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<head><meta lang="" property="dc:language" content="en">
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<title>Media Source Extensions Byte Stream Format Registry</title>
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<body class="h-entry" role="document" id="respecDocument"><div class="head" role="contentinfo" id="respecHeader">
<p>
<a class="logo" href="http://www.w3.org/"><img width="72" height="48" src="https://www.w3.org/Icons/w3c_home" alt="W3C"></a>
</p>
<h1 class="title p-name" id="title" property="dcterms:title">Media Source Extensions Byte Stream Format Registry</h1>
<h2 id="w3c-editor-s-draft-20-july-2016"><abbr title="World Wide Web Consortium">W3C</abbr> Editor's Draft <time property="dcterms:issued" class="dt-published" datetime="2016-07-20">20 July 2016</time></h2>
<dl>
<dt>This version:</dt>
<dd><a class="u-url" href="https://w3c.github.io/media-source/byte-stream-format-registry.html">https://w3c.github.io/media-source/byte-stream-format-registry.html</a></dd>
<dt>Latest published version:</dt>
<dd><a href="http://www.w3.org/TR/media-source/">http://www.w3.org/TR/media-source/</a></dd>
<dt>Latest editor's draft:</dt>
<dd><a href="https://w3c.github.io/media-source/byte-stream-format-registry.html">https://w3c.github.io/media-source/byte-stream-format-registry.html</a></dd>
<dt>Editors:</dt>
<dd class="p-author h-card vcard" property="bibo:editor" resource="_:editor0"><span property="rdf:first" typeof="foaf:Person"><span property="foaf:name" class="p-name fn">Matthew Wolenetz</span>, <a property="foaf:workplaceHomepage" class="p-org org h-org h-card" href="http://www.google.com/">Google Inc.</a></span>
<span property="rdf:rest" resource="_:editor1"></span>
</dd>
<dd class="p-author h-card vcard" resource="_:editor1"><span property="rdf:first" typeof="foaf:Person"><span property="foaf:name" class="p-name fn">Jerry Smith</span>, <a property="foaf:workplaceHomepage" class="p-org org h-org h-card" href="http://www.microsoft.com/">Microsoft Corporation</a></span>
<span property="rdf:rest" resource="_:editor2"></span>
</dd>
<dd class="p-author h-card vcard" resource="_:editor2"><span property="rdf:first" typeof="foaf:Person"><span property="foaf:name" class="p-name fn">Aaron Colwell (until April 2015)</span>, <a property="foaf:workplaceHomepage" class="p-org org h-org h-card" href="http://www.google.com/">Google Inc.</a></span>
<span property="rdf:rest" resource="rdf:nil"></span>
</dd>
<dt>Repository:</dt>
<dd>
<a href="https://github.com/w3c/media-source/">
We are on GitHub
</a>
</dd>
<dd>
<a href="https://github.com/w3c/media-source/issues">
File a bug
</a>
</dd>
<dd>
<a href="https://github.com/w3c/media-source/commits/gh-pages/byte-stream-format-registry-respec.html">
Commit history
</a>
</dd>
<dt>Mailing list:</dt>
<dd>
<a href="https://lists.w3.org/Archives/Public/public-html-media/">
</a>
</dd>
</dl>
<p class="copyright">
<a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> ©
2016
<a href="http://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup>
(<a href="http://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>,
<a href="http://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>,
<a href="http://www.keio.ac.jp/">Keio</a>, <a href="http://ev.buaa.edu.cn/">Beihang</a>).
<abbr title="World Wide Web Consortium">W3C</abbr> <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>,
<a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and
<a rel="license" href="http://www.w3.org/Consortium/Legal/copyright-documents">document use</a>
rules apply.
</p>
<hr title="Separator for header">
</div>
<section id="abstract" class="introductory" property="dc:abstract"><h2 id="h-abstract" resource="#h-abstract"><span property="xhv:role" resource="xhv:heading">Abstract</span></h2>
<p>This specification defines the byte stream formats for use with the <a href="index.html#">Media Source Extensions</a> specification.</p>
</section><section id="sotd" class="introductory"><h2 id="h-sotd" resource="#h-sotd"><span property="xhv:role" resource="xhv:heading">Status of This Document</span></h2>
<p>
<em>This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current <abbr title="World Wide Web Consortium">W3C</abbr> publications and the latest revision of this technical report can be found in the <a href="http://www.w3.org/TR/"><abbr title="World Wide Web Consortium">W3C</abbr> technical reports index</a> at http://www.w3.org/TR/.</em>
</p>
<p>The working group maintains <a href="https://github.com/w3c/media-source/issues">a list of all bug reports that the editors have not yet tried to address</a>; there may also be open bugs in the <a href="http://w3.org/brief/Mjcw">previous bug tracker</a>.</p>
<p>Implementors should be aware that this specification is not stable. <strong>Implementors who are not taking part in the discussions are likely to find the specification changing out from under them in incompatible ways.</strong> Vendors interested in implementing this specification before it eventually reaches the Candidate Recommendation stage should join the mailing list mentioned below and take part in the discussions.</p>
<p>
This document was published by the <a href="http://www.w3.org/html/wg/">HTML Media Extensions Working Group</a> as an Editor's Draft.
If you wish to make comments regarding this document, please send them to
<a href="mailto:[email protected]">[email protected]</a>
(<a href="mailto:[email protected]?subject=subscribe">subscribe</a>,
<a href="http://lists.w3.org/Archives/Public/public-html-media/">archives</a>).
All comments are welcome.
</p>
<p>
Publication as an Editor's Draft does not imply endorsement by the <abbr title="World Wide Web Consortium">W3C</abbr>
Membership. This is a draft document and may be updated, replaced or obsoleted by other
documents at any time. It is inappropriate to cite this document as other than work in
progress.
</p>
<p>
This document was produced by
a group
operating under the
<a id="sotd_patent" property="w3p:patentRules" href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 <abbr title="World Wide Web Consortium">W3C</abbr> Patent
Policy</a>.
<abbr title="World Wide Web Consortium">W3C</abbr> maintains a <a href="http://www.w3.org/2004/01/pp-impl/40318/status" rel="disclosure">public list of any patent
disclosures</a>
made in connection with the deliverables of
the group; that page also includes
instructions for disclosing a patent. An individual who has actual knowledge of a patent
which the individual believes contains
<a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential
Claim(s)</a> must disclose the information in accordance with
<a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section
6 of the <abbr title="World Wide Web Consortium">W3C</abbr> Patent Policy</a>.
</p>
<p>This document is governed by the <a id="w3c_process_revision" href="http://www.w3.org/2015/Process-20150901/">1 September 2015 <abbr title="World Wide Web Consortium">W3C</abbr> Process Document</a>.
</p>
</section><section id="toc"><h2 class="introductory" id="h-toc" resource="#h-toc"><span property="xhv:role" resource="xhv:heading">Table of Contents</span></h2><ul class="toc" role="directory"><li class="tocline"><a href="#purpose" class="tocxref"><span class="secno">1. </span>Purpose</a></li><li class="tocline"><a href="#organization" class="tocxref"><span class="secno">2. </span>Organization</a></li><li class="tocline"><a href="#entry-requirements" class="tocxref"><span class="secno">3. </span>Registration Entry Requirements</a></li><li class="tocline"><a href="#registry" class="tocxref"><span class="secno">4. </span>Registry</a></li><li class="tocline"><a href="#conformance" class="tocxref"><span class="secno">5. </span>Conformance</a></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">A. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">A.1 </span>Normative references</a></li></ul></li></ul></section>
<section id="purpose" typeof="bibo:Chapter" resource="#purpose" property="bibo:hasPart">
<!--OddPage--><h2 id="h-purpose" resource="#h-purpose"><span property="xhv:role" resource="xhv:heading"><span class="secno">1. </span>Purpose</span></h2>
<p>This registry is intended to enhance interoperability among implementations and users of
<code><a href="index.html#idl-def-SourceBuffer" class="idlType">SourceBuffer</a></code> objects described in the
<a href="index.html#">Media Source Extensions</a>(MSE) specification. In particular, this registry provides the means (1) to identify
and avoid MIME-type collisions among byte stream formats, and (2) to disclose information about byte stream formats accepted by MSE
implementations to promote interoperability.
</p></section>
<section id="organization" typeof="bibo:Chapter" resource="#organization" property="bibo:hasPart">
<!--OddPage--><h2 id="h-organization" resource="#h-organization"><span property="xhv:role" resource="xhv:heading"><span class="secno">2. </span>Organization</span></h2>
<p>The registry maintains a mapping between MIME-type/subtype pairs and byte stream format specifications. The byte stream format specifications describe the
structure and semantics of byte streams accepted by <code><a href="index.html#idl-def-SourceBuffer" class="idlType">SourceBuffer</a></code> objects
created with the associated MIME-type/subtype pair.</p>
<p>This registry is not intended to include any information on whether a byte stream format is encumbered by intellectual property claims. Implementors and users
are advised to seek appropriate legal counsel in this matter if they intend to implement or use a specific byte stream format.</p>
</section>
<section id="entry-requirements" typeof="bibo:Chapter" resource="#entry-requirements" property="bibo:hasPart">
<!--OddPage--><h2 id="h-entry-requirements" resource="#h-entry-requirements"><span property="xhv:role" resource="xhv:heading"><span class="secno">3. </span>Registration Entry Requirements</span></h2>
<ol>
<li>Each entry <em class="rfc2119" title="MUST">MUST</em> include a unique MIME-type/subtype pair. If the byte stream format is derived-from an existing file format, then it <em class="rfc2119" title="SHOULD">SHOULD</em> use the
MIME-type/subtype pairs typically used for the file format.</li>
<li>Each entry <em class="rfc2119" title="MUST">MUST</em> include a <var><a href="index.html#sourcebuffer-generate-timestamps-flag">generate timestamps flag</a></var> value that <em class="rfc2119" title="MUST">MUST</em> be used by
<code><a href="index.html#idl-def-SourceBuffer" class="idlType">SourceBuffer</a></code> when handling the byte stream format.</li>
<li>Each entry <em class="rfc2119" title="MUST">MUST</em> include a link that references a publically available specification. It is recommended that such a specification be made available
without cost (other than reasonable shipping and handling if not available by online means).</li>
<li>Each entry <em class="rfc2119" title="MUST">MUST</em> comply with all requirements outlined in the <a href="index.html#byte-stream-formats">byte stream formats section</a>
of the <a href="index.html#">Media Source Extensions</a> specification.</li>
<li>Candidate entries <em class="rfc2119" title="MUST">MUST</em> be announced on <a href="mailto:[email protected]">[email protected]</a>(<a href="mailto:[email protected]">subscribe</a>,
<a href="http://lists.w3.org/Archives/Public/public-html-media/">archives</a>) so they can be discussed and evaluated for compliance before being added to the
registry.</li>
</ol>
<p>If a registration fails to satisfy a mandatory requirement specified above, then it <em class="rfc2119" title="MAY">MAY</em> be removed from the registry (without prejudice).
</p></section>
<section id="registry" typeof="bibo:Chapter" resource="#registry" property="bibo:hasPart">
<!--OddPage--><h2 id="h-registry" resource="#h-registry"><span property="xhv:role" resource="xhv:heading"><span class="secno">4. </span>Registry</span></h2>
<table>
<thead>
<tr>
<th>MIME type/subtype</th>
<th>Public Specification(s)</th>
<th>Generate Timestamps Flag</th>
</tr>
</thead>
<tbody>
<tr>
<td>
audio/webm<br>
video/webm
</td>
<td><a href="webm-byte-stream-format.html">WebM Byte Stream Format</a></td>
<td>false</td>
</tr>
<tr>
<td>
audio/mp4<br>
video/mp4
</td>
<td><a href="isobmff-byte-stream-format.html">ISO BMFF Byte Stream Format</a></td>
<td>false</td>
</tr>
<tr>
<td>
audio/mp2t<br>
video/mp2t
</td>
<td><a href="mp2t-byte-stream-format.html">MPEG-2 Transport Streams Byte Stream Format</a></td>
<td>false</td>
</tr>
<tr>
<td>
audio/mpeg<br>
audio/aac
</td>
<td><a href="mpeg-audio-byte-stream-format.html">MPEG Audio Byte Stream Format</a></td>
<td>true</td>
</tr>
</tbody>
</table>
</section>
<section id="conformance" typeof="bibo:Chapter" resource="#conformance" property="bibo:hasPart"><!--OddPage--><h2 id="h-conformance" resource="#h-conformance"><span property="xhv:role" resource="xhv:heading"><span class="secno">5. </span>Conformance</span></h2>
<p>
As well as sections marked as non-normative, all authoring guidelines, diagrams, examples,
and notes in this specification are non-normative. Everything else in this specification is
normative.
</p>
<p id="respecRFC2119">The key words <em class="rfc2119" title="MAY">MAY</em>, <em class="rfc2119" title="MUST">MUST</em>, and <em class="rfc2119" title="SHOULD">SHOULD</em> are
to be interpreted as described in [<cite><a class="bibref" href="#bib-RFC2119">RFC2119</a></cite>].
</p>
</section>
<section id="references" class="appendix" typeof="bibo:Chapter" resource="#references" property="bibo:hasPart"><!--OddPage--><h2 id="h-references" resource="#h-references"><span property="xhv:role" resource="xhv:heading"><span class="secno">A. </span>References</span></h2><section id="normative-references" typeof="bibo:Chapter" resource="#normative-references" property="bibo:hasPart"><h3 id="h-normative-references" resource="#h-normative-references"><span property="xhv:role" resource="xhv:heading"><span class="secno">A.1 </span>Normative references</span></h3><dl class="bibliography" resource=""><dt id="bib-RFC2119">[RFC2119]</dt><dd>S. Bradner. <a href="https://tools.ietf.org/html/rfc2119" property="dc:requires"><cite>Key words for use in RFCs to Indicate Requirement Levels</cite></a>. March 1997. Best Current Practice. URL: <a href="https://tools.ietf.org/html/rfc2119" property="dc:requires">https://tools.ietf.org/html/rfc2119</a>
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