuracy and is not scaled by TimestampScale.
For <tt>Simple Chapters</tt> this is the position of the chapter markers in the For <tt>Simple Chapters</tt>, this is the position of the chapter markers in the
timeline.</t> timeline.</t>
</section> </section>
<section anchor="chaptertimeend"><name>ChapterTimeEnd</name> <section anchor="chaptertimeend"><name>ChapterTimeEnd</name>
<t>The timestamp of the end of <tt>Chapter</tt> with nanosecond accuracy, not sc aled by TimestampScale. <t><tt>ChapterTimeEnd</tt> is the timestamp of the end of <tt>Chapter</tt> with nanosecond accuracy and is not scaled by TimestampScale.
The timestamp defined by the <tt>ChapterTimeEnd</tt> is not part of the <tt>Chap ter</tt>. The timestamp defined by the <tt>ChapterTimeEnd</tt> is not part of the <tt>Chap ter</tt>.
A <tt>Matroska Player</tt> calculates the duration of this <tt>Chapter</tt> usin g the difference between the A <tt>Matroska Player</tt> calculates the duration of this <tt>Chapter</tt> usin g the difference between the
<tt>ChapterTimeEnd</tt> and <tt>ChapterTimeStart</tt>. <tt>ChapterTimeEnd</tt> and <tt>ChapterTimeStart</tt>.
The end timestamp <bcp14>MUST</bcp14> be greater than or equal to the start time stamp.</t> The end timestamp <bcp14>MUST</bcp14> be greater than or equal to the start time stamp.</t>
<t>When the <tt>ChapterTimeEnd</tt> timestamp is equal to the <tt>ChapterTimeSta rt</tt> timestamp, <t>When the <tt>ChapterTimeEnd</tt> timestamp is equal to the <tt>ChapterTimeSta rt</tt> timestamp,
the timestamps is included in the <tt>Chapter</tt>. It can be useful to put mark ers in the timestamp is included in the <tt>Chapter</tt>. It can be useful to put marke rs in
a file or add chapter commands with ordered chapter commands without having to p lay anything; a file or add chapter commands with ordered chapter commands without having to p lay anything;
see <xref target="chapprocess-element"></xref>.</t> see <xref target="chapprocess-element"></xref>.</t>
<table anchor="ChapterTimeEndUsage"><name>ChapterTimeEnd usage possibilities</na <table anchor="ChapterTimeEndUsage"><name>ChapterTimeEnd Usage
me> Possibilities</name>
<thead> <thead>
<tr> <tr>
<th align="left">Chapter</th> <th align="left">Chapter</th>
<th align="left">Start timestamp</th> <th align="left">Start timestamp</th>
<th align="left">End timestamp</th> <th align="left">End timestamp</th>
<th align="left">Duration</th> <th align="left">Duration</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
skipping to change at line 6985 skipping to change at line 7666
<td align="left">Chapter 4</td> <td align="left">Chapter 4</td>
<td align="left">9000000000</td> <td align="left">9000000000</td>
<td align="left">8000000000</td> <td align="left">8000000000</td>
<td align="left">Invalid (-1000000000)</td> <td align="left">Invalid (-1000000000)</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table></section>
<section anchor="nested-chapters"><name>Nested Chapters</name> <section anchor="nested-chapters"><name>Nested Chapters</name>
<t>A <tt>ChapterAtom</tt> element can contain other <tt>ChapterAtom</tt> element s. <t>A <tt>ChapterAtom</tt> element can contain other <tt>ChapterAtom</tt> element s.
That element is a <tt>Parent Chapter</tt> and the <tt>ChapterAtom</tt> elements it contains are <tt>Nested Chapters</tt>.</t> That element is a <tt>Parent Chapter</tt>, and the <tt>ChapterAtom</tt> elements it contains are <tt>Nested Chapters</tt>.</t>
<t>Nested Chapters can be useful to tag small parts of a Segment that already ha ve tags or <t>Nested Chapters can be useful to tag small parts of a Segment that already ha ve tags or
add Chapter Codec commands on smaller parts of a Segment that already have Chapt er Codec commands.</t> add Chapter Codec commands on smaller parts of a Segment that already have Chapt er Codec commands.</t>
<t>The <tt>ChapterTimeStart</tt> of a <tt>Nested Chapter</tt> <bcp14>MUST</bcp14 > be greater than or equal to the <tt>ChapterTimeStart</tt> its <tt>Parent Chapt er</tt>.</t> <t>The <tt>ChapterTimeStart</tt> of a <tt>Nested Chapter</tt> <bcp14>MUST</bcp14 > be greater than or equal to the <tt>ChapterTimeStart</tt> of its <tt>Parent Ch apter</tt>.</t>
<t>If the <tt>Parent Chapter</tt> of a <tt>Nested Chapter</tt> has a <tt>Chapter TimeEnd</tt>, the <tt>ChapterTimeStart</tt> of that <tt>Nested Chapter</tt> <t>If the <tt>Parent Chapter</tt> of a <tt>Nested Chapter</tt> has a <tt>Chapter TimeEnd</tt>, the <tt>ChapterTimeStart</tt> of that <tt>Nested Chapter</tt>
<bcp14>MUST</bcp14> be smaller than or equal to the <tt>ChapterTimeEnd</tt> of t he <tt>Parent Chapter</tt>.</t> <bcp14>MUST</bcp14> be smaller than or equal to the <tt>ChapterTimeEnd</tt> of t he <tt>Parent Chapter</tt>.</t>
</section> </section>
<section anchor="nested-chapters-in-ordered-chapters"><name>Nested Chapters in O rdered Chapters</name> <section anchor="nested-chapters-in-ordered-chapters"><name>Nested Chapters in O rdered Chapters</name>
<t>The <tt>ChapterTimeEnd</tt> of the lowest level of <tt>Nested Chapters</tt> < bcp14>MUST</bcp14> be set for Ordered Chapters.</t> <t>The <tt>ChapterTimeEnd</tt> of the lowest level of <tt>Nested Chapters</tt> < bcp14>MUST</bcp14> be set for Ordered Chapters.</t>
<t>When used with Ordered Chapters, the <tt>ChapterTimeEnd</tt> value of a <tt>P arent Chapter</tt> is useless for playback <t>When used with Ordered Chapters, the <tt>ChapterTimeEnd</tt> value of a <tt>P arent Chapter</tt> is useless for playback,
as the proper playback sections are described in its <tt>Nested Chapters</tt>. as the proper playback sections are described in its <tt>Nested Chapters</tt>.
The <tt>ChapterTimeEnd</tt> <bcp14>SHOULD NOT</bcp14> be set in <tt>Parent Chapt ers</tt> and <bcp14>MUST</bcp14> be ignored for playback.</t> The <tt>ChapterTimeEnd</tt> <bcp14>SHOULD NOT</bcp14> be set in <tt>Parent Chapt ers</tt> and <bcp14>MUST</bcp14> be ignored for playback.</t>
</section> </section>
<section anchor="chapterflaghidden"><name>ChapterFlagHidden</name> <section anchor="chapterflaghidden"><name>ChapterFlagHidden</name>
<!-- [rfced] Please review "Chapter ChapterFlagHidden flag" and "Parent
Chapter ChapterFlagHidden flag". Will these be clear for readers? Would
updating to use a possessive be helpful?
Original:
Each Chapter ChapterFlagHidden flag works independently of parent
chapters. A Nested Chapter with a ChapterFlagHidden that evaluates
to "0" remains visible in the user interface even if the Parent
Chapter ChapterFlagHidden flag is set to "1".
Perhaps:
Each Chapter's ChapterFlagHidden flag works independently of Parent
Chapters. A Nested Chapter with a ChapterFlagHidden flag that evaluates to
"0" remains visible in the user interface even if the Parent Chapter's
ChapterFlagHidden flag is set to "1".
-->
<t>Each Chapter <t>Each Chapter
<tt>ChapterFlagHidden</tt> flag works independently of parent chapters. <tt>ChapterFlagHidden</tt> flag works independently of Parent Chapters.
A <tt>Nested Chapter</tt> with a <tt>ChapterFlagHidden</tt> that evaluates to &q A <tt>Nested Chapter</tt> with a <tt>ChapterFlagHidden</tt> flag that evaluates
uot;0&quot; remains visible in the user interface even if the to "0" remains visible in the user interface even if the
<tt>Parent Chapter</tt> <tt>ChapterFlagHidden</tt> flag is set to &quot;1&quot;. <tt>Parent Chapter</tt> <tt>ChapterFlagHidden</tt> flag is set to "1".</t>
</t> <table anchor="ChapterFlagHiddenNested"><name>ChapterFlagHidden Nested Visibilit
<table anchor="ChapterFlagHiddenNested"><name>ChapterFlagHidden nested visibilit y</name>
y</name>
<thead> <thead>
<tr> <tr>
<th align="left">Chapter + Nested Chapter</th> <th align="left">Chapter + Nested Chapter</th>
<th align="left">ChapterFlagHidden</th> <th align="left">ChapterFlagHidden</th>
<th align="left">visible</th> <th align="left">visible</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
skipping to change at line 7054 skipping to change at line 7751
<tr> <tr>
<td align="left">Nested Chapter 2.2</td> <td align="left">Nested Chapter 2.2</td>
<td align="left">1</td> <td align="left">1</td>
<td align="left">no</td> <td align="left">no</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table></section>
</section> </section>
<section anchor="menu-features"><name>Menu features</name> <section anchor="menu-features"><name>Menu Features</name>
<t>The menu features are handled like a <tt>chapter codec</tt>. That means each codec has a type, <t>The menu features are handled like a <tt>chapter codec</tt>. That means each codec has a type,
some private data and some data in the chapters.</t> some private data, and some data in the chapters.</t>
<t>The type of the menu system is defined by the <tt>ChapProcessCodecID</tt> par <t>The type of the menu system is defined by the <tt>ChapProcessCodecID</tt> par
ameter. For now, ameter.
only 2 values are supported : 0 matroska script, 1 menu borrowed from the DVD <x
ref target="DVD-Video"></xref>. <!-- [rfced] Will readers understand the use of "idem" here? Would it be
The private data depend on the type of menu system (stored in <tt>ChapProcessPri helpful to update as follows (or something similar)?
vate</tt>),
idem for the data in the chapters (stored in <tt>ChapProcessData</tt>).</t> Original:
<t>The menu system, as well as Chapter Codecs in general, can do actions on the The private data depend on
<tt>Matroska Player</tt> the type of menu system (stored in ChapProcessPrivate), idem for the
like jumping to another Chapter or Edition, selecting different tracks and possi data in the chapters (stored in ChapProcessData).
bly more.
The scope of all the possibilities of Chapter Codecs is not covered in this docu Perhaps:
ment as it The private data depend on
the type of menu system (stored in ChapProcessPrivate), which is the same for
the
data in the chapters (stored in ChapProcessData).
Or:
The private data depend on
the type of menu system (stored in ChapProcessPrivate); the same is true for
the
data in the chapters (stored in ChapProcessData).
-->
For now, only two values are supported: 0 (Matroska Script) and 1 (menu borrowed
from the DVD <xref target="DVD-Video"></xref>).
The private data depend on the type of menu system (stored in <tt>ChapProcessPri
vate</tt>), idem for the data in the chapters (stored in <tt>ChapProcessData</tt
>).</t>
<t>The menu system, as well as Chapter Codecs in general, can perform actions on
the <tt>Matroska Player</tt>, such as jumping to another Chapter or Edition, se
lecting different tracks, and possibly more.
The scope of all the possibilities of Chapter Codecs is not covered in this docu
ment, as it
depends on the Chapter Codec features and its integration in a <tt>Matroska Play er</tt>.</t> depends on the Chapter Codec features and its integration in a <tt>Matroska Play er</tt>.</t>
</section> </section>
<section anchor="physical-types"><name>Physical Types</name> <section anchor="physical-types"><name>Physical Types</name>
<t>Each level can have different meanings for audio and video. The <tt>ORIGINAL_ MEDIA_TYPE</tt> tag <xref target="MatroskaTags"></xref> can be used to <t>Each level can have different meanings for audio and video. The <tt>ORIGINAL_ MEDIA_TYPE</tt> tag <xref target="I-D.ietf-cellar-tags"></xref> can be used to
specify a string for ChapterPhysicalEquiv = 60. Here is the list of possible lev els for both audio and video:</t> specify a string for ChapterPhysicalEquiv = 60. Here is the list of possible lev els for both audio and video:</t>
<table anchor="ChapterPhysicalEquivMeaning"><name>ChapterPhysicalEquiv meaning p er track type</name> <table anchor="ChapterPhysicalEquivMeaning"><name>ChapterPhysicalEquiv Meaning p er Track Type</name>
<thead> <thead>
<tr> <tr>
<th align="left">Value</th> <th align="left">Value</th>
<th align="left">Audio</th> <th align="left">Audio</th>
<th align="left">Video</th> <th align="left">Video</th>
<th align="left">Comment</th> <th align="left">Comment</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="left">70</td> <td align="left">70</td>
<td align="left">SET / PACKAGE</td> <td align="left">SET / PACKAGE</td>
<td align="left">SET / PACKAGE</td> <td align="left">SET / PACKAGE</td>
<td align="left">the collection of different media</td> <td align="left">the collection of different media</td>
</tr> </tr>
<tr> <tr>
<td align="left">60</td> <td align="left">60</td>
<td align="left">CD / 12&quot; / 10&quot; / 7&quot; / TAPE / MINIDISC / DAT</td> <td align="left">CD / 12" / 10" / 7" / TAPE / MINIDISC / DAT</td>
<td align="left">DVD / VHS / LASERDISC</td> <td align="left">DVD / VHS / LASERDISC</td>
<td align="left">the physical medium like a CD or a DVD</td> <td align="left">the physical medium like a CD or a DVD</td>
</tr> </tr>
<tr> <tr>
<td align="left">50</td> <td align="left">50</td>
<td align="left">SIDE</td> <td align="left">SIDE</td>
<td align="left">SIDE</td> <td align="left">SIDE</td>
<td align="left">when the original medium (LP/DVD) has different sides</td> <td align="left">when the original medium (LP/DVD) has different sides</td>
</tr> </tr>
skipping to change at line 7134 skipping to change at line 7849
<td align="left">10</td> <td align="left">10</td>
<td align="left">INDEX</td> <td align="left">INDEX</td>
<td align="left">-</td> <td align="left">-</td>
<td align="left">the first logical level of the side/medium</td> <td align="left">the first logical level of the side/medium</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table></section>
<section anchor="chapter-examples"><name>Chapter Examples</name> <section anchor="chapter-examples"><name>Chapter Examples</name>
<section anchor="example-1-basic-chaptering"><name>Example 1 : basic chaptering< <section anchor="example-1-basic-chaptering"><name>Example 1: Basic Chaptering</
/name> name>
<t>In this example a movie is split in different chapters. It could also just be <t>In this example, a movie is split in different chapters. It could also just b
an e an
audio file (album) on which each track corresponds to a chapter.</t> audio file (album) in which each track corresponds to a chapter.</t>
<ul spacing="compact"> <ul spacing="compact">
<li>00000 ms - 05000 ms : Intro</li> <li>00000 ms - 05000 ms: Intro</li>
<li>05000 ms - 25000 ms : Before the crime</li> <li>05000 ms - 25000 ms: Before the crime</li>
<li>25000 ms - 27500 ms : The crime</li> <li>25000 ms - 27500 ms: The crime</li>
<li>27500 ms - 38000 ms : The killer arrested</li> <li>27500 ms - 38000 ms: The killer arrested</li>
<li>38000 ms - 43000 ms : Credits</li> <li>38000 ms - 43000 ms: Credits</li>
</ul> </ul>
<t>This would translate in the following matroska form, with the EBML tree shown
as XML :</t> <!-- [rfced] How may we clarify this sentence? Note that this sentence appears
<figure><name>Basic Chapters Example. twice in the document.
Original:
This would translate in the following matroska form, with the EBML
tree shown as XML :
Perhaps:
This translates to Matroska form, with the EBML tree shown as follows in XML:
-->
<!-- [rfced] We see "The killer arrested" in the bulleted list below but not
in the XML following this list. The XML has "After the crime" (in both
English and French). Please review and let us know if any updates are
needed.
Current:
* 00000 ms - 05000 ms: Intro
* 05000 ms - 25000 ms: Before the crime
* 25000 ms - 27500 ms: The crime
* 27500 ms - 38000 ms: The killer arrested
* 38000 ms - 43000 ms: Credits
-->
<t>This would translate in the following Matroska form, with the EBML tree shown
as XML:</t>
<figure><name>Basic Chapters Example
</name> </name>
<sourcecode type="xml">&lt;Chapters&gt; <sourcecode type="xml">&lt;Chapters&gt;
&lt;EditionEntry&gt; &lt;EditionEntry&gt;
&lt;EditionUID&gt;16603393396715046047&lt;/EditionUID&gt; &lt;EditionUID&gt;16603393396715046047&lt;/EditionUID&gt;
&lt;ChapterAtom&gt; &lt;ChapterAtom&gt;
&lt;ChapterUID&gt;1193046&lt;/ChapterUID&gt; &lt;ChapterUID&gt;1193046&lt;/ChapterUID&gt;
&lt;ChapterTimeStart&gt;0&lt;/ChapterTimeStart&gt; &lt;ChapterTimeStart&gt;0&lt;/ChapterTimeStart&gt;
&lt;ChapterTimeEnd&gt;5000000000&lt;/ChapterTimeEnd&gt; &lt;ChapterTimeEnd&gt;5000000000&lt;/ChapterTimeEnd&gt;
&lt;ChapterDisplay&gt; &lt;ChapterDisplay&gt;
&lt;ChapString&gt;Intro&lt;/ChapString&gt; &lt;ChapString&gt;Intro&lt;/ChapString&gt;
skipping to change at line 7213 skipping to change at line 7953
&lt;ChapString&gt;Generique&lt;/ChapString&gt; &lt;ChapString&gt;Generique&lt;/ChapString&gt;
&lt;ChapLanguage&gt;fra&lt;/ChapLanguage&gt; &lt;ChapLanguage&gt;fra&lt;/ChapLanguage&gt;
&lt;/ChapterDisplay&gt; &lt;/ChapterDisplay&gt;
&lt;/ChapterAtom&gt; &lt;/ChapterAtom&gt;
&lt;/EditionEntry&gt; &lt;/EditionEntry&gt;
&lt;/Chapters&gt; &lt;/Chapters&gt;
</sourcecode> </sourcecode>
</figure> </figure>
</section> </section>
<section anchor="example-2-nested-chapters"><name>Example 2 : nested chapters</n <section anchor="example-2-nested-chapters"><name>Example 2: Nested Chapters</na
ame> me>
<t>In this example an (existing) album is split into different chapters, and one <t>In this example, an (existing) album is split into different chapters, and on
e
of them contains another splitting.</t> of them contains another splitting.</t>
<section anchor="the-micronauts-bleep-to-bleep"><name>The Micronauts &quot;Bleep To Bleep&quot;</name> <section anchor="the-micronauts-bleep-to-bleep"><name>The Micronauts "Bleep To B leep"</name>
<ul spacing="compact"> <ul spacing="compact">
<li><t>00:00 - 12:28 : Baby Wants To Bleep/Rock</t> <li><t>00:00 - 12:28: Baby wants to Bleep/Rock</t>
<ul spacing="compact"> <ul spacing="compact">
<li>00:00 - 04:38 : Baby wants to bleep (pt.1)</li> <li>00:00 - 04:38: Baby wants to bleep (pt.1)</li>
<li>04:38 - 07:12 : Baby wants to rock</li> <li>04:38 - 07:12: Baby wants to rock</li>
<li>07:12 - 10:33 : Baby wants to bleep (pt.2)</li> <li>07:12 - 10:33: Baby wants to bleep (pt.2)</li>
<li>10:33 - 12:28 : Baby wants to bleep (pt.3)</li> <li>10:33 - 12:28: Baby wants to bleep (pt.3)</li>
</ul></li> </ul></li>
<li>12:30 - 19:38 : Bleeper_O+2</li> <li>12:30 - 19:38: Bleeper_O+2</li>
<li>19:40 - 22:20 : Baby wants to bleep (pt.4)</li> <li>19:40 - 22:20: Baby wants to bleep (pt.4)</li>
<li>22:22 - 25:18 : Bleep to bleep</li> <li>22:22 - 25:18: Bleep to bleep</li>
<li>25:20 - 33:35 : Baby wants to bleep (k)</li> <li>25:20 - 33:35: Baby wants to bleep (k)</li>
<li>33:37 - 44:28 : Bleeper</li> <li>33:37 - 44:28: Bleeper</li>
</ul> </ul>
<t>This would translate in the following matroska form, with the EBML tree shown
as XML :</t> <t>This would translate in the following Matroska form, with the EBML tree shown
<figure><name>Nested Chapters Example. as XML:</t>
<figure><name>Nested Chapters Example
</name> </name>
<sourcecode type="xml">&lt;Chapters&gt; <sourcecode type="xml">&lt;Chapters&gt;
&lt;EditionEntry&gt; &lt;EditionEntry&gt;
&lt;EditionUID&gt;1281690858003401414&lt;/EditionUID&gt; &lt;EditionUID&gt;1281690858003401414&lt;/EditionUID&gt;
&lt;ChapterAtom&gt; &lt;ChapterAtom&gt;
&lt;ChapterUID&gt;1&lt;/ChapterUID&gt; &lt;ChapterUID&gt;1&lt;/ChapterUID&gt;
&lt;ChapterTimeStart&gt;0&lt;/ChapterTimeStart&gt; &lt;ChapterTimeStart&gt;0&lt;/ChapterTimeStart&gt;
&lt;ChapterTimeEnd&gt;748000000&lt;/ChapterTimeEnd&gt; &lt;ChapterTimeEnd&gt;748000000&lt;/ChapterTimeEnd&gt;
&lt;ChapterDisplay&gt; &lt;ChapterDisplay&gt;
&lt;ChapString&gt;Baby wants to Bleep/Rock&lt;/ChapString&gt; &lt;ChapString&gt;Baby wants to Bleep/Rock&lt;/ChapString&gt;
skipping to change at line 7332 skipping to change at line 8072
</sourcecode> </sourcecode>
</figure> </figure>
</section> </section>
</section> </section>
</section> </section>
</section> </section>
<section anchor="attachments-1"><name>Attachments</name> <section anchor="attachments-1"><name>Attachments</name>
<t>Matroska supports storage of related files and data in the <tt>Attachments El ement</tt> <t>Matroska supports storage of related files and data in the <tt>Attachments El ement</tt>
(a <tt>Top-Level Element</tt>). <tt>Attachment Elements</tt> can be used to stor e related cover art, (a <tt>Top-Level Element</tt>). <tt>Attachment Elements</tt> can be used to stor e related cover art,
font files, transcripts, reports, error recovery files, picture, or text-based a nnotations, font files, transcripts, reports, error recovery files, pictures, text-based ann otations,
copies of specifications, or other ancillary files related to the <tt>Segment</t t>.</t> copies of specifications, or other ancillary files related to the <tt>Segment</t t>.</t>
<t><tt>Matroska Readers</tt> <bcp14>MUST NOT</bcp14> execute files stored as <tt >Attachment Elements</tt>.</t> <t><tt>Matroska Readers</tt> <bcp14>MUST NOT</bcp14> execute files stored as <tt >Attachment Elements</tt>.</t>
<section anchor="cover-art"><name>Cover Art</name> <section anchor="cover-art"><name>Cover Art</name>
<t>This section defines a set of guidelines for the storage of cover art in Matr oska files. <t>This section defines a set of guidelines for the storage of cover art in Matr oska files.
A <tt>Matroska Reader</tt> <bcp14>MAY</bcp14> use embedded cover art to display a representational A <tt>Matroska Reader</tt> <bcp14>MAY</bcp14> use embedded cover art to display a representational
still-image depiction of the multimedia contents of the Matroska file.</t> still-image depiction of the multimedia contents of the Matroska file.</t>
<t>Only <xref target="JPEG"></xref> and PNG <xref target="RFC2083"></xref> image formats <bcp14>SHOULD</bcp14> be used for cover art pictures.</t> <t>Only <xref target="JPEG"></xref> and PNG <xref target="RFC2083"></xref> image formats <bcp14>SHOULD</bcp14> be used for cover art pictures.</t>
<t>There can be two different covers for a movie/album: a portrait style (e.g., a DVD case) <t>There can be two different covers for a movie/album: a portrait style (e.g., a DVD case)
and a landscape style (e.g., a wide banner ad).</t> and a landscape style (e.g., a wide banner ad).</t>
<t>There can be two versions of the same cover, the <tt>normal cover</tt> and th <t>There can be two versions of the same cover: the <tt>normal cover</tt> and
e <tt>small cover</tt>. the <tt>small cover</tt>. The dimension of the <tt>normal cover</tt>
The dimension of the <tt>normal cover</tt> <bcp14>SHOULD</bcp14> be 600 pixels o <bcp14>SHOULD</bcp14> be 600 pixels on the smallest side (e.g., 960x600 for
n the smallest side -- for example, landscape, 600x800 for portrait, or 600x600 for square). The dimension of the
960x600 for landscape, 600x800 for portrait, or 600x600 for square. The dimensio <tt>small cover</tt> <bcp14>SHOULD</bcp14> be 120 pixels on the smallest side
n of (e.g., 192x120 or 120x160).</t>
the <tt>small cover</tt> <bcp14>SHOULD</bcp14> be 120 pixels on the smallest sid
e -- for example, 192x120 or 120x160.</t>
<t>Versions of cover art can be differentiated by the filename, which is stored in the <t>Versions of cover art can be differentiated by the filename, which is stored in the
<tt>FileName Element</tt>. The default filename of the <tt>normal cover</tt> in square or portrait mode <tt>FileName Element</tt>. The default filename of the <tt>normal cover</tt> in square or portrait mode
is <tt>cover.(jpg|png)</tt>. When stored, the <tt>normal cover</tt> <bcp14>SHOUL D</bcp14> be the first Attachment in is <tt>cover.(jpg|png)</tt>. When stored, the <tt>normal cover</tt> <bcp14>SHOUL D</bcp14> be the first Attachment in
storage order. The <tt>small cover</tt> <bcp14>SHOULD</bcp14> be prefixed with & storage order. The <tt>small cover</tt> <bcp14>SHOULD</bcp14> be prefixed with "
quot;small_&quot;, such as small_", such as
<tt>small_cover.(jpg|png)</tt>. The landscape variant <bcp14>SHOULD</bcp14> be s <tt>small_cover.(jpg|png)</tt>. The landscape variant <bcp14>SHOULD</bcp14> be s
uffixed with &quot;_land&quot;, uffixed with "_land",
such as <tt>cover_land.(jpg|png)</tt>. The filenames are case-sensitive.</t> such as <tt>cover_land.(jpg|png)</tt>. The filenames are case-sensitive.</t>
<t>The following table provides examples of file names for cover art in Attachme nts.</t> <t>The following table provides examples of file names for cover art in Attachme nts.</t>
<table anchor="coverartFilenames"><name>Cover Art Filenames</name> <table anchor="coverartFilenames"><name>Cover Art Filenames</name>
<thead> <thead>
<tr> <tr>
<th>FileName</th> <th>File Name</th>
<th>Image Orientation</th> <th>Image Orientation</th>
<th>Pixel Length of Smallest Side</th> <th>Pixel Length of Smallest Side</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td>cover.jpg</td> <td>cover.jpg</td>
<td>Portrait or square</td> <td>Portrait or square</td>
<td>600</td> <td>600</td>
skipping to change at line 7390 skipping to change at line 8132
</tr> </tr>
<tr> <tr>
<td>small_cover_land.jpg</td> <td>small_cover_land.jpg</td>
<td>Landscape</td> <td>Landscape</td>
<td>120</td> <td>120</td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table></section>
<section anchor="font-files"><name>Font files</name> <section anchor="font-files"><name>Font Files</name>
<t>Font files <bcp14>MAY</bcp14> be added to a Matroska file as Attachments so t hat the font file may be used <t>Font files <bcp14>MAY</bcp14> be added to a Matroska file as Attachments so t hat the font file may be used
to display an associated subtitle track. This allows the presentation of a Matro ska file to be to display an associated subtitle track. This allows the presentation of a Matro ska file to be
consistent in various environments where the needed fonts might not be available on the local system.</t> consistent in various environments where the needed fonts might not be available on the local system.</t>
<t>Depending on the font format in question, each font file can contain multiple font variants. <t>Depending on the font format in question, each font file can contain multiple font variants.
Each font variant has a name which will be referred to as Font Name from now on. Each font variant has a name that will be referred to as Font Name from now on.
This Font Name can be different from the Attachment's <tt>FileName</tt>, even wh en disregarding the extension. This Font Name can be different from the Attachment's <tt>FileName</tt>, even wh en disregarding the extension.
In order to select a font for display, a Matroska player <bcp14>SHOULD</bcp14> c onsider both the Font Name In order to select a font for display, a Matroska Player <bcp14>SHOULD</bcp14> c onsider both the Font Name
and the base name of the Attachment's FileName, preferring the former when there are multiple matches.</t> and the base name of the Attachment's FileName, preferring the former when there are multiple matches.</t>
<t>Subtitle codecs, such as SubStation Alpha (SSA/ASS), usually refer to a font
by its Font Name, not <!-- [rfced] FYI - We updated "SubStation Alpha (SSA/ASS)" as follows. Please
by its filename. let us know any concerns.
If none of the Attachments are a match for the Font Name, the Matroska player <b
cp14>SHOULD</bcp14> Original:
Subtitle codecs, such as SubStation Alpha (SSA/ASS), usually refer to
a font by its Font Name, not by its filename.
Perhaps:
Subtitle codecs, such as SubStation Alpha (SSA) and Advanced SubStation
Alpha (ASS), usually refer to a font by its Font Name, not by its filename.
-->
<t>Subtitle codecs, such as SubStation Alpha (SSA) and Advanced SubStation Alpha
(ASS), usually refer to a font by its Font Name, not by its filename.
If none of the Attachments are a match for the Font Name, the Matroska Player <b
cp14>SHOULD</bcp14>
attempt to find a system font whose Font Name matches the one used in the subtit le track.</t> attempt to find a system font whose Font Name matches the one used in the subtit le track.</t>
<t>Since loading fonts temporarily can take a while, a Matroska player usually <t>Since loading fonts temporarily can take a while, a Matroska Player usually
loads or installs all the fonts found in attachments so they are ready to be use d during playback. loads or installs all the fonts found in attachments so they are ready to be use d during playback.
Failure to use the font attachment might result in incorrect rendering of the su btitles.</t> Failure to use the font attachment might result in incorrect rendering of the su btitles.</t>
<t>If a selected subtitle track has some <tt>AttachmentLink</tt> elements, the p layer <bcp14>MAY</bcp14> restrict its font rendering to use only these fonts.</t > <t>If a selected subtitle track has some <tt>AttachmentLink</tt> elements, the p layer <bcp14>MAY</bcp14> restrict its font rendering to use only these fonts.</t >
<t>A Matroska player <bcp14>SHOULD</bcp14> handle the official font media types from <xref target="RFC8081"></xref> when the system can handle the type:</t> <t>A Matroska Player <bcp14>SHOULD</bcp14> handle the official font media types from <xref target="RFC8081"></xref> when the system can handle the type:</t>
<ul> <ul>
<li><t><tt>font/sfnt</tt>: Generic SFNT Font Type,</t> <li>font/sfnt: Generic SFNT Font Type</li>
</li> <li>font/ttf: TrueType Font (TTF) Font Type</li>
<li><t><tt>font/ttf</tt>: TTF Font Type,</t> <li>font/otf: OpenType Layout (OTF) Font Type</li>
</li> <li>font/collection: Collection Font Type</li>
<li><t><tt>font/otf</tt>: OpenType Layout (OTF) Font Type,</t> <li>font/woff: WOFF 1.0</li>
</li> <li>font/woff2: WOFF 2.0</li>
<li><t><tt>font/collection</tt>: Collection Font Type,</t>
</li>
<li><t><tt>font/woff</tt>: WOFF 1.0,</t>
</li>
<li><t><tt>font/woff2</tt>: WOFF 2.0.</t>
</li>
</ul> </ul>
<t>Fonts in Matroska existed long before <xref target="RFC8081"></xref>. A few u nofficial media types for fonts were used in existing files. <t>Fonts in Matroska existed long before <xref target="RFC8081"></xref>. A few u nofficial media types for fonts were used in existing files.
Therefore, it is <bcp14>RECOMMENDED</bcp14> for a Matroska player to support the following legacy media types for font attachments:</t> Therefore, it is <bcp14>RECOMMENDED</bcp14> for a Matroska Player to support the following legacy media types for font attachments:</t>
<ul> <ul>
<li><t><tt>application/x-truetype-font</tt>: Truetype fonts, equivalent to <tt>f <li>application/x-truetype-font: TrueType fonts, equivalent to <tt>font/ttf</tt>
ont/ttf</tt> and sometimes <tt>font/otf</tt>,</t> and sometimes <tt>font/otf</tt></li>
</li> <li>application/x-font-ttf: TrueType fonts, equivalent to <tt>font/ttf</tt></li>
<li><t><tt>application/x-font-ttf</tt>: TTF fonts, equivalent to <tt>font/ttf</t <li>application/vnd.ms-opentype: OpenType Layout fonts, equivalent to <tt>font/o
t>,</t> tf</tt></li>
</li> <li>application/font-sfnt: Generic SFNT Font Type, equivalent to <tt>font/sfnt</
<li><t><tt>application/vnd.ms-opentype</tt>: OpenType Layout fonts, equivalent t tt></li>
o <tt>font/otf</tt></t> <li>application/font-woff: WOFF 1.0, equivalent to <tt>font/woff</tt></li>
</li>
<li><t><tt>application/font-sfnt</tt>: Generic SFNT Font Type, equivalent to <tt
>font/sfnt</tt></t>
</li>
<li><t><tt>application/font-woff</tt>: WOFF 1.0, equivalent to <tt>font/woff</tt
></t>
</li>
</ul> </ul>
<t>There may also be some font attachments with the <tt>application/octet-stream </tt> media type. <t>There may also be some font attachments with the <tt>application/octet-stream </tt> media type.
In that case the Matroska player <bcp14>MAY</bcp14> try to guess the font type b y checking the file extension of the <tt>AttachedFile\FileName</tt> string. In that case, the Matroska Player <bcp14>MAY</bcp14> try to guess the font type by checking the file extension of the <tt>AttachedFile\FileName</tt> string.
Common file extensions for fonts are:</t> Common file extensions for fonts are:</t>
<ul> <ul>
<li><t><tt>.ttf</tt> for Truetype fonts, equivalent to <tt>font/ttf</tt>,</t> <li><t><tt>.ttf</tt> for TrueType fonts, equivalent to <tt>font/ttf</tt></t>
</li> </li>
<li><t><tt>.otf</tt> for OpenType Layout fonts, equivalent to <tt>font/otf</tt>, </t> <li><t><tt>.otf</tt> for OpenType Layout fonts, equivalent to <tt>font/otf</tt>< /t>
</li> </li>
<li><t><tt>.ttc</tt> for Collection fonts, equivalent to <tt>font/collection</tt ></t> <li><t><tt>.ttc</tt> for Collection fonts, equivalent to <tt>font/collection</tt ></t>
</li> </li>
</ul> </ul>
<t>The file extension check <bcp14>MUST</bcp14> be case-insensitive.</t> <t>The file extension check <bcp14>MUST</bcp14> be case-insensitive.</t>
<t>Matroska writers <bcp14>SHOULD</bcp14> use a valid font media type from <xref target="RFC8081"></xref> in the <tt>AttachedFile\FileMediaType</tt> of the font attachment. <t>Matroska Writers <bcp14>SHOULD</bcp14> use a valid font media type from <xref target="RFC8081"></xref> in the <tt>AttachedFile\FileMediaType</tt> of the font attachment.
They <bcp14>MAY</bcp14> use the media types found in older files when compatibil ity with older players is necessary.</t> They <bcp14>MAY</bcp14> use the media types found in older files when compatibil ity with older players is necessary.</t>
</section> </section>
</section> </section>
<section anchor="cues"><name>Cues</name> <section anchor="cues"><name>Cues</name>
<t>The <tt>Cues Element</tt> provides an index of certain <tt>Cluster Elements</ tt> to allow for optimized <t>The <tt>Cues Element</tt> provides an index of certain <tt>Cluster Elements</ tt> to allow for optimized
seeking to absolute timestamps within the <tt>Segment</tt>. The <tt>Cues Element </tt> contains one or seeking to absolute timestamps within the <tt>Segment</tt>. The <tt>Cues Element </tt> contains one or
many <tt>CuePoint Elements</tt> which each <bcp14>MUST</bcp14> reference an abso lute timestamp (via the many <tt>CuePoint Elements</tt>, each of which <bcp14>MUST</bcp14> reference an absolute timestamp (via the
<tt>CueTime Element</tt>), a <tt>Track</tt> (via the <tt>CueTrack Element</tt>), and a <tt>Segment Position</tt> <tt>CueTime Element</tt>), a <tt>Track</tt> (via the <tt>CueTrack Element</tt>), and a <tt>Segment Position</tt>
(via the <tt>CueClusterPosition Element</tt>). Additional non-mandated Elements are part of (via the <tt>CueClusterPosition Element</tt>). Additional non-mandated Elements are part of
the <tt>CuePoint Element</tt> such as <tt>CueDuration</tt>, <tt>CueRelativePosit the <tt>CuePoint Element</tt>, such as <tt>CueDuration</tt>, <tt>CueRelativePosi
ion</tt>, <tt>CueCodecState</tt> tion</tt>, <tt>CueCodecState</tt>,
and others which provide any <tt>Matroska Reader</tt> with additional informatio and others that provide any <tt>Matroska Reader</tt> with additional information
n to use in to use in
the optimization of seeking performance.</t> the optimization of seeking performance.</t>
<section anchor="recommendations"><name>Recommendations</name> <section anchor="recommendations"><name>Recommendations</name>
<t>The following recommendations are provided to optimize Matroska performance.< /t> <t>The following recommendations are provided to optimize Matroska performance.< /t>
<ul> <ul>
<li><t>Unless Matroska is used as a live stream, it <bcp14>SHOULD</bcp14> contai n a <tt>Cues Element</tt>.</t> <li><t>Unless Matroska is used as a live stream, it <bcp14>SHOULD</bcp14> contai n a <tt>Cues Element</tt>.</t>
</li> </li>
<li><t>For each video track, each keyframe <bcp14>SHOULD</bcp14> be referenced b y a <tt>CuePoint Element</tt>.</t> <li><t>For each video track, each keyframe <bcp14>SHOULD</bcp14> be referenced b y a <tt>CuePoint Element</tt>.</t>
</li> </li>
<li><t>It is <bcp14>RECOMMENDED</bcp14> to not reference non-keyframes of video tracks in <tt>Cues</tt> unless <li><t>It is <bcp14>RECOMMENDED</bcp14> to not reference non-keyframes of video tracks in <tt>Cues</tt> unless
it references a <tt>Cluster Element</tt> which contains a <tt>CodecState Element </tt> but no keyframes.</t> it references a <tt>Cluster Element</tt> that contains a <tt>CodecState Element< /tt> but no keyframes.</t>
</li> </li>
<li><t>For each subtitle track present, each subtitle frame <bcp14>SHOULD</bcp14 > be referenced by a <li><t>For each subtitle track present, each subtitle frame <bcp14>SHOULD</bcp14 > be referenced by a
<tt>CuePoint Element</tt> with a <tt>CueDuration Element</tt>.</t> <tt>CuePoint Element</tt> with a <tt>CueDuration Element</tt>.</t>
</li> </li>
<li><t>References to audio tracks <bcp14>MAY</bcp14> be skipped in <tt>CuePoint Elements</tt> if a video track <li><t>References to audio tracks <bcp14>MAY</bcp14> be skipped in <tt>CuePoint Elements</tt> if a video track
is present. When included the <tt>CuePoint Elements</tt> <bcp14>SHOULD</bcp14> r is present. When included, the <tt>CuePoint Elements</tt> <bcp14>SHOULD</bcp14>
eference audio keyframes reference audio keyframes
at most once every 500 milliseconds.</t> once every 500 milliseconds at most.</t>
</li> </li>
<li><t>If the referenced frame is not stored within the first <tt>SimpleBlock</t t>, or first <li><t>If the referenced frame is not stored within the first <tt>SimpleBlock</t t> or first
<tt>BlockGroup</tt> within its <tt>Cluster Element</tt>, then the <tt>CueRelativ ePosition Element</tt> <tt>BlockGroup</tt> within its <tt>Cluster Element</tt>, then the <tt>CueRelativ ePosition Element</tt>
<bcp14>SHOULD</bcp14> be written to reference where in the <tt>Cluster</tt> the reference frame is stored.</t> <bcp14>SHOULD</bcp14> be written to reference where in the <tt>Cluster</tt> the reference frame is stored.</t>
</li> </li>
<li><t>If a <tt>CuePoint Element</tt> references <tt>Cluster Element</tt> that i ncludes a <tt>CodecState Element</tt>, <li><t>If a <tt>CuePoint Element</tt> references a <tt>Cluster Element</tt> that includes a <tt>CodecState Element</tt>,
then that <tt>CuePoint Element</tt> <bcp14>MUST</bcp14> use a <tt>CueCodecState Element</tt>.</t> then that <tt>CuePoint Element</tt> <bcp14>MUST</bcp14> use a <tt>CueCodecState Element</tt>.</t>
</li> </li>
<li><t><tt>CuePoint Elements</tt> <bcp14>SHOULD</bcp14> be numerically sorted in storage order by the value of the <tt>CueTime Element</tt>.</t> <li><t><tt>CuePoint Elements</tt> <bcp14>SHOULD</bcp14> be numerically sorted in storage order by the value of the <tt>CueTime Element</tt>.</t>
</li> </li>
</ul> </ul>
</section> </section>
</section> </section>
<section anchor="matroska-streaming"><name>Matroska Streaming</name> <section anchor="matroska-streaming"><name>Matroska Streaming</name>
<t>In Matroska, there are two kinds of streaming: file access and livestreaming. </t> <t>In Matroska, there are two kinds of streaming: file access and livestreaming. </t>
<section anchor="file-access"><name>File Access</name> <section anchor="file-access"><name>File Access</name>
<t>File access can simply be reading a file located on your computer, but also i <t>File access can simply be reading a file located on your computer, but it als
ncludes o includes
accessing a file from an HTTP (web) server or CIFS (Windows share) server. These accessing a file from an HTTP (web) server or Common Internet File System (CIFS)
protocols (Windows share) server. These protocols
are usually safe from reading errors and seeking in the stream is possible. Howe are usually safe from reading errors, and seeking in the stream is possible. How
ver, ever,
when a file is stored far away or on a slow server, seeking can be an expensive operation when a file is stored far away or on a slow server, seeking can be an expensive operation
and should be avoided. The guidelines in <xref target="implementation-recommenda and should be avoided.
tions"></xref>, when followed, help reduce the number <!-- [rfced] Would it be helpful to rephrase the text starting with "without a
lot of data..."?
Original:
The guidelines in Section 25, when followed, help reduce the number
of seeking operations for regular playback and also have the playback start
quickly without a lot of data needed to read first (like a Cues Element,
Attachment Element or SeekHead Element).
Perhaps:
When followed, the guidelines in Section 25 help reduce the number of
seeking operations for regular playback and also have the playback start
quickly without needing to read lot of data first (like a Cues Element,
Attachment Element, or SeekHead Element).
-->
When followed, the guidelines in <xref target="implementation-recommendations"><
/xref> help reduce the number
of seeking operations for regular playback and also have the playback start quic kly without of seeking operations for regular playback and also have the playback start quic kly without
a lot of data needed to read first (like a <tt>Cues Element</tt>, <tt>Attachment Element</tt> or <tt>SeekHead Element</tt>).</t> a lot of data needed to read first (like a <tt>Cues Element</tt>, <tt>Attachment Element</tt>, or <tt>SeekHead Element</tt>).</t>
<t>Matroska, having a small overhead, is well suited for storing music/videos on file <t>Matroska, having a small overhead, is well suited for storing music/videos on file
servers without a big impact on the bandwidth used. Matroska does not require th e index servers without a big impact on the bandwidth used. Matroska does not require th e index
to be loaded before playing, which allows playback to start very quickly. The in dex can to be loaded before playing, which allows playback to start very quickly. The in dex can
be loaded only when seeking is requested the first time.</t> be loaded only when seeking is requested the first time.</t>
</section> </section>
<section anchor="livestreaming"><name>Livestreaming</name> <section anchor="livestreaming"><name>Livestreaming</name>
<t>Livestreaming is the equivalent of television broadcasting on the internet. T <t>Livestreaming is the equivalent of television broadcasting on the Internet. T
here are 2 here are two
families of servers for livestreaming: RTP/RTSP and HTTP. Matroska is not meant families of servers for livestreaming: RTP / Real-Time Streaming Protocol (RTSP)
to be and HTTP. Matroska is not meant to be
used over RTP. RTP already has timing and channel mechanisms that would be waste d if doubled used over RTP. RTP already has timing and channel mechanisms that would be waste d if doubled
in Matroska. Additionally, having the same information at the RTP and Matroska l evel would in Matroska. Additionally, having the same information at the RTP and Matroska l evel would
be a source of confusion if they do not match. be a source of confusion if they do not match.
Livestreaming of Matroska over file-like protocols like HTTP, QUIC, etc. is poss ible.</t> Livestreaming of Matroska over file-like protocols like HTTP, QUIC, etc., is pos sible.</t>
<t>A live Matroska stream is different from a file because it usually has no kno wn end <t>A live Matroska stream is different from a file because it usually has no kno wn end
(only ending when the client disconnects). For this, all bits of the &quot;size& quot; portion (only ending when the client disconnects). For this, all bits of the "size" port ion
of the <tt>Segment Element</tt> <bcp14>MUST</bcp14> be set to 1. Another option is to concatenate <tt>Segment Elements</tt> of the <tt>Segment Element</tt> <bcp14>MUST</bcp14> be set to 1. Another option is to concatenate <tt>Segment Elements</tt>
with known sizes, one after the other. This solution allows a change of codec/re solution with known sizes, one after the other. This solution allows a change of codec/re solution
between each segment. For example, this allows for a switch between 4:3 and 16:9 in a television program.</t> between each segment. For example, this allows for a switch between 4:3 and 16:9 in a television program.</t>
<t>When <tt>Segment Elements</tt> are continuous, certain <tt>Elements</tt>, lik <t>When <tt>Segment Elements</tt> are continuous, certain <tt>Elements</tt> (lik
e <tt>SeekHead</tt>, <tt>Cues</tt>, e <tt>SeekHead</tt>, <tt>Cues</tt>,
<tt>Chapters</tt>, and <tt>Attachments</tt>, <bcp14>MUST NOT</bcp14> be used.</t <tt>Chapters</tt>, and <tt>Attachments</tt>) <bcp14>MUST NOT</bcp14> be used.</t
> >
<t>It is possible for a <tt>Matroska Player</tt> to detect that a stream is not seekable. <t>It is possible for a <tt>Matroska Player</tt> to detect that a stream is not seekable.
If the stream has neither a <tt>SeekHead</tt> list nor a <tt>Cues</tt> list at t he beginning of the stream, If the stream has neither a <tt>SeekHead</tt> list nor a <tt>Cues</tt> list at t he beginning of the stream,
it <bcp14>SHOULD</bcp14> be considered non-seekable. Even though it is possible to seek forward it <bcp14>SHOULD</bcp14> be considered non-seekable. Even though it is possible to seek forward
in the stream, it is <bcp14>NOT RECOMMENDED</bcp14>.</t> in the stream, it is <bcp14>NOT RECOMMENDED</bcp14>.</t>
<t>In the context of live radio or web TV, it is possible to &quot;tag&quot; the content while it is <t>In the context of live radio or web TV, it is possible to "tag" the content w hile it is
playing. The <tt>Tags Element</tt> can be placed between <tt>Clusters</tt> each time it is necessary. playing. The <tt>Tags Element</tt> can be placed between <tt>Clusters</tt> each time it is necessary.
In that case, the new <tt>Tags Element</tt> <bcp14>MUST</bcp14> reset the previo usly encountered <tt>Tags Elements</tt> In that case, the new <tt>Tags Element</tt> <bcp14>MUST</bcp14> reset the previo usly encountered <tt>Tags Elements</tt>
and use the new values instead.</t> and use the new values instead.</t>
</section> </section>
</section> </section>
<section anchor="tags-1"><name>Tags</name> <section anchor="tags-1"><name>Tags</name>
<section anchor="tags-precedence"><name>Tags Precedence</name> <section anchor="tags-precedence"><name>Tags Precedence</name>
<!-- [rfced] Should "Track Name" here be updated to "Name" per Section
5.1.4.1.18? Or is the original okay?
Original:
Some Matroska elements also contain their own string value like the
Track Name (Section 5.1.4.1.18) or the Chapter String
(Section 5.1.7.1.4.10).
...
* The Track Name Element (Section 5.1.4.1.18) corresponds to a tag
with the TagTrackUID (Section 5.1.8.1.1.3) set to the given track,
-->
<!-- [rfced] Similar to the question above, should "Chapter String" be updated
to "ChapString" per Section 5.1.7.1.4.10?
Original:
Some Matroska elements also contain their own string value like the
Track Name (Section 5.1.4.1.18) or the Chapter String
(Section 5.1.7.1.4.10).
...
* The Chapter String Element (Section 5.1.7.1.4.10) corresponds to a
tag with the TagChapterUID
-->
<t>Tags allow tagging all kinds of Matroska parts with very detailed metadata in multiple languages.</t> <t>Tags allow tagging all kinds of Matroska parts with very detailed metadata in multiple languages.</t>
<t>Some Matroska elements also contain their own string value like the Track Nam e (<xref target="name-element"></xref>) or the Chapter String (<xref target="cha pstring-element"></xref>).</t> <t>Some Matroska elements also contain their own string value, like the Track Na me (<xref target="name-element"></xref>) or the Chapter String (<xref target="ch apstring-element"></xref>).</t>
<t>The following Matroska elements can also be defined with tags:</t> <t>The following Matroska elements can also be defined with tags:</t>
<ul> <ul>
<li><t>The Track Name Element (<xref target="name-element"></xref>) corresponds to a tag with the TagTrackUID (<xref target="tagtrackuid-element"></xref>) set t o the given track, a TagName of <tt>TITLE</tt> (<xref target="tagname-element">< /xref>) and a TagLanguage (<xref target="taglanguage-element"></xref>) or TagLan guageBCP47 (<xref target="taglanguagebcp47-element"></xref>) of &quot;und&quot;. </t> <li><t>The Track Name Element (<xref target="name-element"></xref>) corresponds to a tag with the TagTrackUID (<xref target="tagtrackuid-element"></xref>) set t o the given track, a TagName of <tt>TITLE</tt> (<xref target="tagname-element">< /xref>), and a TagLanguage (<xref target="taglanguage-element"></xref>) or TagLa nguageBCP47 (<xref target="taglanguagebcp47-element"></xref>) of "und".</t>
</li> </li>
<li><t>The Chapter String Element (<xref target="chapstring-element"></xref>) co rresponds to a tag with the TagChapterUID (<xref target="tagchapteruid-element"> </xref>) set to the same chapter UID, a TagName of <tt>TITLE</tt> (<xref target= "tagname-element"></xref>) and a TagLanguage (<xref target="taglanguage-element" ></xref>) or TagLanguageBCP47 (<xref target="taglanguagebcp47-element"></xref>) matching the ChapLanguage (<xref target="chaplanguage-element"></xref>) or ChapL anguageBCP47 (<xref target="chaplanguagebcp47-element"></xref>) respectively.</t > <li><t>The Chapter String Element (<xref target="chapstring-element"></xref>) co rresponds to a tag with the TagChapterUID (<xref target="tagchapteruid-element"> </xref>) set to the same chapter UID, a TagName of <tt>TITLE</tt> (<xref target= "tagname-element"></xref>), and a TagLanguage (<xref target="taglanguage-element "></xref>) or TagLanguageBCP47 (<xref target="taglanguagebcp47-element"></xref>) matching the ChapLanguage (<xref target="chaplanguage-element"></xref>) or Chap LanguageBCP47 (<xref target="chaplanguagebcp47-element"></xref>), respectively.< /t>
</li> </li>
<li><t>The FileDescription Element (<xref target="filedescription-element"></xre f>) of an attachment corresponds to a tag with the TagAttachmentUID (<xref targe t="tagattachmentuid-element"></xref>) set to the given attachment, a TagName of <tt>TITLE</tt> (<xref target="tagname-element"></xref>) and a TagLanguage (<xref target="taglanguage-element"></xref>) or TagLanguageBCP47 (<xref target="taglan guagebcp47-element"></xref>) of &quot;und&quot;.</t> <li><t>The FileDescription Element (<xref target="filedescription-element"></xre f>) of an attachment corresponds to a tag with the TagAttachmentUID (<xref targe t="tagattachmentuid-element"></xref>) set to the given attachment, a TagName of <tt>TITLE</tt> (<xref target="tagname-element"></xref>), and a TagLanguage (<xre f target="taglanguage-element"></xref>) or TagLanguageBCP47 (<xref target="tagla nguagebcp47-element"></xref>) of "und".</t>
</li> </li>
</ul> </ul>
<t>When both values exist in the file, the value found in Tags takes precedence <t>When both values exist in the file, the value found in Tags takes precedence
over the value found in original location of the element. over the value found in the original location of the element.
For example, if you have a <tt>TrackEntry\Name</tt> element and Tag <tt>TITLE</t For example, if you have a <tt>TrackEntry\Name</tt> element and Tag <tt>TITLE</t
t> for that track in a Matroska Segment, the Tag string <bcp14>SHOULD</bcp14> be t> for that track in a Matroska Segment, the Tag string <bcp14>SHOULD</bcp14> be
used and not the <tt>TrackEntry\Name</tt> string to identify the track.</t> used instead of the <tt>TrackEntry\Name</tt> string to identify the track.</t>
<t>As the Tag element is optional, a lot of <tt>Matroska Readers</tt> do not han dle it and will not use the tags value when it's found. <t>As the Tag element is optional, a lot of <tt>Matroska Readers</tt> do not han dle it and will not use the tags value when it's found.
So for maximum compatibility, it's usually better to put the strings in the <tt> TrackEntry</tt>, <tt>ChapterAtom</tt> and <tt>Attachment</tt> Thus, for maximum compatibility, it's usually better to put the strings in the < tt>TrackEntry</tt>, <tt>ChapterAtom</tt>, and <tt>Attachment</tt>
and keep the tags matching these values if tags are also used.</t> and keep the tags matching these values if tags are also used.</t>
</section> </section>
<section anchor="tag-levels"><name>Tag Levels</name> <section anchor="tag-levels"><name>Tag Levels</name>
<t>Tag elements allow tagging information on multiple levels, each level having a <tt>TargetTypeValue</tt> <xref target="targettypevalue-element"></xref>. <t>Tag elements allow tagging information on multiple levels, with each level ha ving a <tt>TargetTypeValue</tt> <xref target="targettypevalue-element"></xref>.
An element for a given <tt>TargetTypeValue</tt> also applies to the lower levels denoted by smaller <tt>TargetTypeValue</tt> values. If an upper value An element for a given <tt>TargetTypeValue</tt> also applies to the lower levels denoted by smaller <tt>TargetTypeValue</tt> values. If an upper value
doesn't apply to a level but the actual value to use is not known, doesn't apply to a level but the actual value to use is not known,
an empty <tt>TagString</tt> (<xref target="tagstring-element"></xref>) or an emp an empty <tt>TagString</tt> (<xref target="tagstring-element"></xref>) or an emp
ty <tt>TagBinary</tt> (<xref target="tagbinary-element"></xref>) element <bcp14> ty <tt>TagBinary</tt> (<xref target="tagbinary-element"></xref>) <bcp14>MUST</bc
MUST</bcp14> be used as the tag value for this level.</t> p14> be used as the tag value for this level.</t>
<t>See <xref target="MatroskaTags"></xref> for more details on common tag names, <t>See <xref target="I-D.ietf-cellar-tags"></xref> for more details on common ta
types and descriptions.</t> g names, types, and descriptions.</t>
</section> </section>
</section> </section>
<section anchor="implementation-recommendations"><name>Implementation Recommenda tions</name> <section anchor="implementation-recommendations"><name>Implementation Recommenda tions</name>
<section anchor="cluster"><name>Cluster</name> <section anchor="cluster"><name>Cluster</name>
<t>It is <bcp14>RECOMMENDED</bcp14> that each individual <tt>Cluster Element</tt <t>It is <bcp14>RECOMMENDED</bcp14> that each individual <tt>Cluster Element</tt
> contains no more than > contain no more than
5 seconds or 5 megabytes of content.</t> five seconds or five megabytes of content.</t>
</section> </section>
<section anchor="seekhead-1"><name>SeekHead</name> <section anchor="seekhead-1"><name>SeekHead</name>
<t>It is <bcp14>RECOMMENDED</bcp14> that the first <tt>SeekHead Element</tt> be followed by a <tt>Void Element</tt> to <t>It is <bcp14>RECOMMENDED</bcp14> that the first <tt>SeekHead Element</tt> be followed by a <tt>Void Element</tt> to
allow for the <tt>SeekHead Element</tt> to be expanded to cover new <tt>Top-Leve l Elements</tt> allow for the <tt>SeekHead Element</tt> to be expanded to cover new <tt>Top-Leve l Elements</tt>
that could be added to the Matroska file, such as <tt>Tags</tt>, <tt>Chapters</t t>, and <tt>Attachments</tt> Elements.</t> that could be added to the Matroska file, such as <tt>Tags</tt>, <tt>Chapters</t t>, and <tt>Attachments</tt> Elements.</t>
<!-- [rfced] How may we clarify the text starting with "depending on the..."?
Original:
The size of this Void Element should be adjusted depending on the
Matroska file already having Tags, Chapters, and Attachments
Elements.
Perhaps:
The size of this Void Element should be adjusted depending on the
Tags, Chapters, and Attachments
Elements in the Matroska file.
-->
<t>The size of this <tt>Void Element</tt> should be adjusted depending on the Ma troska file already having <t>The size of this <tt>Void Element</tt> should be adjusted depending on the Ma troska file already having
<tt>Tags</tt>, <tt>Chapters</tt>, and <tt>Attachments</tt> Elements.</t> <tt>Tags</tt>, <tt>Chapters</tt>, and <tt>Attachments</tt> Elements.</t>
</section> </section>
<section anchor="optimum-layouts"><name>Optimum Layouts</name> <section anchor="optimum-layouts"><name>Optimum Layouts</name>
<t>While there can be <tt>Top-Level Elements</tt> in any order, some ordering of <t>While there can be <tt>Top-Level Elements</tt> in any order, some orderings o
Elements are better than others. f Elements are better than others.
Here are few optimum layouts for different use case:</t> The following subsections detail optimum layouts for different use cases.</t>
<section anchor="optimum-layout-for-a-muxer"><name>Optimum layout for a muxer</n <section anchor="optimum-layout-for-a-muxer"><name>Optimum Layout for a Muxer</n
ame> ame>
<t>This is the basic layout muxers should be using for an efficient playback exp <t>This is the basic layout muxers should be using for an efficient playback exp
erience.</t> erience:</t>
<ul spacing="compact"> <ul spacing="compact">
<li>SeekHead</li> <li>SeekHead</li>
<li>Info</li> <li>Info</li>
<li>Tracks</li> <li>Tracks</li>
<li>Chapters</li> <li>Chapters</li>
<li>Attachments</li> <li>Attachments</li>
<li>Tags</li> <li>Tags</li>
<li>Clusters</li> <li>Clusters</li>
<li>Cues</li> <li>Cues</li>
</ul> </ul>
</section> </section>
<section anchor="optimum-layout-after-editing-tags"><name>Optimum layout after e diting tags</name> <section anchor="optimum-layout-after-editing-tags"><name>Optimum Layout after E diting Tags</name>
<t>When tags from the previous layout need to be extended, they are moved to the end with the extra information. <t>When tags from the previous layout need to be extended, they are moved to the end with the extra information.
The location where the old tags were located is voided.</t> The location where the old tags were located is voided.</t>
<ul spacing="compact"> <ul spacing="compact">
<li>SeekHead</li> <li>SeekHead</li>
<li>Info</li> <li>Info</li>
<li>Tracks</li> <li>Tracks</li>
<li>Chapters</li> <li>Chapters</li>
<li>Attachments</li> <li>Attachments</li>
<li>Void</li> <li>Void</li>
<li>Clusters</li> <li>Clusters</li>
<li>Cues</li> <li>Cues</li>
<li>Tags</li> <li>Tags</li>
</ul> </ul>
</section> </section>
<section anchor="optimum-layout-with-cues-at-the-front"><name>Optimum layout wit h Cues at the front</name> <section anchor="optimum-layout-with-cues-at-the-front"><name>Optimum Layout wit h Cues at the Front</name>
<t>Cues are usually a big chunk of data referencing a lot of locations in the fi le. <t>Cues are usually a big chunk of data referencing a lot of locations in the fi le.
For players that want to seek in the file they need to seek to the end of the fi le Players that want to seek in the file need to seek to the end of the file
to access these locations. It is often better if they are placed early in the fi le. to access these locations. It is often better if they are placed early in the fi le.
On the other hand that means players that don't intend to seek will have to read /skip On the other hand, that means players that don't intend to seek will have to rea d/skip
these data no matter what.</t> these data no matter what.</t>
<t>Because the Cues reference locations further in the file, it's often complica ted to <t>Because the Cues reference locations further in the file, it's often complica ted to
allocate the proper space for that element before all the locations are known. allocate the proper space for that element before all the locations are known.
Therefore, this layout is rarely used.</t> Therefore, this layout is rarely used:</t>
<ul spacing="compact"> <ul spacing="compact">
<li>SeekHead</li> <li>SeekHead</li>
<li>Info</li> <li>Info</li>
<li>Tracks</li> <li>Tracks</li>
<li>Chapters</li> <li>Chapters</li>
<li>Attachments</li> <li>Attachments</li>
<li>Tags</li> <li>Tags</li>
<li>Cues</li> <li>Cues</li>
<li>Clusters</li> <li>Clusters</li>
</ul> </ul>
</section> </section>
<section anchor="optimum-layout-for-livestreaming"><name>Optimum layout for live <section anchor="optimum-layout-for-livestreaming"><name>Optimum Layout for Live
streaming</name> streaming</name>
<t>In Livestreaming (<xref target="livestreaming"></xref>) only a few elements m <t>In livestreaming (<xref target="livestreaming"></xref>), only a few elements
ake sense. SeekHead and Cues are useless for example. make sense. For example, SeekHead and Cues are useless.
All elements other than the Clusters <bcp14>MUST</bcp14> be placed before the Cl usters.</t> All elements other than the Clusters <bcp14>MUST</bcp14> be placed before the Cl usters.</t>
<ul spacing="compact"> <ul spacing="compact">
<li>Info</li> <li>Info</li>
<li>Tracks</li> <li>Tracks</li>
<li>Attachments (rare)</li> <li>Attachments (rare)</li>
<li>Tags</li> <li>Tags</li>
<li>Clusters</li> <li>Clusters</li>
</ul> </ul>
</section> </section>
</section> </section>
</section> </section>
<section anchor="security-considerations"><name>Security Considerations</name> <section anchor="security-considerations"><name>Security Considerations</name>
<!-- [rfced] Would it be helpful to include "[RFC8794]" in this sentence in
the Security Considerations section?
Original:
Matroska inherits security considerations from EBML.
Perhaps:
Matroska inherits security considerations from EBML [RFC8794].
-->
<t>Matroska inherits security considerations from EBML.</t> <t>Matroska inherits security considerations from EBML.</t>
<t>Attacks on a <tt>Matroska Reader</tt> could include:</t> <t>Attacks on a <tt>Matroska Reader</tt> could include:</t>
<ul> <ul>
<li><t>Storage of an arbitrary and potentially executable data within an <tt>Att achment Element</tt>. <li><t>Storage of an arbitrary and potentially executable data within an <tt>Att achment Element</tt>.
<tt>Matroska Readers</tt> that extract or use data from Matroska Attachments <bc p14>SHOULD</bcp14> <tt>Matroska Readers</tt> that extract or use data from Matroska Attachments <bc p14>SHOULD</bcp14>
check that the data adheres to expectations or not use the attachement.</t> check that the data adheres to expectations or not use the attachment.</t>
</li> </li>
<li><t>A <tt>Matroska Attachment</tt> with an inaccurate media type.</t> <li><t>A <tt>Matroska Attachment</tt> with an inaccurate media type.</t>
</li> </li>
<li><t>Damage to the Encryption and Compression fields (<xref target="encryption "></xref>) that would result in bogus binary data <li><t>Damage to the Encryption and Compression fields (<xref target="encryption "></xref>) that would result in bogus binary data
interpreted by the decoder.</t> interpreted by the decoder.</t>
</li> </li>
<li><t>Chapter Codecs running unwanted commands on the host system.</t> <li><t>Chapter Codecs running unwanted commands on the host system.</t>
</li> </li>
</ul> </ul>
<!-- [rfced] How may we rephrase this sentence to make it more concise and
clear?
Original:
It is up to the
decision of the Matroska Readers on how to handle the errors if they
are recoverable in their code or not.
Perhaps:
Matroska Readers decide how to handle the errors whether or not they
are recoverable in their code.
-->
<t>The same error handling done for EBML applies to Matroska files. <t>The same error handling done for EBML applies to Matroska files.
Particular error handling is not covered in this specification as this is depend s on the goal of the <tt>Matroska Readers</tt>. Particular error handling is not covered in this specification, as this is depen ds on the goal of the <tt>Matroska Readers</tt>.
It is up to the decision of the <tt>Matroska Readers</tt> on how to handle the e rrors if they are recoverable in their code or not. It is up to the decision of the <tt>Matroska Readers</tt> on how to handle the e rrors if they are recoverable in their code or not.
For example, if the checksum of the <tt>\Segment\Tracks</tt> is invalid some cou For example, if the checksum of the <tt>\Segment\Tracks</tt> is invalid, some co
ld decide to try to read the data anyway, uld decide to try to read the data anyway,
some will just reject the file, most will not even check it.</t> some will just reject the file, and most will not even check it.</t>
<t><tt>Matroska Reader</tt> implementations need to be robust against malicious <t><tt>Matroska Reader</tt> implementations need to be robust against malicious
payloads. payloads. Those related to denial of service are outlined in <xref target="RFC47
Those related to denial of service are outlined in Section 2.1 of [RFC4732].<br 32" sectionFormat="of" section="2.1"/>.</t>
/>
Although rarer, the same may apply to a <tt>Matroska Writer</tt>. Malicious str <t>Although rarer, the same may apply to a <tt>Matroska Writer</tt>. Malicious
eam data stream data
must not cause the Writer to misbehave, as this might allow an attacker access must not cause the Matroska Writer to misbehave, as this might allow an attacker
access
to transcoding gateways.</t> to transcoding gateways.</t>
<t>As an audio and visual container format, a Matroska file or stream will <t>As an audio and visual container format, a Matroska file or stream will
potentially encapsulate numerous byte streams created with a variety of potentially encapsulate numerous byte streams created with a variety of
codecs. Implementers will need to consider the security considerations of codecs. Implementers will need to consider the security considerations of
these encapsulated formats.</t> these encapsulated formats.</t>
</section> </section>
<section anchor="iana-considerations"><name>IANA Considerations</name> <section anchor="iana-considerations"><name>IANA Considerations</name>
<!-- [rfced] We moved "28. Annex A: Historic Deprecated Elements" to be
"Appendix A. Historic Deprecated Elements" (appears after the references
section). If no objections, we will ask IANA to update the section
pointers in the registry defined in Section 27.1 accordingly.
However, if you wish to retain this as Section 28, we will update to
"28. Historic Deprecated Elements" (no "Annex A").
Link to registry: https://www.iana.org/assignments/matroska/matroska.xhtml
-->
<!-- [rfced] We have included some specific questions about the IANA text in
the document. In addition to responding to those questions, please
review all of the IANA-related updates carefully and let us know if any
updates are needed.
a) Section 27.1: Should the list in this sentence include an "Element Name"?
Also, does IANA assign the Element ID? If so, should the sentence be updated
per the "Or" text below to include "Element Name" but not "Element ID"?
Also, please confirm that the Reference is optional.
Original:
To register a new Element ID in this registry, one needs an Element
ID, a Change Controller (IETF or email of registrant) and an optional
Reference to a document describing the Element ID.
Perhaps (both Element ID and Element Name in list):
To register a new Element ID in this registry, one needs an Element
ID, an Element Name, a Change Controller (IETF or email of
registrant), and an optional Reference to a document describing the
Element ID.
Or (Element ID not in list):
To register a new Element ID in this registry, one needs an Element
Name, a Change Controller (IETF or email of
registrant), and an optional Reference to a document describing the
Element ID.
b) Section 27.2: Similar to the question above, should the list in this
sentence include "description" and possibly remove "Chapter Codec ID" from the
list?
Also, please confirm that the Reference is optional.
Original:
To register a new Chapter Codec ID in this registry, one needs a
Chapter Codec ID, a Change Controller (IETF or email of registrant)
and an optional Reference to a document describing the Chapter Codec
ID.
Perhaps (both Chapter Codec ID and description in list):
To register a new Chapter Codec ID in this registry, one needs a
Chapter Codec ID, description, a Change Controller (IETF or email of
registrant), and an optional Reference to a document describing the
Chapter Codec ID.
Or (Chapter Codec ID not in list):
To register a new Chapter Codec ID in this registry, one needs a
description, a Change Controller (IETF or email of
registrant), and an optional Reference to a document describing the
Chapter Codec ID.
c) Would it be helpful to include the ranges listed in the registry at
https://www.iana.org/assignments/matroska/?
Original:
One-octet Matroska Element IDs are to be allocated according to the
"RFC Required" policy [RFC8126].
Two-octet Matroska Element IDs are to be allocated according to the
"Specification Required" policy [RFC8126].
Three-octet and four-octet Matroska Element IDs are to be allocated
according to the "First Come First Served" policy [RFC8126].
Perhaps:
One-octet Element IDs (range 0x00-0xFF) are to be allocated according to the
"RFC Required" policy [RFC8126].
Two-octet Element IDs (range 0x0100-0xFFFF) are to be allocated according
to the "Specification Required" policy [RFC8126].
Three-octet and four-octet Element IDs (range 0x00010000-0xFFFFFFFF) are to
be allocated according to the "First Come First Served" policy [RFC8126].
d) We have combined the text below into one complete sentence. Should "within
a BlockGroup or Chapters" be updated to "BlockGroup or Chapters" (no "within a")
?
Original:
Given the scarcity of the One-octet Element IDs, they should only be
created to save space for elements found many times in a file. For
example, within a BlockGroup or Chapters.
Current:
Given the scarcity of one-octet Element IDs, they should only be
created to save space for elements found many times in a file (for
example, within a BlockGroup or Chapters).
Perhaps:
Given the scarcity of one-octet Element IDs, they should only be
created to save space for elements found many times in a file (for
example, BlockGroup or Chapters).
e) FYI - We removed "Described in" from the Reference column of the table in
Section 27.1 to match the IANA registry at https://www.iana.org/assignments/matr
oska/.
f) The table in Section 27.1 does not contain the "Change Controller" column tha
t appears in the registry at https://www.iana.org/assignments/matroska. Would it
be helpful to add a sentence noting that that the change controller for all ini
tial entries in the registry is "IETF"?
Current:
Table 54 shows the initial contents of the "Matroska Element IDs"
registry.
Perhaps:
Table 54 shows the initial contents of the "Matroska Element IDs"
registry. Note that the Change Controller for all entries in Table 54 is "IET
F".
g) Section 27.2 notes this:
Original:
The values correspond to the unsigned
integer ChapProcessCodecID value described in Section 5.1.7.1.4.15.
...
ChapProcessCodecID values of "0" and "1" are RESERVED to the IETF for
future use.
Values 0 and 1 in the registry are listed as Reserved, with this document as a
reference. See
https://www.iana.org/assignments/matroska/matroska.xhtml#matroska-chapter-codec-
ids.
However, Section 5.1.7.1.4.15 notes this about values "0" and "1" for ChapProces
sCodecID:
Original:
definition: Contains the type of the codec used for the processing.
A value of 0 means built-in Matroska processing (to be defined), a
value of 1 means the DVD command set is used; see Section 20.3 on
DVD menus. More codec IDs can be added later.
Please review and let us know if any updates are needed.
h) Sections 27.3.1-27.3.3: May we update this text to avoid "..." in one of
the following ways? Note that this appears three times (in each of the
templates in Section 27.3).
Original:
FFmpeg, VLC, ...
Perhaps:
FFmpeg, VLC, etc.
Or:
FFmpeg and VLC
i) Sections 27.3.1-27.3.3: We made a few minor edits to the templates in these
sections. Please review and let us know any concerns. We will ask IANA to
update the templates to match the edited document prior to publication:
https://www.iana.org/assignments/media-types/audio/matroska
https://www.iana.org/assignments/media-types/video/matroska
https://www.iana.org/assignments/media-types/video/matroska-3d
-->
<!-- [rfced] We see both "color" (American spelling) and "colour" (British
spelling) used in the document, with the Colour Element registered with
IANA. The document generally uses American spelling (e.g., "optimized"
rather than "optimised", etc.).
Are any updates needed for consistency? Perhaps update all instances to
"color" and request that IANA update the entry in the registry accordingly?
Link to registry: https://www.iana.org/assignments/matroska/matroska.xhtml
-->
<section anchor="matroska-element-ids-registry"><name>Matroska Element IDs Regis try</name> <section anchor="matroska-element-ids-registry"><name>Matroska Element IDs Regis try</name>
<t>This document creates a new IANA registry called the &quot;Matroska Element I Ds&quot; <t>IANA has created a new registry called the "Matroska Element IDs"
registry.</t> registry.</t>
<t>To register a new Element ID in this registry, one needs an Element ID, <t>The following are needed to register a new Element ID in this registry:
a Change Controller (IETF or email of registrant) and an Element ID,
a Change Controller (IETF or email of registrant), and
an optional Reference to a document describing the Element ID.</t> an optional Reference to a document describing the Element ID.</t>
<t>Element IDs are encoded <t>Element IDs are encoded
using the VINT mechanism described in Section 4 of <xref target="RFC8794"></xref using the VINT mechanism described in <xref target="RFC8794" sectionFormat="of"
> and can be between section="4"></xref> and can be between
one and five octets long. Five-octet-long Element IDs are possible one and five octets long. Five-octet Element IDs are possible
only if declared in the EBML header.</t> only if declared in the EBML Header.</t>
<t>Element IDs are described in Section 5 of <xref target="RFC8794"></xref> with <t>Element IDs are described in <xref target="RFC8794" sectionFormat="of" sectio
errata 7189 and 7191.</t> n="5"></xref>, with the changes in <xref target="Err7189"/> and <xref target="Er
<t>One-octet Matroska Element IDs are to be allocated according to the &quot;RFC r7191"/>.</t>
Required&quot; policy <xref target="RFC8126"></xref>.</t> <t>One-octet Matroska Element IDs are to be allocated according to the "RFC Requ
<t>Two-octet Matroska Element IDs are to be allocated according to the &quot;Spe ired" policy <xref target="RFC8126"></xref>.</t>
cification Required&quot; policy <xref target="RFC8126"></xref>.</t> <t>Two-octet Matroska Element IDs are to be allocated according to the "Specific
<t>Three-octet and four-octet Matroska Element IDs are to be allocated according ation Required" policy <xref target="RFC8126"></xref>.</t>
to the &quot;First Come First Served&quot; policy <xref target="RFC8126"></xref <t>Three-octet and four-octet Matroska Element IDs are to be allocated according
>.</t> to the "First Come First Served" policy <xref target="RFC8126"></xref>.</t>
<t>The allowed values in the Elements IDs registry are similar to the ones found <t>The allowed values in the "Matroska Element IDs" registry are similar to the
in the EBML Element IDs registry defined in Section 17.1 of <xref target="RFC879 ones found
4"></xref>.</t> in the "EBML Element IDs" registry defined in <xref target="RFC8794" sectionForm
<t>EBML IDs defined for the EBML Header -- as defined in Section 17.1 of <xref t at="of" section="17.1"></xref>.</t>
arget="RFC8794"></xref> -- <t>EBML Element IDs defined for the EBML Header -- as defined in <xref target="R
<bcp14>MUST NOT</bcp14> be used as Matroska Element IDs.</t> FC8794" sectionFormat="of" section="17.1"></xref> -- <bcp14>MUST NOT</bcp14> be
<t>Given the scarcity of the One-octet Element IDs, they should only be created used as Matroska Element IDs.</t>
to save space for elements found many times in a file.
For example, within a BlockGroup or Chapters. The Four-octet Element IDs are mos <t>Given the scarcity of one-octet Element IDs, they should only be created to s
tly for synchronization of large elements. ave space for elements found many times in a file (for example, within a BlockGr
They should only be used for such high level elements. oup or Chapters). The four-octet Element IDs are mostly for synchronization of l
Elements that are not expected to be used often should use Three-octet Element I arge elements.
Ds.</t> They should only be used for such high-level elements.
<t>Elements found in <xref target="annex-a-historic-deprecated-elements"></xref> Elements that are not expected to be used often should use three-octet Element I
have an assigned Matroska Element ID for historical reasons. Ds.</t>
These elements are not in use and <bcp14>SHOULD NOT</bcp14> be reused unless the <t>Elements found in <xref target="appendix-a-historic-deprecated-elements"></xr
re is no other IDs available with the desired size. ef> have an assigned Matroska Element ID for historical reasons.
Such IDs are considered as <tt>reclaimed</tt> to the IANA registry as they could These elements are not in use and <bcp14>SHOULD NOT</bcp14> be reused unless the
be used for other things in the future.</t> re are no other IDs available with the desired size.
<t>Matroska Element IDs Values found in this document are assigned as initial va Such IDs are marked as "Reclaimed" in the "Matroska Element IDs" registry, as th
lues as follows:</t> ey could be used for other things in the future.</t>
<table><name>IDs and Names for Matroska Element IDs assigned by this document <t><xref target="iana-table"></xref> shows the initial contents of the "Matroska
Element IDs" registry.</t>
<table anchor="iana-table"><name>Initial Contents of "Matroska Element IDs" Regi
stry
</name> </name>
<thead> <thead>
<tr> <tr>
<th align="right">Element ID</th> <th align="right">Element ID</th>
<th align="left">Element Name</th> <th align="left">Element Name</th>
<th align="left">Reference</th> <th align="left">Reference</th>
</tr> </tr>
</thead> </thead>
<tbody> <tbody>
<tr> <tr>
<td align="right">0x80</td> <td align="right">0x80</td>
<td align="left">ChapterDisplay</td> <td align="left">ChapterDisplay</td>
<td align="left">Described in <xref target="chapterdisplay-element"></xref></td> <td align="left">RFC 9559, <xref target="chapterdisplay-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x83</td> <td align="right">0x83</td>
<td align="left">TrackType</td> <td align="left">TrackType</td>
<td align="left">Described in <xref target="tracktype-element"></xref></td> <td align="left">RFC 9559, <xref target="tracktype-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x85</td> <td align="right">0x85</td>
<td align="left">ChapString</td> <td align="left">ChapString</td>
<td align="left">Described in <xref target="chapstring-element"></xref></td> <td align="left">RFC 9559, <xref target="chapstring-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x86</td> <td align="right">0x86</td>
<td align="left">CodecID</td> <td align="left">CodecID</td>
<td align="left">Described in <xref target="codecid-element"></xref></td> <td align="left">RFC 9559, <xref target="codecid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x88</td> <td align="right">0x88</td>
<td align="left">FlagDefault</td> <td align="left">FlagDefault</td>
<td align="left">Described in <xref target="flagdefault-element"></xref></td> <td align="left">RFC 9559, <xref target="flagdefault-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x8E</td> <td align="right">0x8E</td>
<td align="left">Slices</td> <td align="left">Slices</td>
<td align="left">Reclaimed (<xref target="slices-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="slices-element"></xref>)</td >
</tr> </tr>
<tr> <tr>
<td align="right">0x91</td> <td align="right">0x91</td>
<td align="left">ChapterTimeStart</td> <td align="left">ChapterTimeStart</td>
<td align="left">Described in <xref target="chaptertimestart-element"></xref></t d> <td align="left">RFC 9559, <xref target="chaptertimestart-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x92</td> <td align="right">0x92</td>
<td align="left">ChapterTimeEnd</td> <td align="left">ChapterTimeEnd</td>
<td align="left">Described in <xref target="chaptertimeend-element"></xref></td> <td align="left">RFC 9559, <xref target="chaptertimeend-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x96</td> <td align="right">0x96</td>
<td align="left">CueRefTime</td> <td align="left">CueRefTime</td>
<td align="left">Described in <xref target="cuereftime-element"></xref></td> <td align="left">RFC 9559, <xref target="cuereftime-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x97</td> <td align="right">0x97</td>
<td align="left">CueRefCluster</td> <td align="left">CueRefCluster</td>
<td align="left">Reclaimed (<xref target="cuerefcluster-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="cuerefcluster-element"></xre f>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x98</td> <td align="right">0x98</td>
<td align="left">ChapterFlagHidden</td> <td align="left">ChapterFlagHidden</td>
<td align="left">Described in <xref target="chapterflaghidden-element"></xref></ td> <td align="left">RFC 9559, <xref target="chapterflaghidden-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x9A</td> <td align="right">0x9A</td>
<td align="left">FlagInterlaced</td> <td align="left">FlagInterlaced</td>
<td align="left">Described in <xref target="flaginterlaced-element"></xref></td> <td align="left">RFC 9559, <xref target="flaginterlaced-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x9B</td> <td align="right">0x9B</td>
<td align="left">BlockDuration</td> <td align="left">BlockDuration</td>
<td align="left">Described in <xref target="blockduration-element"></xref></td> <td align="left">RFC 9559, <xref target="blockduration-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x9C</td> <td align="right">0x9C</td>
<td align="left">FlagLacing</td> <td align="left">FlagLacing</td>
<td align="left">Described in <xref target="flaglacing-element"></xref></td> <td align="left">RFC 9559, <xref target="flaglacing-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x9D</td> <td align="right">0x9D</td>
<td align="left">FieldOrder</td> <td align="left">FieldOrder</td>
<td align="left">Described in <xref target="fieldorder-element"></xref></td> <td align="left">RFC 9559, <xref target="fieldorder-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x9F</td> <td align="right">0x9F</td>
<td align="left">Channels</td> <td align="left">Channels</td>
<td align="left">Described in <xref target="channels-element"></xref></td> <td align="left">RFC 9559, <xref target="channels-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA0</td> <td align="right">0xA0</td>
<td align="left">BlockGroup</td> <td align="left">BlockGroup</td>
<td align="left">Described in <xref target="blockgroup-element"></xref></td> <td align="left">RFC 9559, <xref target="blockgroup-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA1</td> <td align="right">0xA1</td>
<td align="left">Block</td> <td align="left">Block</td>
<td align="left">Described in <xref target="block-element"></xref></td> <td align="left">RFC 9559, <xref target="block-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA2</td> <td align="right">0xA2</td>
<td align="left">BlockVirtual</td> <td align="left">BlockVirtual</td>
<td align="left">Reclaimed (<xref target="blockvirtual-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="blockvirtual-element"></xref >)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA3</td> <td align="right">0xA3</td>
<td align="left">SimpleBlock</td> <td align="left">SimpleBlock</td>
<td align="left">Described in <xref target="simpleblock-element"></xref></td> <td align="left">RFC 9559, <xref target="simpleblock-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA4</td> <td align="right">0xA4</td>
<td align="left">CodecState</td> <td align="left">CodecState</td>
<td align="left">Described in <xref target="codecstate-element"></xref></td> <td align="left">RFC 9559, <xref target="codecstate-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA5</td> <td align="right">0xA5</td>
<td align="left">BlockAdditional</td> <td align="left">BlockAdditional</td>
<td align="left">Described in <xref target="blockadditional-element"></xref></td > <td align="left">RFC 9559, <xref target="blockadditional-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA6</td> <td align="right">0xA6</td>
<td align="left">BlockMore</td> <td align="left">BlockMore</td>
<td align="left">Described in <xref target="blockmore-element"></xref></td> <td align="left">RFC 9559, <xref target="blockmore-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xA7</td> <td align="right">0xA7</td>
<td align="left">Position</td> <td align="left">Position</td>
<td align="left">Described in <xref target="position-element"></xref></td> <td align="left">RFC 9559, <xref target="position-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xAA</td> <td align="right">0xAA</td>
<td align="left">CodecDecodeAll</td> <td align="left">CodecDecodeAll</td>
<td align="left">Reclaimed (<xref target="codecdecodeall-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="codecdecodeall-element"></xr ef>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xAB</td> <td align="right">0xAB</td>
<td align="left">PrevSize</td> <td align="left">PrevSize</td>
<td align="left">Described in <xref target="prevsize-element"></xref></td> <td align="left">RFC 9559, <xref target="prevsize-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xAE</td> <td align="right">0xAE</td>
<td align="left">TrackEntry</td> <td align="left">TrackEntry</td>
<td align="left">Described in <xref target="trackentry-element"></xref></td> <td align="left">RFC 9559, <xref target="trackentry-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xAF</td> <td align="right">0xAF</td>
<td align="left">EncryptedBlock</td> <td align="left">EncryptedBlock</td>
<td align="left">Reclaimed (<xref target="encryptedblock-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="encryptedblock-element"></xr ef>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xB0</td> <td align="right">0xB0</td>
<td align="left">PixelWidth</td> <td align="left">PixelWidth</td>
<td align="left">Described in <xref target="pixelwidth-element"></xref></td> <td align="left">RFC 9559, <xref target="pixelwidth-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xB2</td> <td align="right">0xB2</td>
<td align="left">CueDuration</td> <td align="left">CueDuration</td>
<td align="left">Described in <xref target="cueduration-element"></xref></td> <td align="left">RFC 9559, <xref target="cueduration-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xB3</td> <td align="right">0xB3</td>
<td align="left">CueTime</td> <td align="left">CueTime</td>
<td align="left">Described in <xref target="cuetime-element"></xref></td> <td align="left">RFC 9559, <xref target="cuetime-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xB5</td> <td align="right">0xB5</td>
<td align="left">SamplingFrequency</td> <td align="left">SamplingFrequency</td>
<td align="left">Described in <xref target="samplingfrequency-element"></xref></ td> <td align="left">RFC 9559, <xref target="samplingfrequency-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xB6</td> <td align="right">0xB6</td>
<td align="left">ChapterAtom</td> <td align="left">ChapterAtom</td>
<td align="left">Described in <xref target="chapteratom-element"></xref></td> <td align="left">RFC 9559, <xref target="chapteratom-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xB7</td> <td align="right">0xB7</td>
<td align="left">CueTrackPositions</td> <td align="left">CueTrackPositions</td>
<td align="left">Described in <xref target="cuetrackpositions-element"></xref></ td> <td align="left">RFC 9559, <xref target="cuetrackpositions-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xB9</td> <td align="right">0xB9</td>
<td align="left">FlagEnabled</td> <td align="left">FlagEnabled</td>
<td align="left">Described in <xref target="flagenabled-element"></xref></td> <td align="left">RFC 9559, <xref target="flagenabled-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xBA</td> <td align="right">0xBA</td>
<td align="left">PixelHeight</td> <td align="left">PixelHeight</td>
<td align="left">Described in <xref target="pixelheight-element"></xref></td> <td align="left">RFC 9559, <xref target="pixelheight-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xBB</td> <td align="right">0xBB</td>
<td align="left">CuePoint</td> <td align="left">CuePoint</td>
<td align="left">Described in <xref target="cuepoint-element"></xref></td> <td align="left">RFC 9559, <xref target="cuepoint-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xC0</td> <td align="right">0xC0</td>
<td align="left">TrickTrackUID</td> <td align="left">TrickTrackUID</td>
<td align="left">Reclaimed (<xref target="tricktrackuid-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="tricktrackuid-element"></xre f>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xC1</td> <td align="right">0xC1</td>
<td align="left">TrickTrackSegmentUID</td> <td align="left">TrickTrackSegmentUID</td>
<td align="left">Reclaimed (<xref target="tricktracksegmentuid-element"></xref>) </td> <td align="left">Reclaimed (RFC 9559, <xref target="tricktracksegmentuid-element "></xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xC4</td> <td align="right">0xC4</td>
<td align="left">TrickMasterTrackSegmentUID</td> <td align="left">TrickMasterTrackSegmentUID</td>
<td align="left">Reclaimed (<xref target="trickmastertracksegmentuid-element"></ xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="trickmastertracksegmentuid-e lement"></xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xC6</td> <td align="right">0xC6</td>
<td align="left">TrickTrackFlag</td> <td align="left">TrickTrackFlag</td>
<td align="left">Reclaimed (<xref target="tricktrackflag-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="tricktrackflag-element"></xr ef>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xC7</td> <td align="right">0xC7</td>
<td align="left">TrickMasterTrackUID</td> <td align="left">TrickMasterTrackUID</td>
<td align="left">Reclaimed (<xref target="trickmastertrackuid-element"></xref>)< /td> <td align="left">Reclaimed (RFC 9559, <xref target="trickmastertrackuid-element" ></xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xC8</td> <td align="right">0xC8</td>
<td align="left">ReferenceFrame</td> <td align="left">ReferenceFrame</td>
<td align="left">Reclaimed (<xref target="referenceframe-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="referenceframe-element"></xr ef>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xC9</td> <td align="right">0xC9</td>
<td align="left">ReferenceOffset</td> <td align="left">ReferenceOffset</td>
<td align="left">Reclaimed (<xref target="referenceoffset-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="referenceoffset-element"></x ref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xCA</td> <td align="right">0xCA</td>
<td align="left">ReferenceTimestamp</td> <td align="left">ReferenceTimestamp</td>
<td align="left">Reclaimed (<xref target="referencetimestamp-element"></xref>)</ td> <td align="left">Reclaimed (RFC 9559, <xref target="referencetimestamp-element"> </xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xCB</td> <td align="right">0xCB</td>
<td align="left">BlockAdditionID</td> <td align="left">BlockAdditionID</td>
<td align="left">Reclaimed (<xref target="blockadditionid-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="blockadditionid-element"></x ref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xCC</td> <td align="right">0xCC</td>
<td align="left">LaceNumber</td> <td align="left">LaceNumber</td>
<td align="left">Reclaimed (<xref target="lacenumber-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="lacenumber-element"></xref>) </td>
</tr> </tr>
<tr> <tr>
<td align="right">0xCD</td> <td align="right">0xCD</td>
<td align="left">FrameNumber</td> <td align="left">FrameNumber</td>
<td align="left">Reclaimed (<xref target="framenumber-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="framenumber-element"></xref> )</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xCE</td> <td align="right">0xCE</td>
<td align="left">Delay</td> <td align="left">Delay</td>
<td align="left">Reclaimed (<xref target="delay-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="delay-element"></xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xCF</td> <td align="right">0xCF</td>
<td align="left">SliceDuration</td> <td align="left">SliceDuration</td>
<td align="left">Reclaimed (<xref target="sliceduration-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="sliceduration-element"></xre f>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xD7</td> <td align="right">0xD7</td>
<td align="left">TrackNumber</td> <td align="left">TrackNumber</td>
<td align="left">Described in <xref target="tracknumber-element"></xref></td> <td align="left">RFC 9559, <xref target="tracknumber-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xDB</td> <td align="right">0xDB</td>
<td align="left">CueReference</td> <td align="left">CueReference</td>
<td align="left">Described in <xref target="cuereference-element"></xref></td> <td align="left">RFC 9559, <xref target="cuereference-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE0</td> <td align="right">0xE0</td>
<td align="left">Video</td> <td align="left">Video</td>
<td align="left">Described in <xref target="video-element"></xref></td> <td align="left">RFC 9559, <xref target="video-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE1</td> <td align="right">0xE1</td>
<td align="left">Audio</td> <td align="left">Audio</td>
<td align="left">Described in <xref target="audio-element"></xref></td> <td align="left">RFC 9559, <xref target="audio-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE2</td> <td align="right">0xE2</td>
<td align="left">TrackOperation</td> <td align="left">TrackOperation</td>
<td align="left">Described in <xref target="trackoperation-element"></xref></td> <td align="left">RFC 9559, <xref target="trackoperation-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE3</td> <td align="right">0xE3</td>
<td align="left">TrackCombinePlanes</td> <td align="left">TrackCombinePlanes</td>
<td align="left">Described in <xref target="trackcombineplanes-element"></xref>< /td> <td align="left">RFC 9559, <xref target="trackcombineplanes-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0xE4</td> <td align="right">0xE4</td>
<td align="left">TrackPlane</td> <td align="left">TrackPlane</td>
<td align="left">Described in <xref target="trackplane-element"></xref></td> <td align="left">RFC 9559, <xref target="trackplane-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE5</td> <td align="right">0xE5</td>
<td align="left">TrackPlaneUID</td> <td align="left">TrackPlaneUID</td>
<td align="left">Described in <xref target="trackplaneuid-element"></xref></td> <td align="left">RFC 9559, <xref target="trackplaneuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE6</td> <td align="right">0xE6</td>
<td align="left">TrackPlaneType</td> <td align="left">TrackPlaneType</td>
<td align="left">Described in <xref target="trackplanetype-element"></xref></td> <td align="left">RFC 9559, <xref target="trackplanetype-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE7</td> <td align="right">0xE7</td>
<td align="left">Timestamp</td> <td align="left">Timestamp</td>
<td align="left">Described in <xref target="timestamp-element"></xref></td> <td align="left">RFC 9559, <xref target="timestamp-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE8</td> <td align="right">0xE8</td>
<td align="left">TimeSlice</td> <td align="left">TimeSlice</td>
<td align="left">Reclaimed (<xref target="timeslice-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="timeslice-element"></xref>)< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0xE9</td> <td align="right">0xE9</td>
<td align="left">TrackJoinBlocks</td> <td align="left">TrackJoinBlocks</td>
<td align="left">Described in <xref target="trackjoinblocks-element"></xref></td > <td align="left">RFC 9559, <xref target="trackjoinblocks-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xEA</td> <td align="right">0xEA</td>
<td align="left">CueCodecState</td> <td align="left">CueCodecState</td>
<td align="left">Described in <xref target="cuecodecstate-element"></xref></td> <td align="left">RFC 9559, <xref target="cuecodecstate-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xEB</td> <td align="right">0xEB</td>
<td align="left">CueRefCodecState</td> <td align="left">CueRefCodecState</td>
<td align="left">Reclaimed (<xref target="cuerefcodecstate-element"></xref>)</td > <td align="left">Reclaimed (RFC 9559, <xref target="cuerefcodecstate-element"></ xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0xED</td> <td align="right">0xED</td>
<td align="left">TrackJoinUID</td> <td align="left">TrackJoinUID</td>
<td align="left">Described in <xref target="trackjoinuid-element"></xref></td> <td align="left">RFC 9559, <xref target="trackjoinuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xEE</td> <td align="right">0xEE</td>
<td align="left">BlockAddID</td> <td align="left">BlockAddID</td>
<td align="left">Described in <xref target="blockaddid-element"></xref></td> <td align="left">RFC 9559, <xref target="blockaddid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xF0</td> <td align="right">0xF0</td>
<td align="left">CueRelativePosition</td> <td align="left">CueRelativePosition</td>
<td align="left">Described in <xref target="cuerelativeposition-element"></xref> </td> <td align="left">RFC 9559, <xref target="cuerelativeposition-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0xF1</td> <td align="right">0xF1</td>
<td align="left">CueClusterPosition</td> <td align="left">CueClusterPosition</td>
<td align="left">Described in <xref target="cueclusterposition-element"></xref>< /td> <td align="left">RFC 9559, <xref target="cueclusterposition-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0xF7</td> <td align="right">0xF7</td>
<td align="left">CueTrack</td> <td align="left">CueTrack</td>
<td align="left">Described in <xref target="cuetrack-element"></xref></td> <td align="left">RFC 9559, <xref target="cuetrack-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xFA</td> <td align="right">0xFA</td>
<td align="left">ReferencePriority</td> <td align="left">ReferencePriority</td>
<td align="left">Described in <xref target="referencepriority-element"></xref></ td> <td align="left">RFC 9559, <xref target="referencepriority-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xFB</td> <td align="right">0xFB</td>
<td align="left">ReferenceBlock</td> <td align="left">ReferenceBlock</td>
<td align="left">Described in <xref target="referenceblock-element"></xref></td> <td align="left">RFC 9559, <xref target="referenceblock-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0xFD</td> <td align="right">0xFD</td>
<td align="left">ReferenceVirtual</td> <td align="left">ReferenceVirtual</td>
<td align="left">Reclaimed (<xref target="referencevirtual-element"></xref>)</td > <td align="left">Reclaimed (RFC 9559, <xref target="referencevirtual-element"></ xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x41A4</td> <td align="right">0x41A4</td>
<td align="left">BlockAddIDName</td> <td align="left">BlockAddIDName</td>
<td align="left">Described in <xref target="blockaddidname-element"></xref></td> <td align="left">RFC 9559, <xref target="blockaddidname-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x41E4</td> <td align="right">0x41E4</td>
<td align="left">BlockAdditionMapping</td> <td align="left">BlockAdditionMapping</td>
<td align="left">Described in <xref target="blockadditionmapping-element"></xref ></td> <td align="left">RFC 9559, <xref target="blockadditionmapping-element"></xref></ td>
</tr> </tr>
<tr> <tr>
<td align="right">0x41E7</td> <td align="right">0x41E7</td>
<td align="left">BlockAddIDType</td> <td align="left">BlockAddIDType</td>
<td align="left">Described in <xref target="blockaddidtype-element"></xref></td> <td align="left">RFC 9559, <xref target="blockaddidtype-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x41ED</td> <td align="right">0x41ED</td>
<td align="left">BlockAddIDExtraData</td> <td align="left">BlockAddIDExtraData</td>
<td align="left">Described in <xref target="blockaddidextradata-element"></xref> </td> <td align="left">RFC 9559, <xref target="blockaddidextradata-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0x41F0</td> <td align="right">0x41F0</td>
<td align="left">BlockAddIDValue</td> <td align="left">BlockAddIDValue</td>
<td align="left">Described in <xref target="blockaddidvalue-element"></xref></td > <td align="left">RFC 9559, <xref target="blockaddidvalue-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4254</td> <td align="right">0x4254</td>
<td align="left">ContentCompAlgo</td> <td align="left">ContentCompAlgo</td>
<td align="left">Described in <xref target="contentcompalgo-element"></xref></td > <td align="left">RFC 9559, <xref target="contentcompalgo-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4255</td> <td align="right">0x4255</td>
<td align="left">ContentCompSettings</td> <td align="left">ContentCompSettings</td>
<td align="left">Described in <xref target="contentcompsettings-element"></xref> </td> <td align="left">RFC 9559, <xref target="contentcompsettings-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0x437C</td> <td align="right">0x437C</td>
<td align="left">ChapLanguage</td> <td align="left">ChapLanguage</td>
<td align="left">Described in <xref target="chaplanguage-element"></xref></td> <td align="left">RFC 9559, <xref target="chaplanguage-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x437D</td> <td align="right">0x437D</td>
<td align="left">ChapLanguageBCP47</td> <td align="left">ChapLanguageBCP47</td>
<td align="left">Described in <xref target="chaplanguagebcp47-element"></xref></ td> <td align="left">RFC 9559, <xref target="chaplanguagebcp47-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x437E</td> <td align="right">0x437E</td>
<td align="left">ChapCountry</td> <td align="left">ChapCountry</td>
<td align="left">Described in <xref target="chapcountry-element"></xref></td> <td align="left">RFC 9559, <xref target="chapcountry-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4444</td> <td align="right">0x4444</td>
<td align="left">SegmentFamily</td> <td align="left">SegmentFamily</td>
<td align="left">Described in <xref target="segmentfamily-element"></xref></td> <td align="left">RFC 9559, <xref target="segmentfamily-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4461</td> <td align="right">0x4461</td>
<td align="left">DateUTC</td> <td align="left">DateUTC</td>
<td align="left">Described in <xref target="dateutc-element"></xref></td> <td align="left">RFC 9559, <xref target="dateutc-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x447A</td> <td align="right">0x447A</td>
<td align="left">TagLanguage</td> <td align="left">TagLanguage</td>
<td align="left">Described in <xref target="taglanguage-element"></xref></td> <td align="left">RFC 9559, <xref target="taglanguage-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x447B</td> <td align="right">0x447B</td>
<td align="left">TagLanguageBCP47</td> <td align="left">TagLanguageBCP47</td>
<td align="left">Described in <xref target="taglanguagebcp47-element"></xref></t d> <td align="left">RFC 9559, <xref target="taglanguagebcp47-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4484</td> <td align="right">0x4484</td>
<td align="left">TagDefault</td> <td align="left">TagDefault</td>
<td align="left">Described in <xref target="tagdefault-element"></xref></td> <td align="left">RFC 9559, <xref target="tagdefault-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4485</td> <td align="right">0x4485</td>
<td align="left">TagBinary</td> <td align="left">TagBinary</td>
<td align="left">Described in <xref target="tagbinary-element"></xref></td> <td align="left">RFC 9559, <xref target="tagbinary-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4487</td> <td align="right">0x4487</td>
<td align="left">TagString</td> <td align="left">TagString</td>
<td align="left">Described in <xref target="tagstring-element"></xref></td> <td align="left">RFC 9559, <xref target="tagstring-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4489</td> <td align="right">0x4489</td>
<td align="left">Duration</td> <td align="left">Duration</td>
<td align="left">Described in <xref target="duration-element"></xref></td> <td align="left">RFC 9559, <xref target="duration-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x44B4</td> <td align="right">0x44B4</td>
<td align="left">TagDefaultBogus</td> <td align="left">TagDefaultBogus</td>
<td align="left">Reclaimed (<xref target="tagdefaultbogus-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="tagdefaultbogus-element"></x ref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x450D</td> <td align="right">0x450D</td>
<td align="left">ChapProcessPrivate</td> <td align="left">ChapProcessPrivate</td>
<td align="left">Described in <xref target="chapprocessprivate-element"></xref>< /td> <td align="left">RFC 9559, <xref target="chapprocessprivate-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x45A3</td> <td align="right">0x45A3</td>
<td align="left">TagName</td> <td align="left">TagName</td>
<td align="left">Described in <xref target="tagname-element"></xref></td> <td align="left">RFC 9559, <xref target="tagname-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x45B9</td> <td align="right">0x45B9</td>
<td align="left">EditionEntry</td> <td align="left">EditionEntry</td>
<td align="left">Described in <xref target="editionentry-element"></xref></td> <td align="left">RFC 9559, <xref target="editionentry-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x45BC</td> <td align="right">0x45BC</td>
<td align="left">EditionUID</td> <td align="left">EditionUID</td>
<td align="left">Described in <xref target="editionuid-element"></xref></td> <td align="left">RFC 9559, <xref target="editionuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x45DB</td> <td align="right">0x45DB</td>
<td align="left">EditionFlagDefault</td> <td align="left">EditionFlagDefault</td>
<td align="left">Described in <xref target="editionflagdefault-element"></xref>< /td> <td align="left">RFC 9559, <xref target="editionflagdefault-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x45DD</td> <td align="right">0x45DD</td>
<td align="left">EditionFlagOrdered</td> <td align="left">EditionFlagOrdered</td>
<td align="left">Described in <xref target="editionflagordered-element"></xref>< /td> <td align="left">RFC 9559, <xref target="editionflagordered-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x465C</td> <td align="right">0x465C</td>
<td align="left">FileData</td> <td align="left">FileData</td>
<td align="left">Described in <xref target="filedata-element"></xref></td> <td align="left">RFC 9559, <xref target="filedata-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4660</td> <td align="right">0x4660</td>
<td align="left">FileMediaType</td> <td align="left">FileMediaType</td>
<td align="left">Described in <xref target="filemediatype-element"></xref></td> <td align="left">RFC 9559, <xref target="filemediatype-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4661</td> <td align="right">0x4661</td>
<td align="left">FileUsedStartTime</td> <td align="left">FileUsedStartTime</td>
<td align="left">Reclaimed (<xref target="fileusedstarttime-element"></xref>)</t d> <td align="left">Reclaimed (RFC 9559, <xref target="fileusedstarttime-element">< /xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4662</td> <td align="right">0x4662</td>
<td align="left">FileUsedEndTime</td> <td align="left">FileUsedEndTime</td>
<td align="left">Reclaimed (<xref target="fileusedendtime-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="fileusedendtime-element"></x ref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x466E</td> <td align="right">0x466E</td>
<td align="left">FileName</td> <td align="left">FileName</td>
<td align="left">Described in <xref target="filename-element"></xref></td> <td align="left">RFC 9559, <xref target="filename-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4675</td> <td align="right">0x4675</td>
<td align="left">FileReferral</td> <td align="left">FileReferral</td>
<td align="left">Reclaimed (<xref target="filereferral-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="filereferral-element"></xref >)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x467E</td> <td align="right">0x467E</td>
<td align="left">FileDescription</td> <td align="left">FileDescription</td>
<td align="left">Described in <xref target="filedescription-element"></xref></td > <td align="left">RFC 9559, <xref target="filedescription-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x46AE</td> <td align="right">0x46AE</td>
<td align="left">FileUID</td> <td align="left">FileUID</td>
<td align="left">Described in <xref target="fileuid-element"></xref></td> <td align="left">RFC 9559, <xref target="fileuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E1</td> <td align="right">0x47E1</td>
<td align="left">ContentEncAlgo</td> <td align="left">ContentEncAlgo</td>
<td align="left">Described in <xref target="contentencalgo-element"></xref></td> <td align="left">RFC 9559, <xref target="contentencalgo-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E2</td> <td align="right">0x47E2</td>
<td align="left">ContentEncKeyID</td> <td align="left">ContentEncKeyID</td>
<td align="left">Described in <xref target="contentenckeyid-element"></xref></td > <td align="left">RFC 9559, <xref target="contentenckeyid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E3</td> <td align="right">0x47E3</td>
<td align="left">ContentSignature</td> <td align="left">ContentSignature</td>
<td align="left">Reclaimed (<xref target="contentsignature-element"></xref>)</td > <td align="left">Reclaimed (RFC 9559, <xref target="contentsignature-element"></ xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E4</td> <td align="right">0x47E4</td>
<td align="left">ContentSigKeyID</td> <td align="left">ContentSigKeyID</td>
<td align="left">Reclaimed (<xref target="contentsigkeyid-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="contentsigkeyid-element"></x ref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E5</td> <td align="right">0x47E5</td>
<td align="left">ContentSigAlgo</td> <td align="left">ContentSigAlgo</td>
<td align="left">Reclaimed (<xref target="contentsigalgo-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="contentsigalgo-element"></xr ef>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E6</td> <td align="right">0x47E6</td>
<td align="left">ContentSigHashAlgo</td> <td align="left">ContentSigHashAlgo</td>
<td align="left">Reclaimed (<xref target="contentsighashalgo-element"></xref>)</ td> <td align="left">Reclaimed (RFC 9559, <xref target="contentsighashalgo-element"> </xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E7</td> <td align="right">0x47E7</td>
<td align="left">ContentEncAESSettings</td> <td align="left">ContentEncAESSettings</td>
<td align="left">Described in <xref target="contentencaessettings-element"></xre f></td> <td align="left">RFC 9559, <xref target="contentencaessettings-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x47E8</td> <td align="right">0x47E8</td>
<td align="left">AESSettingsCipherMode</td> <td align="left">AESSettingsCipherMode</td>
<td align="left">Described in <xref target="aessettingsciphermode-element"></xre f></td> <td align="left">RFC 9559, <xref target="aessettingsciphermode-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4D80</td> <td align="right">0x4D80</td>
<td align="left">MuxingApp</td> <td align="left">MuxingApp</td>
<td align="left">Described in <xref target="muxingapp-element"></xref></td> <td align="left">RFC 9559, <xref target="muxingapp-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x4DBB</td> <td align="right">0x4DBB</td>
<td align="left">Seek</td> <td align="left">Seek</td>
<td align="left">Described in <xref target="seek-element"></xref></td> <td align="left">RFC 9559, <xref target="seek-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x5031</td> <td align="right">0x5031</td>
<td align="left">ContentEncodingOrder</td> <td align="left">ContentEncodingOrder</td>
<td align="left">Described in <xref target="contentencodingorder-element"></xref ></td> <td align="left">RFC 9559, <xref target="contentencodingorder-element"></xref></ td>
</tr> </tr>
<tr> <tr>
<td align="right">0x5032</td> <td align="right">0x5032</td>
<td align="left">ContentEncodingScope</td> <td align="left">ContentEncodingScope</td>
<td align="left">Described in <xref target="contentencodingscope-element"></xref ></td> <td align="left">RFC 9559, <xref target="contentencodingscope-element"></xref></ td>
</tr> </tr>
<tr> <tr>
<td align="right">0x5033</td> <td align="right">0x5033</td>
<td align="left">ContentEncodingType</td> <td align="left">ContentEncodingType</td>
<td align="left">Described in <xref target="contentencodingtype-element"></xref> </td> <td align="left">RFC 9559, <xref target="contentencodingtype-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0x5034</td> <td align="right">0x5034</td>
<td align="left">ContentCompression</td> <td align="left">ContentCompression</td>
<td align="left">Described in <xref target="contentcompression-element"></xref>< /td> <td align="left">RFC 9559, <xref target="contentcompression-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x5035</td> <td align="right">0x5035</td>
<td align="left">ContentEncryption</td> <td align="left">ContentEncryption</td>
<td align="left">Described in <xref target="contentencryption-element"></xref></ td> <td align="left">RFC 9559, <xref target="contentencryption-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x535F</td> <td align="right">0x535F</td>
<td align="left">CueRefNumber</td> <td align="left">CueRefNumber</td>
<td align="left">Reclaimed (<xref target="cuerefnumber-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="cuerefnumber-element"></xref >)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x536E</td> <td align="right">0x536E</td>
<td align="left">Name</td> <td align="left">Name</td>
<td align="left">Described in <xref target="name-element"></xref></td> <td align="left">RFC 9559, <xref target="name-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x5378</td> <td align="right">0x5378</td>
<td align="left">CueBlockNumber</td> <td align="left">CueBlockNumber</td>
<td align="left">Described in <xref target="cueblocknumber-element"></xref></td> <td align="left">RFC 9559, <xref target="cueblocknumber-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x537F</td> <td align="right">0x537F</td>
<td align="left">TrackOffset</td> <td align="left">TrackOffset</td>
<td align="left">Reclaimed (<xref target="trackoffset-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="trackoffset-element"></xref> )</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x53AB</td> <td align="right">0x53AB</td>
<td align="left">SeekID</td> <td align="left">SeekID</td>
<td align="left">Described in <xref target="seekid-element"></xref></td> <td align="left">RFC 9559, <xref target="seekid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x53AC</td> <td align="right">0x53AC</td>
<td align="left">SeekPosition</td> <td align="left">SeekPosition</td>
<td align="left">Described in <xref target="seekposition-element"></xref></td> <td align="left">RFC 9559, <xref target="seekposition-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x53B8</td> <td align="right">0x53B8</td>
<td align="left">StereoMode</td> <td align="left">StereoMode</td>
<td align="left">Described in <xref target="stereomode-element"></xref></td> <td align="left">RFC 9559, <xref target="stereomode-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x53B9</td> <td align="right">0x53B9</td>
<td align="left">OldStereoMode</td> <td align="left">OldStereoMode</td>
<td align="left">Described in <xref target="oldstereomode-element"></xref></td> <td align="left">RFC 9559, <xref target="oldstereomode-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x53C0</td> <td align="right">0x53C0</td>
<td align="left">AlphaMode</td> <td align="left">AlphaMode</td>
<td align="left">Described in <xref target="alphamode-element"></xref></td> <td align="left">RFC 9559, <xref target="alphamode-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54AA</td> <td align="right">0x54AA</td>
<td align="left">PixelCropBottom</td> <td align="left">PixelCropBottom</td>
<td align="left">Described in <xref target="pixelcropbottom-element"></xref></td > <td align="left">RFC 9559, <xref target="pixelcropbottom-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54B0</td> <td align="right">0x54B0</td>
<td align="left">DisplayWidth</td> <td align="left">DisplayWidth</td>
<td align="left">Described in <xref target="displaywidth-element"></xref></td> <td align="left">RFC 9559, <xref target="displaywidth-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54B2</td> <td align="right">0x54B2</td>
<td align="left">DisplayUnit</td> <td align="left">DisplayUnit</td>
<td align="left">Described in <xref target="displayunit-element"></xref></td> <td align="left">RFC 9559, <xref target="displayunit-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54B3</td> <td align="right">0x54B3</td>
<td align="left">AspectRatioType</td> <td align="left">AspectRatioType</td>
<td align="left">Reclaimed (<xref target="aspectratiotype-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="aspectratiotype-element"></x ref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54BA</td> <td align="right">0x54BA</td>
<td align="left">DisplayHeight</td> <td align="left">DisplayHeight</td>
<td align="left">Described in <xref target="displayheight-element"></xref></td> <td align="left">RFC 9559, <xref target="displayheight-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54BB</td> <td align="right">0x54BB</td>
<td align="left">PixelCropTop</td> <td align="left">PixelCropTop</td>
<td align="left">Described in <xref target="pixelcroptop-element"></xref></td> <td align="left">RFC 9559, <xref target="pixelcroptop-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54CC</td> <td align="right">0x54CC</td>
<td align="left">PixelCropLeft</td> <td align="left">PixelCropLeft</td>
<td align="left">Described in <xref target="pixelcropleft-element"></xref></td> <td align="left">RFC 9559, <xref target="pixelcropleft-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x54DD</td> <td align="right">0x54DD</td>
<td align="left">PixelCropRight</td> <td align="left">PixelCropRight</td>
<td align="left">Described in <xref target="pixelcropright-element"></xref></td> <td align="left">RFC 9559, <xref target="pixelcropright-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55AA</td> <td align="right">0x55AA</td>
<td align="left">FlagForced</td> <td align="left">FlagForced</td>
<td align="left">Described in <xref target="flagforced-element"></xref></td> <td align="left">RFC 9559, <xref target="flagforced-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55AB</td> <td align="right">0x55AB</td>
<td align="left">FlagHearingImpaired</td> <td align="left">FlagHearingImpaired</td>
<td align="left">Described in <xref target="flaghearingimpaired-element"></xref> </td> <td align="left">RFC 9559, <xref target="flaghearingimpaired-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0x55AC</td> <td align="right">0x55AC</td>
<td align="left">FlagVisualImpaired</td> <td align="left">FlagVisualImpaired</td>
<td align="left">Described in <xref target="flagvisualimpaired-element"></xref>< /td> <td align="left">RFC 9559, <xref target="flagvisualimpaired-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x55AD</td> <td align="right">0x55AD</td>
<td align="left">FlagTextDescriptions</td> <td align="left">FlagTextDescriptions</td>
<td align="left">Described in <xref target="flagtextdescriptions-element"></xref ></td> <td align="left">RFC 9559, <xref target="flagtextdescriptions-element"></xref></ td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55AE</td> <td align="right">0x55AE</td>
<td align="left">FlagOriginal</td> <td align="left">FlagOriginal</td>
<td align="left">Described in <xref target="flagoriginal-element"></xref></td> <td align="left">RFC 9559, <xref target="flagoriginal-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55AF</td> <td align="right">0x55AF</td>
<td align="left">FlagCommentary</td> <td align="left">FlagCommentary</td>
<td align="left">Described in <xref target="flagcommentary-element"></xref></td> <td align="left">RFC 9559, <xref target="flagcommentary-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B0</td> <td align="right">0x55B0</td>
<td align="left">Colour</td> <td align="left">Colour</td>
<td align="left">Described in <xref target="colour-element"></xref></td> <td align="left">RFC 9559, <xref target="colour-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B1</td> <td align="right">0x55B1</td>
<td align="left">MatrixCoefficients</td> <td align="left">MatrixCoefficients</td>
<td align="left">Described in <xref target="matrixcoefficients-element"></xref>< /td> <td align="left">RFC 9559, <xref target="matrixcoefficients-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x55B2</td> <td align="right">0x55B2</td>
<td align="left">BitsPerChannel</td> <td align="left">BitsPerChannel</td>
<td align="left">Described in <xref target="bitsperchannel-element"></xref></td> <td align="left">RFC 9559, <xref target="bitsperchannel-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B3</td> <td align="right">0x55B3</td>
<td align="left">ChromaSubsamplingHorz</td> <td align="left">ChromaSubsamplingHorz</td>
<td align="left">Described in <xref target="chromasubsamplinghorz-element"></xre f></td> <td align="left">RFC 9559, <xref target="chromasubsamplinghorz-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B4</td> <td align="right">0x55B4</td>
<td align="left">ChromaSubsamplingVert</td> <td align="left">ChromaSubsamplingVert</td>
<td align="left">Described in <xref target="chromasubsamplingvert-element"></xre f></td> <td align="left">RFC 9559, <xref target="chromasubsamplingvert-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B5</td> <td align="right">0x55B5</td>
<td align="left">CbSubsamplingHorz</td> <td align="left">CbSubsamplingHorz</td>
<td align="left">Described in <xref target="cbsubsamplinghorz-element"></xref></ td> <td align="left">RFC 9559, <xref target="cbsubsamplinghorz-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B6</td> <td align="right">0x55B6</td>
<td align="left">CbSubsamplingVert</td> <td align="left">CbSubsamplingVert</td>
<td align="left">Described in <xref target="cbsubsamplingvert-element"></xref></ td> <td align="left">RFC 9559, <xref target="cbsubsamplingvert-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B7</td> <td align="right">0x55B7</td>
<td align="left">ChromaSitingHorz</td> <td align="left">ChromaSitingHorz</td>
<td align="left">Described in <xref target="chromasitinghorz-element"></xref></t d> <td align="left">RFC 9559, <xref target="chromasitinghorz-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B8</td> <td align="right">0x55B8</td>
<td align="left">ChromaSitingVert</td> <td align="left">ChromaSitingVert</td>
<td align="left">Described in <xref target="chromasitingvert-element"></xref></t d> <td align="left">RFC 9559, <xref target="chromasitingvert-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55B9</td> <td align="right">0x55B9</td>
<td align="left">Range</td> <td align="left">Range</td>
<td align="left">Described in <xref target="range-element"></xref></td> <td align="left">RFC 9559, <xref target="range-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55BA</td> <td align="right">0x55BA</td>
<td align="left">TransferCharacteristics</td> <td align="left">TransferCharacteristics</td>
<td align="left">Described in <xref target="transfercharacteristics-element"></x ref></td> <td align="left">RFC 9559, <xref target="transfercharacteristics-element"></xref ></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55BB</td> <td align="right">0x55BB</td>
<td align="left">Primaries</td> <td align="left">Primaries</td>
<td align="left">Described in <xref target="primaries-element"></xref></td> <td align="left">RFC 9559, <xref target="primaries-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55BC</td> <td align="right">0x55BC</td>
<td align="left">MaxCLL</td> <td align="left">MaxCLL</td>
<td align="left">Described in <xref target="maxcll-element"></xref></td> <td align="left">RFC 9559, <xref target="maxcll-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55BD</td> <td align="right">0x55BD</td>
<td align="left">MaxFALL</td> <td align="left">MaxFALL</td>
<td align="left">Described in <xref target="maxfall-element"></xref></td> <td align="left">RFC 9559, <xref target="maxfall-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D0</td> <td align="right">0x55D0</td>
<td align="left">MasteringMetadata</td> <td align="left">MasteringMetadata</td>
<td align="left">Described in <xref target="masteringmetadata-element"></xref></ td> <td align="left">RFC 9559, <xref target="masteringmetadata-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D1</td> <td align="right">0x55D1</td>
<td align="left">PrimaryRChromaticityX</td> <td align="left">PrimaryRChromaticityX</td>
<td align="left">Described in <xref target="primaryrchromaticityx-element"></xre f></td> <td align="left">RFC 9559, <xref target="primaryrchromaticityx-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D2</td> <td align="right">0x55D2</td>
<td align="left">PrimaryRChromaticityY</td> <td align="left">PrimaryRChromaticityY</td>
<td align="left">Described in <xref target="primaryrchromaticityy-element"></xre f></td> <td align="left">RFC 9559, <xref target="primaryrchromaticityy-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D3</td> <td align="right">0x55D3</td>
<td align="left">PrimaryGChromaticityX</td> <td align="left">PrimaryGChromaticityX</td>
<td align="left">Described in <xref target="primarygchromaticityx-element"></xre f></td> <td align="left">RFC 9559, <xref target="primarygchromaticityx-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D4</td> <td align="right">0x55D4</td>
<td align="left">PrimaryGChromaticityY</td> <td align="left">PrimaryGChromaticityY</td>
<td align="left">Described in <xref target="primarygchromaticityy-element"></xre f></td> <td align="left">RFC 9559, <xref target="primarygchromaticityy-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D5</td> <td align="right">0x55D5</td>
<td align="left">PrimaryBChromaticityX</td> <td align="left">PrimaryBChromaticityX</td>
<td align="left">Described in <xref target="primarybchromaticityx-element"></xre f></td> <td align="left">RFC 9559, <xref target="primarybchromaticityx-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D6</td> <td align="right">0x55D6</td>
<td align="left">PrimaryBChromaticityY</td> <td align="left">PrimaryBChromaticityY</td>
<td align="left">Described in <xref target="primarybchromaticityy-element"></xre f></td> <td align="left">RFC 9559, <xref target="primarybchromaticityy-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D7</td> <td align="right">0x55D7</td>
<td align="left">WhitePointChromaticityX</td> <td align="left">WhitePointChromaticityX</td>
<td align="left">Described in <xref target="whitepointchromaticityx-element"></x ref></td> <td align="left">RFC 9559, <xref target="whitepointchromaticityx-element"></xref ></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D8</td> <td align="right">0x55D8</td>
<td align="left">WhitePointChromaticityY</td> <td align="left">WhitePointChromaticityY</td>
<td align="left">Described in <xref target="whitepointchromaticityy-element"></x ref></td> <td align="left">RFC 9559, <xref target="whitepointchromaticityy-element"></xref ></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55D9</td> <td align="right">0x55D9</td>
<td align="left">LuminanceMax</td> <td align="left">LuminanceMax</td>
<td align="left">Described in <xref target="luminancemax-element"></xref></td> <td align="left">RFC 9559, <xref target="luminancemax-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55DA</td> <td align="right">0x55DA</td>
<td align="left">LuminanceMin</td> <td align="left">LuminanceMin</td>
<td align="left">Described in <xref target="luminancemin-element"></xref></td> <td align="left">RFC 9559, <xref target="luminancemin-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x55EE</td> <td align="right">0x55EE</td>
<td align="left">MaxBlockAdditionID</td> <td align="left">MaxBlockAdditionID</td>
<td align="left">Described in <xref target="maxblockadditionid-element"></xref>< /td> <td align="left">RFC 9559, <xref target="maxblockadditionid-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x5654</td> <td align="right">0x5654</td>
<td align="left">ChapterStringUID</td> <td align="left">ChapterStringUID</td>
<td align="left">Described in <xref target="chapterstringuid-element"></xref></t d> <td align="left">RFC 9559, <xref target="chapterstringuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x56AA</td> <td align="right">0x56AA</td>
<td align="left">CodecDelay</td> <td align="left">CodecDelay</td>
<td align="left">Described in <xref target="codecdelay-element"></xref></td> <td align="left">RFC 9559, <xref target="codecdelay-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x56BB</td> <td align="right">0x56BB</td>
<td align="left">SeekPreRoll</td> <td align="left">SeekPreRoll</td>
<td align="left">Described in <xref target="seekpreroll-element"></xref></td> <td align="left">RFC 9559, <xref target="seekpreroll-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x5741</td> <td align="right">0x5741</td>
<td align="left">WritingApp</td> <td align="left">WritingApp</td>
<td align="left">Described in <xref target="writingapp-element"></xref></td> <td align="left">RFC 9559, <xref target="writingapp-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x5854</td> <td align="right">0x5854</td>
<td align="left">SilentTracks</td> <td align="left">SilentTracks</td>
<td align="left">Reclaimed (<xref target="silenttracks-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="silenttracks-element"></xref >)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x58D7</td> <td align="right">0x58D7</td>
<td align="left">SilentTrackNumber</td> <td align="left">SilentTrackNumber</td>
<td align="left">Reclaimed (<xref target="silenttracknumber-element"></xref>)</t d> <td align="left">Reclaimed (RFC 9559, <xref target="silenttracknumber-element">< /xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x61A7</td> <td align="right">0x61A7</td>
<td align="left">AttachedFile</td> <td align="left">AttachedFile</td>
<td align="left">Described in <xref target="attachedfile-element"></xref></td> <td align="left">RFC 9559, <xref target="attachedfile-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6240</td> <td align="right">0x6240</td>
<td align="left">ContentEncoding</td> <td align="left">ContentEncoding</td>
<td align="left">Described in <xref target="contentencoding-element"></xref></td > <td align="left">RFC 9559, <xref target="contentencoding-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6264</td> <td align="right">0x6264</td>
<td align="left">BitDepth</td> <td align="left">BitDepth</td>
<td align="left">Described in <xref target="bitdepth-element"></xref></td> <td align="left">RFC 9559, <xref target="bitdepth-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63A2</td> <td align="right">0x63A2</td>
<td align="left">CodecPrivate</td> <td align="left">CodecPrivate</td>
<td align="left">Described in <xref target="codecprivate-element"></xref></td> <td align="left">RFC 9559, <xref target="codecprivate-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63C0</td> <td align="right">0x63C0</td>
<td align="left">Targets</td> <td align="left">Targets</td>
<td align="left">Described in <xref target="targets-element"></xref></td> <td align="left">RFC 9559, <xref target="targets-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63C3</td> <td align="right">0x63C3</td>
<td align="left">ChapterPhysicalEquiv</td> <td align="left">ChapterPhysicalEquiv</td>
<td align="left">Described in <xref target="chapterphysicalequiv-element"></xref ></td> <td align="left">RFC 9559, <xref target="chapterphysicalequiv-element"></xref></ td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63C4</td> <td align="right">0x63C4</td>
<td align="left">TagChapterUID</td> <td align="left">TagChapterUID</td>
<td align="left">Described in <xref target="tagchapteruid-element"></xref></td> <td align="left">RFC 9559, <xref target="tagchapteruid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63C5</td> <td align="right">0x63C5</td>
<td align="left">TagTrackUID</td> <td align="left">TagTrackUID</td>
<td align="left">Described in <xref target="tagtrackuid-element"></xref></td> <td align="left">RFC 9559, <xref target="tagtrackuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63C6</td> <td align="right">0x63C6</td>
<td align="left">TagAttachmentUID</td> <td align="left">TagAttachmentUID</td>
<td align="left">Described in <xref target="tagattachmentuid-element"></xref></t d> <td align="left">RFC 9559, <xref target="tagattachmentuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63C9</td> <td align="right">0x63C9</td>
<td align="left">TagEditionUID</td> <td align="left">TagEditionUID</td>
<td align="left">Described in <xref target="tageditionuid-element"></xref></td> <td align="left">RFC 9559, <xref target="tageditionuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x63CA</td> <td align="right">0x63CA</td>
<td align="left">TargetType</td> <td align="left">TargetType</td>
<td align="left">Described in <xref target="targettype-element"></xref></td> <td align="left">RFC 9559, <xref target="targettype-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6624</td> <td align="right">0x6624</td>
<td align="left">TrackTranslate</td> <td align="left">TrackTranslate</td>
<td align="left">Described in <xref target="tracktranslate-element"></xref></td> <td align="left">RFC 9559, <xref target="tracktranslate-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x66A5</td> <td align="right">0x66A5</td>
<td align="left">TrackTranslateTrackID</td> <td align="left">TrackTranslateTrackID</td>
<td align="left">Described in <xref target="tracktranslatetrackid-element"></xre f></td> <td align="left">RFC 9559, <xref target="tracktranslatetrackid-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x66BF</td> <td align="right">0x66BF</td>
<td align="left">TrackTranslateCodec</td> <td align="left">TrackTranslateCodec</td>
<td align="left">Described in <xref target="tracktranslatecodec-element"></xref> </td> <td align="left">RFC 9559, <xref target="tracktranslatecodec-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0x66FC</td> <td align="right">0x66FC</td>
<td align="left">TrackTranslateEditionUID</td> <td align="left">TrackTranslateEditionUID</td>
<td align="left">Described in <xref target="tracktranslateeditionuid-element"></ xref></td> <td align="left">RFC 9559, <xref target="tracktranslateeditionuid-element"></xre f></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x67C8</td> <td align="right">0x67C8</td>
<td align="left">SimpleTag</td> <td align="left">SimpleTag</td>
<td align="left">Described in <xref target="simpletag-element"></xref></td> <td align="left">RFC 9559, <xref target="simpletag-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x68CA</td> <td align="right">0x68CA</td>
<td align="left">TargetTypeValue</td> <td align="left">TargetTypeValue</td>
<td align="left">Described in <xref target="targettypevalue-element"></xref></td > <td align="left">RFC 9559, <xref target="targettypevalue-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6911</td> <td align="right">0x6911</td>
<td align="left">ChapProcessCommand</td> <td align="left">ChapProcessCommand</td>
<td align="left">Described in <xref target="chapprocesscommand-element"></xref>< /td> <td align="left">RFC 9559, <xref target="chapprocesscommand-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x6922</td> <td align="right">0x6922</td>
<td align="left">ChapProcessTime</td> <td align="left">ChapProcessTime</td>
<td align="left">Described in <xref target="chapprocesstime-element"></xref></td > <td align="left">RFC 9559, <xref target="chapprocesstime-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6924</td> <td align="right">0x6924</td>
<td align="left">ChapterTranslate</td> <td align="left">ChapterTranslate</td>
<td align="left">Described in <xref target="chaptertranslate-element"></xref></t d> <td align="left">RFC 9559, <xref target="chaptertranslate-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6933</td> <td align="right">0x6933</td>
<td align="left">ChapProcessData</td> <td align="left">ChapProcessData</td>
<td align="left">Described in <xref target="chapprocessdata-element"></xref></td > <td align="left">RFC 9559, <xref target="chapprocessdata-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6944</td> <td align="right">0x6944</td>
<td align="left">ChapProcess</td> <td align="left">ChapProcess</td>
<td align="left">Described in <xref target="chapprocess-element"></xref></td> <td align="left">RFC 9559, <xref target="chapprocess-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6955</td> <td align="right">0x6955</td>
<td align="left">ChapProcessCodecID</td> <td align="left">ChapProcessCodecID</td>
<td align="left">Described in <xref target="chapprocesscodecid-element"></xref>< /td> <td align="left">RFC 9559, <xref target="chapprocesscodecid-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x69A5</td> <td align="right">0x69A5</td>
<td align="left">ChapterTranslateID</td> <td align="left">ChapterTranslateID</td>
<td align="left">Described in <xref target="chaptertranslateid-element"></xref>< /td> <td align="left">RFC 9559, <xref target="chaptertranslateid-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x69BF</td> <td align="right">0x69BF</td>
<td align="left">ChapterTranslateCodec</td> <td align="left">ChapterTranslateCodec</td>
<td align="left">Described in <xref target="chaptertranslatecodec-element"></xre f></td> <td align="left">RFC 9559, <xref target="chaptertranslatecodec-element"></xref>< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x69FC</td> <td align="right">0x69FC</td>
<td align="left">ChapterTranslateEditionUID</td> <td align="left">ChapterTranslateEditionUID</td>
<td align="left">Described in <xref target="chaptertranslateeditionuid-element"> </xref></td> <td align="left">RFC 9559, <xref target="chaptertranslateeditionuid-element"></x ref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6D80</td> <td align="right">0x6D80</td>
<td align="left">ContentEncodings</td> <td align="left">ContentEncodings</td>
<td align="left">Described in <xref target="contentencodings-element"></xref></t d> <td align="left">RFC 9559, <xref target="contentencodings-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6DE7</td> <td align="right">0x6DE7</td>
<td align="left">MinCache</td> <td align="left">MinCache</td>
<td align="left">Reclaimed (<xref target="mincache-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="mincache-element"></xref>)</ td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6DF8</td> <td align="right">0x6DF8</td>
<td align="left">MaxCache</td> <td align="left">MaxCache</td>
<td align="left">Reclaimed (<xref target="maxcache-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="maxcache-element"></xref>)</ td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6E67</td> <td align="right">0x6E67</td>
<td align="left">ChapterSegmentUUID</td> <td align="left">ChapterSegmentUUID</td>
<td align="left">Described in <xref target="chaptersegmentuuid-element"></xref>< /td> <td align="left">RFC 9559, <xref target="chaptersegmentuuid-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x6EBC</td> <td align="right">0x6EBC</td>
<td align="left">ChapterSegmentEditionUID</td> <td align="left">ChapterSegmentEditionUID</td>
<td align="left">Described in <xref target="chaptersegmenteditionuid-element"></ xref></td> <td align="left">RFC 9559, <xref target="chaptersegmenteditionuid-element"></xre f></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x6FAB</td> <td align="right">0x6FAB</td>
<td align="left">TrackOverlay</td> <td align="left">TrackOverlay</td>
<td align="left">Reclaimed (<xref target="trackoverlay-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="trackoverlay-element"></xref >)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7373</td> <td align="right">0x7373</td>
<td align="left">Tag</td> <td align="left">Tag</td>
<td align="left">Described in <xref target="tag-element"></xref></td> <td align="left">RFC 9559, <xref target="tag-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7384</td> <td align="right">0x7384</td>
<td align="left">SegmentFilename</td> <td align="left">SegmentFilename</td>
<td align="left">Described in <xref target="segmentfilename-element"></xref></td > <td align="left">RFC 9559, <xref target="segmentfilename-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x73A4</td> <td align="right">0x73A4</td>
<td align="left">SegmentUUID</td> <td align="left">SegmentUUID</td>
<td align="left">Described in <xref target="segmentuuid-element"></xref></td> <td align="left">RFC 9559, <xref target="segmentuuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x73C4</td> <td align="right">0x73C4</td>
<td align="left">ChapterUID</td> <td align="left">ChapterUID</td>
<td align="left">Described in <xref target="chapteruid-element"></xref></td> <td align="left">RFC 9559, <xref target="chapteruid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x73C5</td> <td align="right">0x73C5</td>
<td align="left">TrackUID</td> <td align="left">TrackUID</td>
<td align="left">Described in <xref target="trackuid-element"></xref></td> <td align="left">RFC 9559, <xref target="trackuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7446</td> <td align="right">0x7446</td>
<td align="left">AttachmentLink</td> <td align="left">AttachmentLink</td>
<td align="left">Described in <xref target="attachmentlink-element"></xref></td> <td align="left">RFC 9559, <xref target="attachmentlink-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x75A1</td> <td align="right">0x75A1</td>
<td align="left">BlockAdditions</td> <td align="left">BlockAdditions</td>
<td align="left">Described in <xref target="blockadditions-element"></xref></td> <td align="left">RFC 9559, <xref target="blockadditions-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x75A2</td> <td align="right">0x75A2</td>
<td align="left">DiscardPadding</td> <td align="left">DiscardPadding</td>
<td align="left">Described in <xref target="discardpadding-element"></xref></td> <td align="left">RFC 9559, <xref target="discardpadding-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7670</td> <td align="right">0x7670</td>
<td align="left">Projection</td> <td align="left">Projection</td>
<td align="left">Described in <xref target="projection-element"></xref></td> <td align="left">RFC 9559, <xref target="projection-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7671</td> <td align="right">0x7671</td>
<td align="left">ProjectionType</td> <td align="left">ProjectionType</td>
<td align="left">Described in <xref target="projectiontype-element"></xref></td> <td align="left">RFC 9559, <xref target="projectiontype-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7672</td> <td align="right">0x7672</td>
<td align="left">ProjectionPrivate</td> <td align="left">ProjectionPrivate</td>
<td align="left">Described in <xref target="projectionprivate-element"></xref></ td> <td align="left">RFC 9559, <xref target="projectionprivate-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7673</td> <td align="right">0x7673</td>
<td align="left">ProjectionPoseYaw</td> <td align="left">ProjectionPoseYaw</td>
<td align="left">Described in <xref target="projectionposeyaw-element"></xref></ td> <td align="left">RFC 9559, <xref target="projectionposeyaw-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7674</td> <td align="right">0x7674</td>
<td align="left">ProjectionPosePitch</td> <td align="left">ProjectionPosePitch</td>
<td align="left">Described in <xref target="projectionposepitch-element"></xref> </td> <td align="left">RFC 9559, <xref target="projectionposepitch-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0x7675</td> <td align="right">0x7675</td>
<td align="left">ProjectionPoseRoll</td> <td align="left">ProjectionPoseRoll</td>
<td align="left">Described in <xref target="projectionposeroll-element"></xref>< /td> <td align="left">RFC 9559, <xref target="projectionposeroll-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x78B5</td> <td align="right">0x78B5</td>
<td align="left">OutputSamplingFrequency</td> <td align="left">OutputSamplingFrequency</td>
<td align="left">Described in <xref target="outputsamplingfrequency-element"></x ref></td> <td align="left">RFC 9559, <xref target="outputsamplingfrequency-element"></xref ></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7BA9</td> <td align="right">0x7BA9</td>
<td align="left">Title</td> <td align="left">Title</td>
<td align="left">Described in <xref target="title-element"></xref></td> <td align="left">RFC 9559, <xref target="title-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x7D7B</td> <td align="right">0x7D7B</td>
<td align="left">ChannelPositions</td> <td align="left">ChannelPositions</td>
<td align="left">Reclaimed (<xref target="channelpositions-element"></xref>)</td > <td align="left">Reclaimed (RFC 9559, <xref target="channelpositions-element"></ xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x22B59C</td> <td align="right">0x22B59C</td>
<td align="left">Language</td> <td align="left">Language</td>
<td align="left">Described in <xref target="language-element"></xref></td> <td align="left">RFC 9559, <xref target="language-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x22B59D</td> <td align="right">0x22B59D</td>
<td align="left">LanguageBCP47</td> <td align="left">LanguageBCP47</td>
<td align="left">Described in <xref target="languagebcp47-element"></xref></td> <td align="left">RFC 9559, <xref target="languagebcp47-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x23314F</td> <td align="right">0x23314F</td>
<td align="left">TrackTimestampScale</td> <td align="left">TrackTimestampScale</td>
<td align="left">Described in <xref target="tracktimestampscale-element"></xref> </td> <td align="left">RFC 9559, <xref target="tracktimestampscale-element"></xref></t d>
</tr> </tr>
<tr> <tr>
<td align="right">0x234E7A</td> <td align="right">0x234E7A</td>
<td align="left">DefaultDecodedFieldDuration</td> <td align="left">DefaultDecodedFieldDuration</td>
<td align="left">Described in <xref target="defaultdecodedfieldduration-element" ></xref></td> <td align="left">RFC 9559, <xref target="defaultdecodedfieldduration-element"></ xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x2383E3</td> <td align="right">0x2383E3</td>
<td align="left">FrameRate</td> <td align="left">FrameRate</td>
<td align="left">Reclaimed (<xref target="framerate-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="framerate-element"></xref>)< /td>
</tr> </tr>
<tr> <tr>
<td align="right">0x23E383</td> <td align="right">0x23E383</td>
<td align="left">DefaultDuration</td> <td align="left">DefaultDuration</td>
<td align="left">Described in <xref target="defaultduration-element"></xref></td > <td align="left">RFC 9559, <xref target="defaultduration-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x258688</td> <td align="right">0x258688</td>
<td align="left">CodecName</td> <td align="left">CodecName</td>
<td align="left">Described in <xref target="codecname-element"></xref></td> <td align="left">RFC 9559, <xref target="codecname-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x26B240</td> <td align="right">0x26B240</td>
<td align="left">CodecDownloadURL</td> <td align="left">CodecDownloadURL</td>
<td align="left">Reclaimed (<xref target="codecdownloadurl-element"></xref>)</td > <td align="left">Reclaimed (RFC 9559, <xref target="codecdownloadurl-element"></ xref>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x2AD7B1</td> <td align="right">0x2AD7B1</td>
<td align="left">TimestampScale</td> <td align="left">TimestampScale</td>
<td align="left">Described in <xref target="timestampscale-element"></xref></td> <td align="left">RFC 9559, <xref target="timestampscale-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x2EB524</td> <td align="right">0x2EB524</td>
<td align="left">UncompressedFourCC</td> <td align="left">UncompressedFourCC</td>
<td align="left">Described in <xref target="uncompressedfourcc-element"></xref>< /td> <td align="left">RFC 9559, <xref target="uncompressedfourcc-element"></xref></td >
</tr> </tr>
<tr> <tr>
<td align="right">0x2FB523</td> <td align="right">0x2FB523</td>
<td align="left">GammaValue</td> <td align="left">GammaValue</td>
<td align="left">Reclaimed (<xref target="gammavalue-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="gammavalue-element"></xref>) </td>
</tr> </tr>
<tr> <tr>
<td align="right">0x3A9697</td> <td align="right">0x3A9697</td>
<td align="left">CodecSettings</td> <td align="left">CodecSettings</td>
<td align="left">Reclaimed (<xref target="codecsettings-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="codecsettings-element"></xre f>)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x3B4040</td> <td align="right">0x3B4040</td>
<td align="left">CodecInfoURL</td> <td align="left">CodecInfoURL</td>
<td align="left">Reclaimed (<xref target="codecinfourl-element"></xref>)</td> <td align="left">Reclaimed (RFC 9559, <xref target="codecinfourl-element"></xref >)</td>
</tr> </tr>
<tr> <tr>
<td align="right">0x3C83AB</td> <td align="right">0x3C83AB</td>
<td align="left">PrevFilename</td> <td align="left">PrevFilename</td>
<td align="left">Described in <xref target="prevfilename-element"></xref></td> <td align="left">RFC 9559, <xref target="prevfilename-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x3CB923</td> <td align="right">0x3CB923</td>
<td align="left">PrevUUID</td> <td align="left">PrevUUID</td>
<td align="left">Described in <xref target="prevuuid-element"></xref></td> <td align="left">RFC 9559, <xref target="prevuuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x3E83BB</td> <td align="right">0x3E83BB</td>
<td align="left">NextFilename</td> <td align="left">NextFilename</td>
<td align="left">Described in <xref target="nextfilename-element"></xref></td> <td align="left">RFC 9559, <xref target="nextfilename-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x3EB923</td> <td align="right">0x3EB923</td>
<td align="left">NextUUID</td> <td align="left">NextUUID</td>
<td align="left">Described in <xref target="nextuuid-element"></xref></td> <td align="left">RFC 9559, <xref target="nextuuid-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x1043A770</td> <td align="right">0x1043A770</td>
<td align="left">Chapters</td> <td align="left">Chapters</td>
<td align="left">Described in <xref target="chapters-element"></xref></td> <td align="left">RFC 9559, <xref target="chapters-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x114D9B74</td> <td align="right">0x114D9B74</td>
<td align="left">SeekHead</td> <td align="left">SeekHead</td>
<td align="left">Described in <xref target="seekhead-element"></xref></td> <td align="left">RFC 9559, <xref target="seekhead-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x1254C367</td> <td align="right">0x1254C367</td>
<td align="left">Tags</td> <td align="left">Tags</td>
<td align="left">Described in <xref target="tags-element"></xref></td> <td align="left">RFC 9559, <xref target="tags-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x1549A966</td> <td align="right">0x1549A966</td>
<td align="left">Info</td> <td align="left">Info</td>
<td align="left">Described in <xref target="info-element"></xref></td> <td align="left">RFC 9559, <xref target="info-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x1654AE6B</td> <td align="right">0x1654AE6B</td>
<td align="left">Tracks</td> <td align="left">Tracks</td>
<td align="left">Described in <xref target="tracks-element"></xref></td> <td align="left">RFC 9559, <xref target="tracks-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x18538067</td> <td align="right">0x18538067</td>
<td align="left">Segment</td> <td align="left">Segment</td>
<td align="left">Described in <xref target="segment-element"></xref></td> <td align="left">RFC 9559, <xref target="segment-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x1941A469</td> <td align="right">0x1941A469</td>
<td align="left">Attachments</td> <td align="left">Attachments</td>
<td align="left">Described in <xref target="attachments-element"></xref></td> <td align="left">RFC 9559, <xref target="attachments-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x1C53BB6B</td> <td align="right">0x1C53BB6B</td>
<td align="left">Cues</td> <td align="left">Cues</td>
<td align="left">Described in <xref target="cues-element"></xref></td> <td align="left">RFC 9559, <xref target="cues-element"></xref></td>
</tr> </tr>
<tr> <tr>
<td align="right">0x1F43B675</td> <td align="right">0x1F43B675</td>
<td align="left">Cluster</td> <td align="left">Cluster</td>
<td align="left">Described in <xref target="cluster-element"></xref></td> <td align="left">RFC 9559, <xref target="cluster-element"></xref></td>
</tr> </tr>
</tbody> </tbody>
</table></section> </table></section>
<section anchor="chapter-codec-ids-registry"><name>Chapter Codec IDs Registry</n ame> <section anchor="chapter-codec-ids-registry"><name>Chapter Codec IDs Registry</n ame>
<t>This document creates a new IANA registry called the &quot;Matroska Chapter C odec IDs&quot; registry. <t>IANA has created a new registry called the "Matroska Chapter Codec IDs" regis try.
The values correspond to the unsigned integer <tt>ChapProcessCodecID</tt> value described in <xref target="chapprocesscodecid-element"></xref>.</t> The values correspond to the unsigned integer <tt>ChapProcessCodecID</tt> value described in <xref target="chapprocesscodecid-element"></xref>.</t>
<t>To register a new Chapter Codec ID in this registry, one needs a Chapter Code c ID, <t>To register a new Chapter Codec ID in this registry, one needs a Chapter Code c ID,
a Change Controller (IETF or email of registrant) and a Change Controller (IETF or email of registrant), and
an optional Reference to a document describing the Chapter Codec ID.</t> an optional Reference to a document describing the Chapter Codec ID.</t>
<t>The Chapter Codec IDs are to be allocated according to the &quot;First Come F <t>The Chapter Codec IDs are to be allocated according to the "First Come First
irst Served&quot; policy <xref target="RFC8126"></xref>.</t> Served" policy <xref target="RFC8126"></xref>.</t>
<t><tt>ChapProcessCodecID</tt> values of &quot;0&quot; and &quot;1&quot; are RES <t>Values of "0" and "1" are reserved for future use (with the IETF as the Chang
ERVED to the IETF for future use.</t> e Controller).</t>
</section> </section>
<section anchor="media-types"><name>Media Types</name> <section anchor="media-types"><name>Media Types</name>
<t>Matroska files and streams are found in three main forms: audio-video files,
audio-only and occasionally with stereoscopic video tracks.</t>
<t>Historically Matroska files and streams have used the following media types w
ith a &quot;x-&quot; prefix.
For better compatibility a system <bcp14>SHOULD</bcp14> be able to handle both f
ormats.
Newer systems <bcp14>SHOULD NOT</bcp14> use the historic format and use the form
at that follows the <xref target="RFC6838"></xref> format instead.</t>
<t>Please register three media types, the <xref target="RFC6838"></xref> templat
es are below:</t>
<section anchor="for-files-containing-video-tracks"><name>For files containing v <!-- [rfced] Please review the text after the ":" and let us know how to
ideo tracks</name> update for clarity. Are the words "files" and "tracks" needed?
<dl spacing="compact"> Original:
Matroska files and streams are found in three main forms: audio-video
files, audio-only and occasionally with stereoscopic video tracks.
Perhaps:
Matroska files and streams are found in three main forms: audio-video,
audio-only, and (occasionally) stereoscopic video.
-->
<t>Matroska files and streams are found in three main forms: audio-video files,
audio-only, and occasionally with stereoscopic video tracks.</t>
<t>Historically, Matroska files and streams have used the following media types
with an "x-" prefix.
For better compatibility, a system <bcp14>SHOULD</bcp14> be able to handle both
formats.
Newer systems <bcp14>SHOULD NOT</bcp14> use the historic format and use the form
at that follows the format in <xref target="RFC6838"></xref> instead.</t>
<t>IANA has registered three media types per the templates (see <xref target="RF
C6838"></xref>) in the following subsections.</t>
<section anchor="for-files-containing-video-tracks"><name>For Files Containing V
ideo Tracks</name>
<dl>
<dt>Type name:</dt> <dt>Type name:</dt>
<dd>video</dd> <dd>video</dd>
<dt>Subtype name:</dt> <dt>Subtype name:</dt>
<dd>matroska</dd> <dd>matroska</dd>
<dt>Required parameters:</dt> <dt>Required parameters:</dt>
<dd>N/A</dd> <dd>N/A</dd>
<dt>Optional parameters:</dt> <dt>Optional parameters:</dt>
<dd>N/A</dd> <dd>N/A</dd>
<dt>Encoding considerations:</dt> <dt>Encoding considerations:</dt>
<dd>as per this document and RFC8794</dd> <dd>As per RFCs 9559 and 8794</dd>
<dt>Security considerations:</dt> <dt>Security considerations:</dt>
<dd>See <xref target="security-considerations"></xref>.</dd> <dd>See <xref target="security-considerations"></xref> of RFC 9559.</dd>
<dt>Interoperability considerations:</dt> <dt>Interoperability considerations:</dt>
<dd>Due to the extensibility of Matroska, it is possible to encounter files with unknown but valid EBML Elements. Readers should be ready to handle this case. T he fixed byte order, octet boundaries and UTF-8 usage allow for broad interopara bility.</dd> <dd>Due to the extensibility of Matroska, it is possible to encounter files with unknown but valid EBML Elements. Readers should be ready to handle this case. T he fixed byte order, octet boundaries, and UTF-8 usage allow for broad interoper ability.</dd>
<dt>Published specification:</dt> <dt>Published specification:</dt>
<dd>THISRFC</dd> <dd>RFC 9559</dd>
<dt>Applications that use this media type:</dt> <dt>Applications that use this media type:</dt>
<dd>FFmpeg, VLC, ...</dd> <dd>FFmpeg, VLC, ...</dd>
<dt>Fragment identifier considerations:</dt> <dt>Fragment identifier considerations:</dt>
<dd>N/A</dd> <dd>N/A</dd>
</dl> <dt>Additional information:</dt><dd>
<t>Additional information:</t> <t><br/></t>
<ul>
<li><t>Deprecated alias names for this type: video/x-matroska</t>
</li>
<li><t>Magic number(s): N/A</t>
</li>
<li><t>File extension(s): mkv</t>
</li>
<li><t>Macintosh file type code(s): N/A</t>
</li>
</ul>
<dl spacing="compact"> <dl spacing="compact">
<dt>Deprecated alias names for this type:</dt><dd>video/x-matroska</dd>
<dt>Magic number(s):</dt><dd>N/A</dd>
<dt>File extension(s):</dt><dd>mkv</dd>
<dt>Macintosh file type code(s):</dt><dd>N/A</dd>
</dl></dd>
<dt>Person &amp; email address to contact for further information:</dt> <dt>Person &amp; email address to contact for further information:</dt>
<dd>IETF CELLAR WG cellar@ietf.org</dd> <dd>IETF CELLAR WG (cellar@ietf.org)</dd>
<dt>Intended usage:</dt> <dt>Intended usage:</dt>
<dd>COMMON</dd> <dd>COMMON</dd>
<dt>Restrictions on usage:</dt> <dt>Restrictions on usage:</dt>
<dd>None</dd> <dd>None</dd>
<dt>Author:</dt> <dt>Author:</dt>
<dd>IETF CELLAR WG</dd> <dd>IETF CELLAR WG</dd>
<dt>Change controller:</dt> <dt>Change controller:</dt>
<dd>IETF</dd> <dd>IETF</dd>
<dt>Provisional registration? (standards tree only):</dt>
<dd>No</dd>
</dl> </dl>
</section> </section>
<section anchor="for-files-containing-audio-tracks-with-no-video-tracks"><name>F or files containing audio tracks with no video tracks</name> <section anchor="for-files-containing-audio-tracks-with-no-video-tracks"><name>F or Files Containing Audio Tracks with No Video Tracks</name>
<dl spacing="compact"> <dl>
<dt>Type name:</dt> <dt>Type name:</dt>
<dd>audio</dd> <dd>audio</dd>
<dt>Subtype name:</dt> <dt>Subtype name:</dt>
<dd>matroska</dd> <dd>matroska</dd>
<dt>Required parameters:</dt> <dt>Required parameters:</dt>
<dd>N/A</dd> <dd>N/A</dd>
<dt>Optional parameters:</dt> <dt>Optional parameters:</dt>
<dd>N/A</dd> <dd>N/A</dd>
<dt>Encoding considerations:</dt> <dt>Encoding considerations:</dt>
<dd>as per this document and RFC8794</dd> <dd>As per RFCs 9559 and 8794</dd>
<dt>Security considerations:</dt> <dt>Security considerations:</dt>
<dd>See <xref target="security-considerations"></xref>.</dd> <dd>See <xref target="security-considerations"></xref> of RFC 9559.</dd>
<dt>Interoperability considerations:</dt> <dt>Interoperability considerations:</dt>
<dd>Due to the extensibility of Matroska, it is possible to encounter files with unknown but valid EBML Elements. Readers should be ready to handle this case. T he fixed byte order, octet boundaries and UTF-8 usage allow for broad interopara bility.</dd> <dd>Due to the extensibility of Matroska, it is possible to encounter files with unknown but valid EBML Elements. Readers should be ready to handle this case. T he fixed byte order, octet boundaries, and UTF-8 usage allow for broad interoper ability.</dd>
<dt>Published specification:</dt> <dt>Published specification:</dt>
<dd>THISRFC</dd> <dd>RFC 9559</dd>
<dt>Applications that use this media type:</dt> <dt>Applications that use this media type:</dt>
<dd>FFmpeg, VLC, ...</dd> <dd>FFmpeg, VLC, ...</dd>
<dt>Fragment identifier considerations:</dt> <dt>Fragment identifier considerations:</dt>
<dd>N/A</dd> <dd>N/A</dd>
</dl> <dt>Additional information:</dt><dd>
<t>Additional information:</t> <t><br/></t>
<ul>
<li><t>Deprecated alias names for this type: audio/x-matroska</t>
</li>
<li><t>Magic number(s): N/A</t>
</li>
<li><t>File extension(s): mka</t>
</li>
<li><t>Macintosh file type code(s): N/A</t>
</li>
</ul>
<dl spacing="compact"> <dl spacing="compact">
<dt>Deprecated alias names for this type:</dt><dd>audio/x-matroska</dd>
<dt>Magic number(s):</dt><dd>N/A</dd>
<dt>File extension(s):</dt><dd>mka</dd>
<dt>Macintosh file type code(s):</dt><dd>N/A</dd>
</dl>
</dd></dl>
<dl>
<dt>Person &amp; email address to contact for further information:</dt> <dt>Person &amp; email address to contact for further information:</dt>
<dd>IETF CELLAR WG cellar@ietf.org</dd> <dd>IETF CELLAR WG (cellar@ietf.org)</dd>
<dt>Intended usage:</dt> <dt>Intended usage:</dt>
<dd>COMMON</dd> <dd>COMMON</dd>
<dt>Restrictions on usage:</dt> <dt>Restrictions on usage:</dt>
<dd>None</dd> <dd>None</dd>
<dt>Author:</dt> <dt>Author:</dt>
<dd>IETF CELLAR WG</dd> <dd>IETF CELLAR WG</dd>
<dt>Change controller:</dt> <dt>Change controller:</dt>
<dd>IETF</dd> <dd>IETF</dd>
<dt>Provisional registration? (standards tree only):</dt>
<dd>No</dd>
</dl> </dl>
</section> </section>
<section anchor="for-files-containing-a-stereoscopic-video-track"><name>For file s containing a stereoscopic video track</name> <section anchor="for-files-containing-a-stereoscopic-video-track"><name>For File s Containing a Stereoscopic Video Track</name>
<dl spacing="compact"> <dl>
<dt>Type name:</dt> <dt>Type name:</dt>
<dd>video</dd> <dd>video</dd>
<dt>Subtype name:</dt> <dt>Subtype name:</dt>
<dd>matroska-3d</dd> <dd>matroska-3d</dd>
<dt>Required parameters:</dt> <dt>Required parameters:</dt>
<dd>N/A</dd> <dd>N/A</dd>
<dt>Optional parameters:</dt> <dt>Optional parameters:</dt>
<dd>N/A</dd> <dd>N/A</dd>
<dt>Encoding considerations:</dt> <dt>Encoding considerations:</dt>
<dd>as per this document and RFC8794</dd> <dd>As per RFCs 9559 and 8794 </dd>
<dt>Security considerations:</dt> <dt>Security considerations:</dt>
<dd>See <xref target="security-considerations"></xref>.</dd> <dd>See <xref target="security-considerations"></xref> of RFC 9559.</dd>
<dt>Interoperability considerations:</dt> <dt>Interoperability considerations:</dt>
<dd>Due to the extensibility of Matroska, it is possible to encounter files with unknown but valid EBML Elements. Readers should be ready to handle this case. T he fixed byte order, octet boundaries and UTF-8 usage allow for broad interopara bility.</dd> <dd>Due to the extensibility of Matroska, it is possible to encounter files with unknown but valid EBML Elements. Readers should be ready to handle this case. T he fixed byte order, octet boundaries, and UTF-8 usage allow for broad interoper ability.</dd>
<dt>Published specification:</dt> <dt>Published specification:</dt>
<dd>THISRFC</dd> <dd>RFC 9559</dd>
<dt>Applications that use this media type:</dt> <dt>Applications that use this media type:</dt>
<dd>FFmpeg, VLC, ...</dd> <dd>FFmpeg, VLC, ...</dd>
<dt>Fragment identifier considerations:</dt> <dt>Fragment identifier considerations:</dt>
<dd>N/A</dd> <dd>N/A</dd>
</dl> <dt>Additional information:</dt><dd>
<t>Additional information:</t> <t><br/></t>
<ul>
<li><t>Deprecated alias names for this type: video/x-matroska-3d</t>
</li>
<li><t>Magic number(s): N/A</t>
</li>
<li><t>File extension(s): mk3d</t>
</li>
<li><t>Macintosh file type code(s): N/A</t>
</li>
</ul>
<dl spacing="compact"> <dl spacing="compact">
<dt>Deprecated alias names for this type:</dt><dd>video/x-matroska-3d</dd>
<dt>Magic number(s):</dt><dd>N/A</dd>
<dt>File extension(s):</dt><dd>mk3d</dd>
<dt>Macintosh file type code(s):</dt><dd>N/A</dd>
</dl>
</dd></dl>
<dl>
<dt>Person &amp; email address to contact for further information:</dt> <dt>Person &amp; email address to contact for further information:</dt>
<dd>IETF CELLAR WG cellar@ietf.org</dd> <dd>IETF CELLAR WG (cellar@ietf.org)</dd>
<dt>Intended usage:</dt> <dt>Intended usage:</dt>
<dd>COMMON</dd> <dd>COMMON</dd>
<dt>Restrictions on usage:</dt> <dt>Restrictions on usage:</dt>
<dd>None</dd> <dd>None</dd>
<dt>Author:</dt> <dt>Author:</dt>
<dd>IETF CELLAR WG</dd> <dd>IETF CELLAR WG</dd>
<dt>Change controller:</dt> <dt>Change controller:</dt>
<dd>IETF</dd> <dd>IETF</dd>
<dt>Provisional registration? (standards tree only):</dt>
<dd>No</dd>
</dl> </dl>
</section> </section>
</section> </section>
</section> </section>
<section anchor="annex-a-historic-deprecated-elements"><name>Annex A: Historic D </middle>
eprecated Elements</name>
<t>As Matroska evolved since 2002 many parts that were considered for use in the <back>
format were never
used and often incorrectly designed. Many of the elements that were then defined <displayreference target="RFC5646" to="BCP47"/>
are not <displayreference target="I-D.ietf-cellar-codec" to="MatroskaCodec"/>
<displayreference target="I-D.ietf-cellar-tags" to="MatroskaTags"/>
<!-- [rfced] BCP 47 contains two RFCs: RFC 4647 and RFC 5646. See
https://www.rfc-editor.org/info/bcp47.
It seems that when "BCP 47" and "[BCP47]" are used, the intent is to refer to
RFC 5646. Is this correct?
If so, we recommend the following updates. Note that we will not make any
changes to element names (e.g., LanguageBCP47 and ChapLanguageBCP47).
a) Add the following sentence to the end of Section 12 to clarify that "BCP47"
in element names refers specifically to RFC 5646.
Perhaps:
In this document, "BCP47" in element names refers specifically to [RFC5646],
which is
part of BCP 47.
b) Update these sentences in Section 12 as follows to use RFC 5647 rather than B
CP 47
Original:
Starting in Matroska version 4, either [ISO639-2] or [BCP47] MAY be
used, although BCP 47 is RECOMMENDED. The BCP 47 Language Elements
are "LanguageBCP47 Element", "TagLanguageBCP47 Element", and
"ChapLanguageBCP47 Element". If a BCP 47 Language Element and an ISO
639-2 Language Element are used within the same Parent Element, then
the ISO 639-2 Language Element MUST be ignored and precedence given
to the BCP 47 Language Element.
Perhaps:
Starting in Matroska version 4, the forms defined
in either [ISO639-2] or [RFC5646] MAY be
used, although the form in [RFC5646] is RECOMMENDED. The Language Elements
in the [RFC5646] form are are "LanguageBCP47 Element", "TagLanguageBCP47 Elem
ent",
and "ChapLanguageBCP47 Element". If both an [ISO639-2] Language Element and
an [RFC5646] Language Element are used within the same Parent Element, then
the Language Element in the [ISO639-2] form MUST be ignored and precedence gi
ven
to the Language Element in the [RFC5646] form.
c) Update these sentences to use RFC 5647 rather than BCP 47
Original:
definition: The language of the track, in the [BCP47] form; see
Section 12 on language codes.
definition: A language corresponding to the ChapString, in the
[BCP47] form; see Section 12 on language codes.
definition: The language used in the TagString, in the [BCP47] form;
see Section 12 on language codes.
Country codes are the [BCP47] two-letter region subtag, without the
UK exception.
Perhaps:
definition: The language of the track, in the form defined in
[RFC5646]; see Section 12 on language codes.
definition: A language corresponding to the ChapString, in
the form defined in [RFC5646]; see Section 12 on language codes.
definition: The language used in the TagString, in
the form defined in [RFC5646]; see Section 12 on language codes.
Country codes are the two-letter region subtag defined in [RFC5646],
without the UK exception.
-->
<!-- [rfced] We see a few instances of "in the Matroska languages form" with a
pointer to Section 12, which discusses the [ISO639-2] or [BCP47]
forms. Please review and let us know if "in the Matroska languages form"
will be clear to readers or if updates are needed.
Original:
definition: The language of the track, in the Matroska languages
form; see Section 12 on language codes.
definition: A language corresponding to the string, in the Matroska
languages form; see Section 12 on language codes.
definition: Specifies the language of the tag specified, in the
Matroska languages form; see Section 12 on language codes.
-->
<!-- [rfced] References
a) FYI - For clarity, we added "[RFC8794]" after several instances of "the
EBML specification".
b) The original link provided for the following reference is a withdrawn
standard. We have updated the the date and URL to point to the current
version. Please let us know any concerns.
Original:
[ISO9899] International Organization for Standardization,
"Information technology - Programming languages - C",
ISO/IEC 9899:2011, 2011,
<https://www.iso.org/standard/57853.html>.
Current:
[ISO9899] International Organization for Standardization,
"Information technology - Programming languages - C",
ISO/IEC 9899:2018, June 2018,
<https://www.iso.org/standard/74528.html>.
c) The URL in the following reference entry displays a landing page titled
"Welcome to the DVD Forum". We were unable to find a page titled "DVD-Books:
Part 3 DVD-Video Book". How may we update this entry so that readers can find
the reference?
Original:
[DVD-Video]
DVD Forum, "DVD-Books: Part 3 DVD-Video Book", 1 November
1995, <http://www.dvdforum.org/>.
d) We do not see the title "DivX Trick Track Extensions" at the URL
provided. Should the title of this reference entry be updated to "DivX Plus MKV
extension: Smooth FF/RW" per the URL?
Original:
[DivXTrickTrack]
"DivX Trick Track Extensions", 14 December 2010,
<https://web.archive.org/web/20101222001148/
http://labs.divx.com/node/16601>.
e) We note that this standard was withdrawn on May 19, 2005. Are any updates nee
ded?
Original:
[FIPS.46-3]
US National Institute of Standards and Technology, "Data
Encryption Standard (DES)", FIPS PUB 46, 25 October 1999,
<https://csrc.nist.gov/publications/detail/fips/46/3/
archive/1999-10-25>.
f) We have updated the reference as follows to reflect 1) the title shown in
the URL and 2) the authors listed in the Authors section of the URL. Please
let us know any concerns.
[LZO] Tarreau, W., Rodgman, R., and M. Oberhumer, "Lempel-Ziv-
Oberhumer compression", 30 October 2018,
<https://www.kernel.org/doc/Documentation/lzo.txt>.
Current:
[LZO] Tarreau, W. and R. Rodgman, "LZO stream format as
understood by Linux's LZO decompressor", October 2018,
<https://www.kernel.org/doc/Documentation/lzo.txt>.
g) May we update the URL in this reference entry as follows to point
directly to the paper?
Original:
[Twofish] Schneier, B., Kelsey, J., Whiting, D., Wagner, D., Hall,
C., and N. Ferguson, "Twofish: A 128-Bit Block Cipher", 15
June 1998, <https://www.schneier.com/academic/twofish/>.
Current:
[Twofish] Schneier, B., Kelsey, J., Whiting, D., Wagner, D., Hall,
C., and N. Ferguson, "Twofish: A 128-Bit Block Cipher",
June 1998, <https://www.schneier.com/academic/archives/1998/06/twofis
h_a_128-bit_bl.html>.
h) The Security Considerations section points to Section 2.1 of [RFC4732], but
no corresponding entry in the References section was included. We added
[RFC4732] as an informative reference. Please let us know if it should be
normative instead.
-->
<references><name>References</name>
<references><name>Normative References</name>
<reference anchor="CIE-1931" target="https://en.wikipedia.org/wiki/CIE_1931_colo
r_space">
<front>
<title>CIE 1931 color space</title>
<author>
<organization>Wikipedia</organization>
</author>
</front>
</reference>
<reference anchor="ISO639-2" target="https://www.loc.gov/standards/iso639-2/php/
code_list.php">
<front>
<title>Codes for the Representation of Names of Languages</title>
<author>
<organization>International Organization for Standardization</organization
>
</author>
<date year="2017" month="December"></date>
</front>
<seriesInfo name="ISO" value="639-2"></seriesInfo>
</reference>
<reference anchor="ISO9899" target="https://www.iso.org/standard/74528.html">
<front>
<title>Information technology -- Programming languages -- C</title>
<author>
<organization>International Organization for Standardization</organization
>
</author>
<date month="June" year="2018"></date>
</front>
<seriesInfo name="ISO/IEC" value="9899:2018"></seriesInfo>
</reference>
<reference anchor="ITU-H.273" target="https://www.itu.int/rec/T-REC-H.273-202309
-P/en">
<front>
<title>Coding-independent code points for video signal type identification</
title>
<author>
<organization>ITU-T</organization>
</author>
<date year="2023" month="September"></date>
</front>
<seriesInfo name="ITU-T Recommendation" value="H.273"></seriesInfo>
</reference>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.5646.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.1950.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.2119.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.4122.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.6838.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8081.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8126.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8174.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8794.xml"
/>
</references>
<references><name>Informative References</name>
<reference anchor="Err7189" quote-title="false" target="https://www.rfc-editor.o
rg/errata/eid7189">
<front>
<title>Erratum ID 7189</title>
<author>
<organization>RFC Errata</organization>
</author>
</front>
<refcontent>RFC 8794</refcontent>
</reference>
<reference anchor="Err7191" quote-title="false" target="https://www.rfc-editor.o
rg/errata/eid7191">
<front>
<title>Erratum ID 7191</title>
<author>
<organization>RFC Errata</organization>
</author>
</front>
<refcontent>RFC 8794</refcontent>
</reference>
<reference anchor="AVIFormat" target="https://docs.microsoft.com/en-us/windows/w
in32/directshow/avi-riff-file-reference">
<front>
<title>AVI RIFF File Reference</title>
<author>
<organization>Microsoft Corporation</organization> </author> <date year="2
023"
month="June"></date> </front> </reference> <reference anchor="BZIP2"
target="https://sourceware.org/bzip2/"> <front> <title>bzip2</title>
<author fullname="Julian Seward" initials="J." surname="Seward">
<organization></organization>
</author>
<date year="2019" month="July"></date>
</front>
</reference>
<reference anchor="Blowfish" target="https://www.schneier.com/academic/blowfish/
">
<front>
<title>The Blowfish Encryption Algorithm</title>
<author fullname="Bruce Schneier" initials="B." surname="Schneier">
<organization></organization>
</author>
<date year="1993"></date>
</front>
</reference>
<reference anchor="DVD-Video" target="http://www.dvdforum.org/">
<front>
<title>DVD-Books: Part 3 DVD-Video Book</title>
<author>
<organization>DVD Forum</organization>
</author>
<date year="1995" month="November"></date>
</front>
</reference>
<reference anchor="DivXTrickTrack" target="https://web.archive.org/web/201012220
01148/http://labs.divx.com/node/16601">
<front>
<title>DivX Trick Track Extensions</title>
<author></author>
<date year="2010" month="December"></date>
</front>
</reference>
<reference anchor="DivXWorldFonts" target="https://web.archive.org/web/201102141
32246/http://labs.divx.com/node/16602">
<front>
<title>World Fonts</title>
<author></author>
<date year="2010" month="December"></date>
</front>
</reference>
<reference anchor="FIPS197" target="https://csrc.nist.gov/publications/detail/fi
ps/197/final">
<front>
<title>Advanced Encryption Standard (AES)</title>
<author>
<organization>National Institute of Standards and Technology (NIST)</organ
ization>
</author>
<date year="2001" month="November"></date>
</front>
<seriesInfo name="FIPS" value="PUB 197"></seriesInfo>
<seriesInfo name="DOI" value="10.6028/NIST.FIPS.197"></seriesInfo>
</reference>
<reference anchor="FIPS46-3" target="https://csrc.nist.gov/publications/detail/f
ips/46/3/archive/1999-10-25">
<front>
<title>Data Encryption Standard (DES)</title>
<author>
<organization>National Institute of Standards and Technology (NIST)</organ
ization>
</author>
<date year="1999" month="October"></date>
</front>
<seriesInfo name="FIPS" value="PUB 46"></seriesInfo>
</reference>
<reference anchor="FourCC-RGB" target="https://web.archive.org/web/2016060921480
6/https://www.fourcc.org/rgb.php">
<front>
<title>RGB pixel formats</title>
<author>
<organization>FOURCC</organization>
</author>
</front>
</reference>
<reference anchor="FourCC-YUV" target="https://web.archive.org/web/2016060921480
6/https://www.fourcc.org/yuv.php">
<front>
<title>YUV pixel formats</title>
<author>
<organization>FOURCC</organization>
</author>
</front>
</reference>
<reference anchor="JPEG" target="https://www.w3.org/Graphics/JPEG/itu-t81.pdf">
<front>
<title>INFORMATION TECHNOLOGY - DIGITAL COMPRESSION AND CODING OF
CONTINUOUS-TONE STILL IMAGES - REQUIREMENTS AND GUIDELINES</title>
<author>
<organization>ITU</organization>
</author>
<date year="1992" month="September"></date>
</front>
<seriesInfo name="ITU Recommendation" value="T.81"></seriesInfo>
</reference>
<reference anchor="LZO" target="https://www.kernel.org/doc/Documentation/lzo.txt
">
<front>
<title>LZO stream format as understood by Linux's LZO decompressor</title>
<author fullname="Willy Tarreau" initials="W." surname="Tarreau">
<organization></organization>
</author>
<author fullname="Dave Rodgman" initials="R." surname="Rodgman">
<organization></organization>
</author>
<date year="2018" month="October"></date>
</front>
</reference>
<reference anchor="MCF" target="http://mukoli.free.fr/mcf/">
<front>
<title>MCF specification, introduction</title>
<author></author>
</front>
</reference>
<reference anchor="MSRGB" target="https://learn.microsoft.com/en-us/openspecs/wi
ndows_protocols/ms-wmf/4e588f70-bd92-4a6f-b77f-35d0feaf7a57">
<front>
<title>Compression Enumeration</title>
<author>
<organization>Microsoft Corporation</organization>
</author>
<date month="June" year="2021"/>
</front>
</reference>
<reference anchor="MSYUV16" target="https://learn.microsoft.com/en-us/windows/wi
n32/medfound/10-bit-and-16-bit-yuv-video-formats">
<front>
<title>10-bit and 16-bit YUV Video Formats</title>
<author>
<organization>Microsoft Corporation</organization>
</author>
<date month="November" year="2022"/>
</front>
</reference>
<reference anchor="MSYUV8" target="https://learn.microsoft.com/en-us/windows/win
32/medfound/recommended-8-bit-yuv-formats-for-video-rendering">
<front>
<title>Recommended 8-Bit YUV Formats for Video Rendering</title>
<author>
<organization>Microsoft Corporation</organization>
</author>
<date month="January" year="2021"/>
</front>
</reference>
<!-- IESG state: I-D Exists as of 3/1 -->
<xi:include href="https://datatracker.ietf.org/doc/bibxml3/reference.I-D.ietf-ce
llar-codec.xml"/>
<!-- IESG state: I-D Exists as of 3/1 -->
<xi:include href="https://datatracker.ietf.org/doc/bibxml3/reference.I-D.ietf-ce
llar-tags.xml"/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.0959.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.2083.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.3533.xml"
/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.9110.xml"
/>
<xi:include
href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.4732.xml"/>
<reference anchor="SMB-CIFS" target="https://winprotocoldoc.blob.core.windows.ne
t/productionwindowsarchives/MS-CIFS/%5bMS-CIFS%5d.pdf">
<front>
<title>[MS-CIFS]: Common Internet File System (CIFS) Protocol</title>
<author>
<organization>Microsoft Corporation</organization>
</author>
<date year="2020" month="October"/>
</front>
</reference>
<reference anchor="SP800-38A" target="https://nvlpubs.nist.gov/nistpubs/Legacy/S
P/nistspecialpublication800-38a.pdf">
<front>
<title>Recommendation for Block Cipher Modes of Operation: Methods and Techn
iques</title>
<author>
<organization>National Institute of Standards and Technology (NIST)</organ
ization>
</author>
<date year="2001" month="December"></date>
</front>
<seriesInfo name="DOI" value="10.6028/NIST.SP.800-38A"></seriesInfo>
<seriesInfo name="NIST Special Publication" value="800-38A"/>
</reference>
<reference anchor="SP800-67" target="https://nvlpubs.nist.gov/nistpubs/SpecialPu
blications/NIST.SP.800-67r2.pdf">
<front>
<title>Recommendation for the Triple Data Encryption Algorithm (TDEA) Block
Cipher</title>
<author>
<organization>National Institute of Standards and Technology (NIST)</organ
ization>
</author>
<date year="2017" month="November"></date>
</front>
<seriesInfo name="DOI" value="10.6028/NIST.SP.800-67r2"></seriesInfo>
<seriesInfo name="NIST Special Publication" value="800-67"/>
</reference>
<reference anchor="Twofish" target="https://www.schneier.com/academic/twofish/">
<front>
<title>Twofish: A 128-Bit Block Cipher</title>
<author fullname="Bruce Schneier" initials="B." surname="Schneier">
<organization></organization>
</author>
<author fullname="John Kelsey" initials="J." surname="Kelsey">
<organization></organization>
</author>
<author fullname="Doug Whiting" initials="D." surname="Whiting">
<organization></organization>
</author>
<author fullname="David Wagner" initials="D." surname="Wagner">
<organization></organization>
</author>
<author fullname="Chris Hall" initials="C." surname="Hall">
<organization></organization>
</author>
<author fullname="Niels Ferguson" initials="N." surname="Ferguson">
<organization></organization>
</author>
<date year="1998" month="June"></date>
</front>
</reference>
<reference anchor="WebM-Enc" target="https://www.webmproject.org/docs/webm-encry
ption/">
<front>
<title>WebM Encryption</title>
<author fullname="Frank Galligan">
<organization>Google</organization>
</author>
<date year="2016" month="September"></date>
</front>
</reference>
<reference anchor="WebVTT" target="https://www.w3.org/TR/2019/CR-webvtt1-2019040
4/">
<front>
<title>WebVTT: The Web Video Text Tracks Format</title>
<author fullname="Simon Pieters">
<organization>Opera Software AS</organization>
</author>
<author fullname="Silvia Pfeiffer" role="editor">
<organization>NICTA</organization>
</author>
<author fullname="Philip Jaegenstedt">
<organization>Opera Software ASA</organization>
</author>
<author fullname="Ian Hickson">
<organization>Google</organization>
</author>
<date year="2019" month="April"></date>
</front>
<refcontent>W3C Candidate Recommendation</refcontent>
</reference>
</references>
</references>
<section anchor="appendix-a-historic-deprecated-elements"><name>Historic Depreca
ted Elements</name>
<t>As Matroska has evolved since 2002, many parts that were considered for use i
n the format were never
used and often incorrectly designed. Many of the elements that were defined then
are not
found in any known files but were part of public specs. DivX also had a few cust om elements that found in any known files but were part of public specs. DivX also had a few cust om elements that
were designed for custom features.</t> were designed for custom features.</t>
<t>We list these elements that have a known ID that <bcp14>SHOULD NOT</bcp14> be <t>In this appendix, we list elements that have a known ID that <bcp14>SHOULD NO
reused to avoid colliding T</bcp14> be reused to avoid colliding
with existing files. They might be reassigned by IANA in the future if there are with existing files. These might be reassigned by IANA in the future if there ar
no more IDs for a given size. e no more IDs for a given size.
A short description of what each ID was used for is included, but the text is no t normative.</t> A short description of what each ID was used for is included, but the text is no t normative.</t>
<section anchor="silenttracks-element"><name>SilentTracks Element</name> <section anchor="silenttracks-element"><name>SilentTracks Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>master / 0x5854</dd> <dd>master / 0x5854</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\SilentTracks</tt></dd> <dd><tt>\Segment\Cluster\SilentTracks</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The list of tracks that are not used in that part of the stream. <dd>The list of tracks that are not used in that part of the stream.
It is useful when using overlay tracks on seeking or to decide what track to use .</dd> It is useful when using overlay tracks for seeking or deciding what track to use .</dd>
</dl> </dl>
</section> </section>
<section anchor="silenttracknumber-element"><name>SilentTrackNumber Element</nam e> <section anchor="silenttracknumber-element"><name>SilentTrackNumber Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x58D7</dd> <dd>uinteger / 0x58D7</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\SilentTracks\SilentTrackNumber</tt></dd> <dd><tt>\Segment\Cluster\SilentTracks\SilentTrackNumber</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>One of the track number that are not used from now on in the stream. <dd>One of the track numbers that is not used from now on in the stream.
It could change later if not specified as silent in a further Cluster.</dd> It could change later if not specified as silent in a further Cluster.</dd>
</dl> </dl>
</section> </section>
<section anchor="blockvirtual-element"><name>BlockVirtual Element</name> <section anchor="blockvirtual-element"><name>BlockVirtual Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>binary / 0xA2</dd> <dd>binary / 0xA2</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 9516 skipping to change at line 11008
<section anchor="framenumber-element"><name>FrameNumber Element</name> <section anchor="framenumber-element"><name>FrameNumber Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xCD</dd> <dd>uinteger / 0xCD</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\Slices\TimeSlice\FrameNumber</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\Slices\TimeSlice\FrameNumber</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The number of the frame to generate from this lace with this delay <dd>The number of the frame to generate from this lace with this delay
(allow you to generate many frames from the same Block/Frame).</dd> (allows for the generation of many frames from the same Block/Frame).</dd>
</dl> </dl>
</section> </section>
<section anchor="blockadditionid-element"><name>BlockAdditionID Element</name> <section anchor="blockadditionid-element"><name>BlockAdditionID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xCB</dd> <dd>uinteger / 0xCB</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\Slices\TimeSlice\BlockAdditionID</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\Slices\TimeSlice\BlockAdditionID</tt></dd>
skipping to change at line 9576 skipping to change at line 11068
</section> </section>
<section anchor="referenceoffset-element"><name>ReferenceOffset Element</name> <section anchor="referenceoffset-element"><name>ReferenceOffset Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xC9</dd> <dd>uinteger / 0xC9</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\ReferenceFrame\ReferenceOffset</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\ReferenceFrame\ReferenceOffset</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The relative offset, in bytes, from the previous BlockGroup element for this <dd>The relative offset, in bytes, from the previous BlockGroup element for this
Smooth FF/RW video track to the containing BlockGroup element. See <xref target Smooth FF/RW video track to the containing BlockGroup
="DivXTrickTrack"></xref>.</dd> element. See <xref target="DivXTrickTrack"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="referencetimestamp-element"><name>ReferenceTimestamp Element</n ame> <section anchor="referencetimestamp-element"><name>ReferenceTimestamp Element</n ame>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xCA</dd> <dd>uinteger / 0xCA</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\BlockGroup\ReferenceFrame\ReferenceTimestamp</tt></dd> <dd><tt>\Segment\Cluster\BlockGroup\ReferenceFrame\ReferenceTimestamp</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The timestamp of the BlockGroup pointed to by ReferenceOffset, expressed in <dd>The timestamp of the BlockGroup pointed to by ReferenceOffset, expressed in
Track Ticks; see <xref target="timestamp-ticks"></xref>. See <xref target="DivXT Track Ticks; see <xref
rickTrack"></xref>.</dd> target="timestamp-ticks"></xref>. See <xref target="DivXTrickTrack"></xref>.</dd
>
</dl> </dl>
</section> </section>
<section anchor="encryptedblock-element"><name>EncryptedBlock Element</name> <section anchor="encryptedblock-element"><name>EncryptedBlock Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>binary / 0xAF</dd> <dd>binary / 0xAF</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cluster\EncryptedBlock</tt></dd> <dd><tt>\Segment\Cluster\EncryptedBlock</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>Similar to SimpleBlock, see <xref target="simpleblock-structure"></xref>, <dd>Similar to SimpleBlock (see <xref target="simpleblock-structure"></xref>),
but the data inside the Block are Transformed (encrypt and/or signed).</dd> but the data inside the Block are Transformed (encrypted and/or signed).</dd>
</dl> </dl>
</section> </section>
<section anchor="mincache-element"><name>MinCache Element</name> <section anchor="mincache-element"><name>MinCache Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x6DE7</dd> <dd>uinteger / 0x6DE7</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\MinCache</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\MinCache</tt></dd>
skipping to change at line 9639 skipping to change at line 11133
</section> </section>
<section anchor="trackoffset-element"><name>TrackOffset Element</name> <section anchor="trackoffset-element"><name>TrackOffset Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>integer / 0x537F</dd> <dd>integer / 0x537F</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOffset</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOffset</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>A value to add to the Block's Timestamp, expressed in Matroska Ticks -- i.e. <dd>A value to add to the Block's Timestamp, expressed in Matroska Ticks -- i.e.
, in nanoseconds; see <xref target="timestamp-ticks"></xref>. , in nanoseconds; see <xref
target="timestamp-ticks"></xref>.
This can be used to adjust the playback offset of a track.</dd> This can be used to adjust the playback offset of a track.</dd>
</dl> </dl>
</section> </section>
<section anchor="codecsettings-element"><name>CodecSettings Element</name> <section anchor="codecsettings-element"><name>CodecSettings Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>utf-8 / 0x3A9697</dd> <dd>utf-8 / 0x3A9697</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 9676 skipping to change at line 11171
</section> </section>
<section anchor="codecdownloadurl-element"><name>CodecDownloadURL Element</name> <section anchor="codecdownloadurl-element"><name>CodecDownloadURL Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>string / 0x26B240</dd> <dd>string / 0x26B240</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\CodecDownloadURL</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\CodecDownloadURL</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<!-- [rfced] Please clarify "A URL to download about". Should this text be
updated as follows?
Original:
documentation: A URL to download about the codec used.
Perhaps:
documentation: A URL to download information about the codec used.
-->
<dd>A URL to download about the codec used.</dd> <dd>A URL to download about the codec used.</dd>
</dl> </dl>
</section> </section>
<section anchor="codecdecodeall-element"><name>CodecDecodeAll Element</name> <section anchor="codecdecodeall-element"><name>CodecDecodeAll Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xAA</dd> <dd>uinteger / 0xAA</dd>
<dt>path:</dt> <dt>path:</dt>
skipping to change at line 9701 skipping to change at line 11206
<section anchor="trackoverlay-element"><name>TrackOverlay Element</name> <section anchor="trackoverlay-element"><name>TrackOverlay Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x6FAB</dd> <dd>uinteger / 0x6FAB</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrackOverlay</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrackOverlay</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>Specify that this track is an overlay track for the Track specified (in the u-integer). <dd>Specify that this track is an overlay track for the Track specified (in the u-integer).
That means when this track has a gap on SilentTracks, This means that when this track has a gap on SilentTracks, the overlay track sho
the overlay track should be used instead. The order of multiple TrackOverlay mat uld be used instead. The order of multiple TrackOverlay matters; the first one i
ters, the first one is the one that should be used. s the one that should be used.
If not found it should be the second, etc.</dd> If the first one is not found, it should be the second, etc.</dd>
</dl> </dl>
</section> </section>
<section anchor="aspectratiotype-element"><name>AspectRatioType Element</name> <section anchor="aspectratiotype-element"><name>AspectRatioType Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x54B3</dd> <dd>uinteger / 0x54B3</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\AspectRatioType</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\AspectRatioType</tt></dd>
skipping to change at line 9727 skipping to change at line 11231
</section> </section>
<section anchor="gammavalue-element"><name>GammaValue Element</name> <section anchor="gammavalue-element"><name>GammaValue Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>float / 0x2FB523</dd> <dd>float / 0x2FB523</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\GammaValue</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\GammaValue</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>Gamma Value.</dd> <dd>Gamma value.</dd>
</dl> </dl>
</section> </section>
<section anchor="framerate-element"><name>FrameRate Element</name> <section anchor="framerate-element"><name>FrameRate Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>float / 0x2383E3</dd> <dd>float / 0x2383E3</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Video\FrameRate</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Video\FrameRate</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>Number of frames per second. This value is Informational only. It is intende <dd>Number of frames per second. This value is informational only. It is intende
d for constant frame rate streams, and should not be used for a variable frame r d for constant frame rate streams and should not be
ate TrackEntry.</dd> used for a variable frame rate TrackEntry.</dd>
</dl> </dl>
</section> </section>
<section anchor="channelpositions-element"><name>ChannelPositions Element</name> <section anchor="channelpositions-element"><name>ChannelPositions Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>binary / 0x7D7B</dd> <dd>binary / 0x7D7B</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\Audio\ChannelPositions</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\Audio\ChannelPositions</tt></dd>
skipping to change at line 9763 skipping to change at line 11268
</section> </section>
<section anchor="tricktrackuid-element"><name>TrickTrackUID Element</name> <section anchor="tricktrackuid-element"><name>TrickTrackUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xC0</dd> <dd>uinteger / 0xC0</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrickTrackUID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrickTrackUID</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The TrackUID of the Smooth FF/RW video in the paired EBML structure correspo <dd>The TrackUID of the Smooth FF/RW video in the paired EBML structure correspo
nding to this video track. See <xref target="DivXTrickTrack"></xref>.</dd> nding to this video track. See <xref
target="DivXTrickTrack"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="tricktracksegmentuid-element"><name>TrickTrackSegmentUID Elemen t</name> <section anchor="tricktracksegmentuid-element"><name>TrickTrackSegmentUID Elemen t</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>binary / 0xC1</dd> <dd>binary / 0xC1</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrickTrackSegmentUID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrickTrackSegmentUID</tt></dd>
skipping to change at line 9787 skipping to change at line 11293
</section> </section>
<section anchor="tricktrackflag-element"><name>TrickTrackFlag Element</name> <section anchor="tricktrackflag-element"><name>TrickTrackFlag Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xC6</dd> <dd>uinteger / 0xC6</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrickTrackFlag</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrickTrackFlag</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>Set to 1 if this video track is a Smooth FF/RW track. If set to 1, MasterTra <dd>Set to 1 if this video track is a Smooth FF/RW track. If set to 1, MasterTra
ckUID and MasterTrackSegUID should be present and BlockGroups for this track mus ckUID and MasterTrackSegUID should be present, and
t contain ReferenceFrame structures. BlockGroups for this track must contain ReferenceFrame structures.
Otherwise, TrickTrackUID and TrickTrackSegUID must be present if this track has Otherwise, TrickTrackUID and TrickTrackSegUID must be present if this track has
a corresponding Smooth FF/RW track. See <xref target="DivXTrickTrack"></xref>.</ a corresponding Smooth FF/RW track. See <xref
dd> target="DivXTrickTrack"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="trickmastertrackuid-element"><name>TrickMasterTrackUID Element< /name> <section anchor="trickmastertrackuid-element"><name>TrickMasterTrackUID Element< /name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xC7</dd> <dd>uinteger / 0xC7</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrickMasterTrackUID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrickMasterTrackUID</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The TrackUID of the video track in the paired EBML structure that correspond <dd>The TrackUID of the video track in the paired EBML structure that correspond
s to this Smooth FF/RW track. See <xref target="DivXTrickTrack"></xref>.</dd> s to this Smooth FF/RW track. See <xref
target="DivXTrickTrack"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="trickmastertracksegmentuid-element"><name>TrickMasterTrackSegme ntUID Element</name> <section anchor="trickmastertracksegmentuid-element"><name>TrickMasterTrackSegme ntUID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>binary / 0xC4</dd> <dd>binary / 0xC4</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\TrickMasterTrackSegmentUID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\TrickMasterTrackSegmentUID</tt></dd>
skipping to change at line 9836 skipping to change at line 11345
</section> </section>
<section anchor="contentsigkeyid-element"><name>ContentSigKeyID Element</name> <section anchor="contentsigkeyid-element"><name>ContentSigKeyID Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>binary / 0x47E4</dd> <dd>binary / 0x47E4</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentSigKeyID</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentSigKeyID</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>This is the ID of the private key the data was signed with.</dd> <dd>This is the ID of the private key that the data was signed with.</dd>
</dl> </dl>
</section> </section>
<section anchor="contentsigalgo-element"><name>ContentSigAlgo Element</name> <section anchor="contentsigalgo-element"><name>ContentSigAlgo Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x47E5</dd> <dd>uinteger / 0x47E5</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentSigAlgo</tt></dd> <dd><tt>\Segment\Tracks\TrackEntry\ContentEncodings\ContentEncoding\ContentEncry ption\ContentSigAlgo</tt></dd>
skipping to change at line 9900 skipping to change at line 11409
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0xEB</dd> <dd>uinteger / 0xEB</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueReference\CueRefCodecState</ tt></dd> <dd><tt>\Segment\Cues\CuePoint\CueTrackPositions\CueReference\CueRefCodecState</ tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The Segment Position of the Codec State corresponding to this referenced Ele ment. <dd>The Segment Position of the Codec State corresponding to this referenced Ele ment.
0 means that the data is taken from the initial Track Entry.</dd> 0 means that the data is taken from the initial Track Entry.</dd>
</dl> </dl>
</section> </section>
<section anchor="filereferral-element"><name>FileReferral Element</name> <section anchor="filereferral-element"><name>FileReferral Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>binary / 0x4675</dd> <dd>binary / 0x4675</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments\AttachedFile\FileReferral</tt></dd> <dd><tt>\Segment\Attachments\AttachedFile\FileReferral</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>A binary value that a track/codec can refer to when the attachment is needed .</dd> <dd>A binary value that a track/codec can refer to when the attachment is needed .</dd>
</dl> </dl>
</section> </section>
<section anchor="fileusedstarttime-element"><name>FileUsedStartTime Element</nam e> <section anchor="fileusedstarttime-element"><name>FileUsedStartTime Element</nam e>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x4661</dd> <dd>uinteger / 0x4661</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments\AttachedFile\FileUsedStartTime</tt></dd> <dd><tt>\Segment\Attachments\AttachedFile\FileUsedStartTime</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The timestamp at which this optimized font attachment comes into context, ex <dd>The timestamp at which this optimized font attachment comes into context, ex
pressed in Segment Ticks which is based on TimestampScale. See <xref target="Div pressed in Segment Ticks, which are based on
XWorldFonts"></xref>.</dd> TimestampScale. See <xref target="DivXWorldFonts"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="fileusedendtime-element"><name>FileUsedEndTime Element</name> <section anchor="fileusedendtime-element"><name>FileUsedEndTime Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x4662</dd> <dd>uinteger / 0x4662</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Attachments\AttachedFile\FileUsedEndTime</tt></dd> <dd><tt>\Segment\Attachments\AttachedFile\FileUsedEndTime</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>The timestamp at which this optimized font attachment goes out of context, e <dd>The timestamp at which this optimized font attachment goes out of context, e
xpressed in Segment Ticks which is based on TimestampScale. See <xref target="Di xpressed in Segment Ticks, which are based on
vXWorldFonts"></xref>.</dd> TimestampScale. See <xref target="DivXWorldFonts"></xref>.</dd>
</dl> </dl>
</section> </section>
<section anchor="tagdefaultbogus-element"><name>TagDefaultBogus Element</name> <section anchor="tagdefaultbogus-element"><name>TagDefaultBogus Element</name>
<dl spacing="compact"> <dl spacing="compact">
<dt>type / id:</dt> <dt>type / id:</dt>
<dd>uinteger / 0x44B4</dd> <dd>uinteger / 0x44B4</dd>
<dt>path:</dt> <dt>path:</dt>
<dd><tt>\Segment\Tags\Tag\+SimpleTag\TagDefaultBogus</tt></dd> <dd><tt>\Segment\Tags\Tag\+SimpleTag\TagDefaultBogus</tt></dd>
<dt>documentation:</dt> <dt>documentation:</dt>
<dd>A variant of the TagDefault element with a bogus Element ID; see <xref targe t="tagdefault-element"></xref>.</dd> <dd>A variant of the TagDefault element with a bogus Element ID; see <xref targe t="tagdefault-element"></xref>.</dd>
</dl> </dl>
</section> </section>
</section> </section>
</back>
</middle> <!-- [rfced] Formatting with <tt>
<back> a) Sometimes the word "element" is included in the <tt> tags and sometimes it
<references><name>Normative References</name> appears outside the tags. For example, we see both of the following in the xml:
<reference anchor="BCP47" target="https://www.rfc-editor.org/info/rfc5646">
<front>
<title>Tags for Identifying Languages</title>
<author fullname="A. Phillips" initials="A." surname="Phillips" role="editor
">
<organization></organization>
</author>
<author fullname="M. Davis" initials="M." surname="Davis" role="editor">
<organization></organization>
</author>
<date year="2009" month="September"></date>
</front>
<seriesInfo name="BCP" value="47"></seriesInfo>
<seriesInfo name="RFC" value="5646"></seriesInfo>
<seriesInfo name="DOI" value="10.17487/RFC5646"></seriesInfo>
</reference>
<reference anchor="CIE-1931" target="https://en.wikipedia.org/wiki/CIE_1931_colo
r_space">
<front>
<title>CIE 1931 Standard Colorimetric System</title>
<author>
<organization>Commission Internationale de l&#39;Eclairage</organization>
</author>
<date year="1931"></date>
</front>
</reference>
<reference anchor="ISO639-2" target="https://www.loc.gov/standards/iso639-2/php/
code_list.php">
<front>
<title>Codes for the Representation of Names of Languages</title>
<author>
<organization>United States Library Of Congress</organization>
</author>
<date year="2017" month="December" day="21"></date>
</front>
<seriesInfo name="ISO" value="639-2:1998"></seriesInfo>
</reference>
<reference anchor="ISO9899" target="https://www.iso.org/standard/57853.html">
<front>
<title>Information technology -- Programming languages -- C</title>
<author>
<organization>International Organization for Standardization</organization
>
</author>
<date year="2011"></date>
</front>
<seriesInfo name="ISO/IEC" value="9899:2011"></seriesInfo>
</reference>
<reference anchor="ITU-H.273" target="https://www.itu.int/rec/T-REC-H.273/en">
<front>
<title>Coding-independent code points for video signal type identification</
title>
<author>
<organization>International Telecommunication Union</organization>
</author>
<date year="2021" month="September" day="24"></date>
</front>
<seriesInfo name="ITU" value="H.273"></seriesInfo>
</reference>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.1950.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.2119.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.4122.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.6838.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.8081.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.8126.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.8174.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.8794.
xml"/>
</references>
<references><name>Informative References</name>
<reference anchor="AVIFormat" target="https://docs.microsoft.com/en-us/windows/w
in32/directshow/avi-riff-file-reference">
<front>
<title>AVI RIFF File Reference</title>
<author>
<organization>Microsoft</organization>
</author>
<date year="2018" month="May" day="31"></date>
</front>
</reference>
<reference anchor="BZIP2" target="https://sourceware.org/bzip2/">
<front>
<title>bzip2</title>
<author fullname="Julian Seward" initials="J." surname="Seward">
<organization></organization>
</author>
<date year="1996" month="July" day="18"></date>
</front>
</reference>
<reference anchor="Blowfish" target="https://www.schneier.com/academic/blowfish/
">
<front>
<title>The Blowfish Encryption Algorithm</title>
<author fullname="Bruce Schneier" initials="B." surname="Schneier">
<organization></organization>
</author>
<date year="1993"></date>
</front>
</reference>
<reference anchor="DVD-Video" target="http://www.dvdforum.org/">
<front>
<title>DVD-Books: Part 3 DVD-Video Book</title>
<author>
<organization>DVD Forum</organization>
</author>
<date year="1995" month="November" day="1"></date>
</front>
</reference>
<reference anchor="DivXTrickTrack" target="https://web.archive.org/web/201012220
01148/http://labs.divx.com/node/16601">
<front>
<title>DivX Trick Track Extensions</title>
<author></author>
<date year="2010" month="December" day="14"></date>
</front>
</reference>
<reference anchor="DivXWorldFonts" target="https://web.archive.org/web/201102141
32246/http://labs.divx.com/node/16602">
<front>
<title>DivX World Fonts Extensions</title>
<author></author>
<date year="2010" month="December" day="14"></date>
</front>
</reference>
<reference anchor="FIPS.197" target="https://csrc.nist.gov/publications/detail/f
ips/197/final">
<front>
<title>Advanced Encryption Standard (AES)</title>
<author>
<organization>US National Institute of Standards and Technology</organizat
ion>
</author>
<date year="2001" month="November" day="26"></date>
</front>
<seriesInfo name="FIPS" value="PUB 197"></seriesInfo>
<seriesInfo name="DOI" value="10.6028/NIST.FIPS.197"></seriesInfo>
</reference>
<reference anchor="FIPS.46-3" target="https://csrc.nist.gov/publications/detail/
fips/46/3/archive/1999-10-25">
<front>
<title>Data Encryption Standard (DES)</title>
<author>
<organization>US National Institute of Standards and Technology</organizat
ion>
</author>
<date year="1999" month="October" day="25"></date>
</front>
<seriesInfo name="FIPS" value="PUB 46"></seriesInfo>
</reference>
<reference anchor="FourCC-RGB" target="https://web.archive.org/web/2016060921480
6/https://www.fourcc.org/rgb.php">
<front>
<title>RGB Pixel Format FourCCs</title>
<author>
<organization>Silicon.dk ApS</organization>
</author>
</front>
</reference>
<reference anchor="FourCC-YUV" target="https://web.archive.org/web/2016060921480
6/https://www.fourcc.org/yuv.php">
<front>
<title>YUV Pixel Format FourCCs</title>
<author>
<organization>Silicon.dk ApS</organization>
</author>
</front>
</reference>
<reference anchor="JPEG" target="https://www.w3.org/Graphics/JPEG/itu-t81.pdf">
<front>
<title>Digital Compression and Coding of Continuous-Tone Still Images</title
>
<author>
<organization>International Telegraph and Telephone Consultative Committee
</organization>
</author>
<date year="1992" month="September"></date>
</front>
<seriesInfo name="ITU" value="T.81"></seriesInfo>
</reference>
<reference anchor="LZO" target="https://www.kernel.org/doc/Documentation/lzo.txt
">
<front>
<title>Lempel-Ziv-Oberhumer compression</title>
<author fullname="Willy Tarreau" initials="W." surname="Tarreau">
<organization></organization>
</author>
<author fullname="Dave Rodgman" initials="R." surname="Rodgman">
<organization></organization>
</author>
<author fullname="Markus Oberhumer" initials="M." surname="Oberhumer">
<organization></organization>
</author>
<date year="2018" month="October" day="30"></date>
</front>
</reference>
<reference anchor="MCF" target="http://mukoli.free.fr/mcf/">
<front>
<title>Media Container Format</title>
<author></author>
<date year="2002" month="July" day="17"></date>
</front>
</reference>
<reference anchor="MSRGB" target="https://learn.microsoft.com/en-us/openspecs/wi
ndows_protocols/ms-wmf/4e588f70-bd92-4a6f-b77f-35d0feaf7a57">
<front>
<title>WMF Compression Enumeration</title>
<author>
<organization>Microsoft</organization>
</author>
</front>
</reference>
<reference anchor="MSYUV16" target="https://learn.microsoft.com/en-us/windows/wi
n32/medfound/10-bit-and-16-bit-yuv-video-formats">
<front>
<title>10-bit and 16-bit YUV Video Formats</title>
<author>
<organization>Microsoft</organization>
</author>
</front>
</reference>
<reference anchor="MSYUV8" target="https://learn.microsoft.com/en-us/windows/win
32/medfound/recommended-8-bit-yuv-formats-for-video-rendering">
<front>
<title>Recommended 8-Bit YUV Formats for Video Rendering</title>
<author>
<organization>Microsoft</organization>
</author>
</front>
</reference>
<reference anchor="MatroskaCodec" target="">
<front>
<title>Media Container Codec Specifications</title>
<author fullname="Steve Lhomme" initials="S." surname="Lhomme"></author>
<author fullname="Moritz Bunkus" initials="M." surname="Bunkus"></author>
<author fullname="Dave Rice" initials="D." surname="Rice"></author>
<date year="2021" month="April" day="12"></date>
</front>
<seriesInfo name="Internet-Draft" value="draft-ietf-cellar-codec-10"></seriesI
nfo>
</reference>
<reference anchor="MatroskaTags" target="">
<front>
<title>Matroska Media Container Tag Specifications</title>
<author fullname="Steve Lhomme" initials="S." surname="Lhomme"></author>
<author fullname="Moritz Bunkus" initials="M." surname="Bunkus"></author>
<author fullname="Dave Rice" initials="D." surname="Rice"></author>
<date year="2021" month="April" day="12"></date>
</front>
<seriesInfo name="Internet-Draft" value="draft-ietf-cellar-tags-10"></seriesIn
fo>
</reference>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.0959.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.2083.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.3533.
xml"/>
<xi:include href="https://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.9110.
xml"/>
<reference anchor="SMB-CIFS" target="https://winprotocoldoc.blob.core.windows.ne
t/productionwindowsarchives/MS-CIFS/%5bMS-CIFS%5d.pdf">
<front>
<title>Common Internet File System (CIFS) Protocol</title>
<author>
<organization>Microsoft Corporation</organization>
</author>
<date year="2020" month="October" day="1"></date>
</front>
</reference>
<reference anchor="SP.800-38A" target="https://csrc.nist.gov/publications/detail
/fips/197/final">
<front>
<title>Recommendation for Block Cipher Modes of Operation: Methods and Techn
iques</title>
<author>
<organization>US National Institute of Standards and Technology</organizat
ion>
</author>
<date year="2001" month="December" day="01"></date>
</front>
<seriesInfo name="DOI" value="10.6028/NIST.SP.800-38A"></seriesInfo>
</reference>
<reference anchor="SP.800-67" target="https://csrc.nist.gov/publications/detail/
sp/800-67/rev-2/final">
<front>
<title>Recommendation for the Triple Data Encryption Algorithm (TDEA) Block
Cipher</title>
<author>
<organization>US National Institute of Standards and Technology</organizat
ion>
</author>
<date year="2017" month="November" day="01"></date>
</front>
<seriesInfo name="DOI" value="10.6028/10.6028/NIST.SP.800-67r2"></seriesInfo>
</reference>
<reference anchor="Twofish" target="https://www.schneier.com/academic/twofish/">
<front>
<title>Twofish: A 128-Bit Block Cipher</title>
<author fullname="Bruce Schneier" initials="B." surname="Schneier">
<organization></organization>
</author>
<author fullname="John Kelsey" initials="J." surname="Kelsey">
<organization></organization>
</author>
<author fullname="Doug Whiting" initials="D." surname="Whiting">
<organization></organization>
</author>
<author fullname="David Wagner" initials="D." surname="Wagner">
<organization></organization>
</author>
<author fullname="Chris Hall" initials="C." surname="Hall">
<organization></organization>
</author>
<author fullname="Niels Ferguson" initials="N." surname="Ferguson">
<organization></organization>
</author>
<date year="1998" month="June" day="15"></date>
</front>
</reference>
<reference anchor="WebM-Enc" target="https://www.webmproject.org/docs/webm-encry
ption/">
<front>
<title>WebM Encryption</title>
<author fullname="Frank Galligan">
<organization>Google</organization>
</author>
<date year="2016" month="September" day="19"></date>
</front>
</reference>
<reference anchor="WebVTT" target="https://www.w3.org/TR/webvtt1/#webvtt-cue-ide
ntifier">
<front>
<title>WebVTT Cue Identifier</title>
<author fullname="Simon Pieters">
<organization>Opera Software AS</organization>
</author>
<author fullname="Silvia Pfeiffer" role="editor">
<organization>NICTA</organization>
</author>
<author fullname="Philip Jaegenstedt">
<organization>Opera Software ASA</organization>
</author>
<author fullname="Ian Hickson">
<organization>Google</organization>
</author>
<date year="2019" month="April" day="4"></date>
</front>
</reference>
</references>
</back> <tt>SimpleBlock Element</tt>
<tt>SimpleBlock</tt> Element
We suggest making such terms consistent. Should "Element" appear in <tt>
tagging, or should it appear outside the tags?
b) The following terms appear both with and without <tt> in the xml. Please
review and let us know if the tagging should be consistent.
Attachment
Attachments
Block
BlockAdditions
BlockDuration
BlockGroup
ChapProcessCodecID
ChapProcessData
ChapProcessPrivate
Chapter
ChapterAtom
Chapters
ChapterSegmentEditionUID
ChapterSegmentUUID
ChapterTranslate
ChapterUID
Cluster
Clusters
CodecID
Cues
DiscardPadding
Edition
EditionEntry
Editions
Element
FileName
Matroska
NextUUID
PrevUUID
SeekHead
Segment
Segments
SegmentUUID
SimpleBlock
Tag
Tags
TagString
Timestamp
TimestampScale
Track
TrackNumber
Tracks
TrackTranslate
-->
<!-- [rfced] Terminology
a) Please review the following similar terms used in the document. Should these
be
consistent?
Audio/Video container
audio and visual container
audiovisual data container
Original:
First, it is essential to clarify exactly "What an Audio/Video
container is", to avoid any misunderstandings:
...
As an audio and visual container format, a Matroska file or stream
will potentially encapsulate numerous byte streams created with a
variety of codecs.
...
Matroska is an audiovisual data container format.
...
This document defines the Matroska audiovisual data container
structure,
b) Please review the following and let us know if both forms are correct or if
updates are needed for consistency.
Attachment Element vs. Attachments Element
Note: "Attachments Element" is defined in Section 5.1.6.
Track Element vs. Tracks Element
Note: "Tracks Element" is defined in Section 5.1.4.
Cue Element vs. Cues Element
Note: "Cues Element" is defined in Section 5.1.5.
Chapters Element vs. Chapter Element vs. Chapter element
Note: "Chapters Element" is defined in Section 5.1.7, but perhaps "Chapter
element" refers to elements like "ChapterAtom" and "ChapterTrack"?
c) In these sentences, should "Attachment" be updated to "Attachments Element"?
When stored,
the normal cover SHOULD be the first Attachment in storage order.
...
Thus, for
maximum compatibility, it's usually better to put the strings in the
TrackEntry, ChapterAtom, and Attachment and keep the tags matching
these values if tags are also used.
d) Please review the use of lowercase "attachment" in the document. Should any
instances be updated to "Attachments Element"?
e) We note inconsistencies in the terms listed below. We chose the form on the
right. Please let us know any objections.
Matroska reader vs. Matroska Reader
Matroska writer vs. Matroska Writer
Matroska player vs. Matroska Player
f) We see the following forms used in the document. We believe that the
capitalized form indicates the element (even when not followed by the word
"Element"), while the lowercase is for general use. Please review that this
usage is consistent.
Tag vs. tag
Tags vs. tags
Example general use:
When tags from the previous layout
Examples of capped form not followed by "Element":
...has its UID listed in the Tags.
The Tags contain all extra information
g) We note that the following terms are used inconsistently throughout the
document. Please review and let us know if any updates are needed for consistenc
y.
segment vs. Segment
alpha vs. Alpha
Note: In context of "Alpha data" and "alpha channel data".
AnaGlyph vs. anaglyph
EBML header vs. EBML Header
block element vs. Block Element
block header vs. Block header vs. Block Header
Note: We will make capitalization of "header" in "SimpleBlock header" consiste
nt
with the decision here.
block vs. Block
Note: In general text, e.g., "of the virtual block" and "contained in the Bloc
k".
chapter codec vs. Chapter Codec
chapter edition(s) vs. Chapter Edition(s)
child element vs. Child Element
codec ID vs. Codec ID
Note: We will not change "CodecID" used in element names.
codec state vs. Codec State
filename vs. file name
Note: We are asking about instances aside from "FileName Element".
fourcc vs. FourCC
Note: "fourcc" is only used in the context of "fourcc field".
linked Segment vs. Linked Segment
track name vs. Track Name
Track vs. track
Note: In general text, e.g., "For separate tracks" and "end of a Track")
trackUID vs. TrackUID
segment vs. Segment
cluster vs. Cluster
Stereo-3D vs. stereo 3D
edition vs. Edition
Control Track vs. control track
-->
<!-- [rfced] Capitalization of "element"
a) We note that capitalization of "element" is inconsistent when following the n
ame
of elements. Please review and let us know if any updates are needed for
consistency.
Some examples:
Capitalized:
Root Element
Top-Level Element
Empty Element
Segment Element
Info Element
SeekHead Element
Chapters Element
Cluster Element
Lowercase:
DiscardPadding element
NextFilename element
TagDefault element
TrackEntry\Name element
AttachmentLink element
Mixed capitalization:
CRC-32 element vs. CRC-32 Element
ReferenceBlock element vs. ReferenceBlock Element
Chapter element vs. Chapter Element
ChapterTimeEnd element vs. ChapterTimeEnd Element
ChapterSegmentUUID element vs. ChapterSegmentUUID Element
ChapterAtom element vs. ChapterAtom Element
b) Should "element" (lowercase) vs. "Element" (uppercase) be used in general tex
t?
Some examples:
When both values exist in the file, the value found in Tags takes
precedence over the value found in original location of the element.
In that case these elements are informational only.
These Elements
allow edges of the frame that are not intended for display,
An Element which is not
stored within a Segment Element, such as the Elements of the EBML
Header, do not have a Segment Position.
The Segment Position of an Element refers to the position of the
first octet of the Element ID of that Element, measured in octets,
from the beginning of the Element Data section of the containing
Segment Element.
-->
<!-- [rfced] Abbreviations
a) FYI - We have added expansions for abbreviations upon first use per Section
3.6 of RFC 7322 ("RFC Style Guide"). Please review each expansion in the
document carefully to ensure correctness.
b) How may we expanded "VANC" here? We do not see this in published RFCs.
Original:
These Elements allow edges of the frame that are not intended for
display, such as the sprockets of a full-frame film scan or the VANC area of a
digitized analog videotape...
c) Should "SBR" be expanded as "Spectral Band Replication"?
Original:
Real output sampling frequency in Hz (used for SBR techniques).
Perhaps:
Real output sampling frequency in Hz that is used for Spectral Band
Replication (SBR) techniques.
-->
<!-- [rfced] Please review the "Inclusive Language" portion of the online
Style Guide <https://www.rfc-editor.org/styleguide/part2/#inclusive_language>
and let us know if any changes are needed. For example, please consider whether
the following should be updated:
black
white
master
-->
</rfc> </rfc>
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