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<!DOCTYPE html>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<title>Timed Text Working Group</title>
<link rel="stylesheet" href="https://www.w3.org/2005/10/w3cdoc.css" type="text/css"
media="screen">
<link rel="stylesheet" type="text/css" href="https://www.w3.org/Guide/pubrules-style.css">
<link rel="stylesheet" type="text/css" href="https://www.w3.org/2006/02/charter-style.css">
<style type="text/css">
ul#navbar {
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dt.spec {
font-weight: bold;
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dt.spec new {
background: yellow;
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ul.out-of-scope > li {
font-weight: bold;
}
ul.out-of-scope > li > ul > li{
font-weight: normal;
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.issue {
background: cornsilk;
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color: red;
}
footer {
font-size: small;
}
th a:link, th a:visited {
color: #FFF;
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</style>
</head>
<body>
<header id="header">
<aside>
<ul id="navbar">
<li><a href="#scope">Scope</a></li>
<li><a href="#deliverables">Deliverables</a></li>
<li><a href="#coordination">Coordination</a></li>
<li><a href="#participation">Participation</a></li>
<li><a href="#communication">Communication</a></li>
<li><a href="#decisions">Decision Policy</a></li>
<li><a href="#patentpolicy">Patent Policy</a></li>
<li><a href="#licensing">Licensing</a></li>
<li><a href="#about">About this Charter</a></li>
</ul>
</aside>
<p>
<a href="https://www.w3.org/"><img alt="W3C" height="48" src="https://www.w3.org/Icons/w3c_home" width="72" /></a>
<a class="domainlogo" title="domain:int" href="https://www.w3.org/Interaction/"><img src="https://www.w3.org/Icons/interaction" alt="Interaction Domain"></a>
</p>
</header>
<main>
<h1 id="title">Timed Text Working Group Charter</h1>
<p class="mission">The <strong>mission</strong> of the <a href="https://www.w3.org/AudioVideo/TT/">Timed
Text Working Group</a>, part of the Video in the Web Activity, is to
develop W3C Recommendations for media online captioning by developing
and maintaining new versions of the Timed Text Markup Language (TTML)
and WebVTT (Web Video Text Tracks) based on implementation experience
and interoperability feedback, and the creation of semantic mappings
between those languages.</p>
<p><a href="https://www.w3.org/2004/01/pp-impl/34314/join">Join the Timed
Text Working Group</a>.</p>
<section id="details">
<table class="summary-table">
<tbody>
<tr id="Duration">
<th rowspan="1" colspan="1">End date</th>
<td rowspan="1" colspan="1">30 March 2018</td>
</tr>
<tr>
<th rowspan="1" colspan="1">Confidentiality</th>
<td rowspan="1" colspan="1">Proceedings are <a href="https://www.w3.org/Consortium/Process/comm.html#confidentiality-levels">public</a></td>
</tr>
<tr>
<th rowspan="1" colspan="1">Initial Chairs</th>
<td rowspan="1" colspan="1">Nigel Megitt,<br>
David Singer</td>
</tr>
<tr>
<th rowspan="1" colspan="1">Initial Team Contact<br>
(FTE %: 20)</th>
<td rowspan="1" colspan="1">Philippe Le Hégaret,<br>
Thierry Michel</td>
</tr>
<tr>
<th rowspan="1" colspan="1">Usual Meeting Schedule</th>
<td rowspan="1" colspan="1">Teleconferences: Weekly for TTML, and as
needed for WebVTT<br>
Face-to-face: 1-2 per year </td>
</tr>
</tbody>
</table>
</section>
<section id='scope' class="scope">
<h2>Scope</h2>
<p>This group is chartered to develop formats used for the
representation of text synchronized with other timed media, like audio
and video. Such formats MUST be useable for online media captioning,
should be useable for described video (aka video/audio description)
and should address the <a href="https://www.w3.org/TR/media-accessibility-reqs/">Media Accessibility User Requirements</a>. Such formats MAY also be
useable for broadcast production and exchange and MUST be useable in
the context of HTML.</p>
<p>The Group will:</p>
<ol>
<li>Publish a Recommendation for a new Timed Text Markup Language
(TTML) 2 specification. In the process of producing this new
revision, the Group WILL:
<ol type='a'>
<li>Address any issues found during the development of a Simple
Delivery Profile for Closed Captions.</li>
<li>Consider for adoption features from existing formats, such as
CEA608 or CEA708, or developed by groups such as SMPTE, DECE and
EBU.</li>
<li>Seek backward compatibility with TTML 1 whenever possible.</li>
<li>Will provide a mapping with HTML5/CSS3, including describing
TTML intermediate synchronic document as HTML5 document
fragment, and understanding how the presentation syntax and
semantics relate to CSS3.</li>
<li>Should address the <a href="https://www.w3.org/TR/media-accessibility-reqs/">Media Accessibility User Requirements</a>.</li>
<li>Take into account features added to IMSC1. </li>
</ol>
</li>
<li>Publish a Recommendation for the WebVTT language, in particular
the parts that cover the syntax, semantics, and rendering of
subtitles, delivery of metadata, captions, chapter markers, and
textual audio descriptions for speech synthesis. The Group is
expected to produce annual updates for the Recommendation with
previously unspecified features.
<p>In the process of producing the specification, the Group WILL:</p>
<ol type='a'>
<li>Address any issues found in <a href="https://dvcs.w3.org/hg/text-tracks/raw-file/default/webvtt/webvtt.html">WebVTT:
The Web Video Text Tracks Format</a> produced by the Web Media
Text Tracks Community Group. Some may be deferred to future
versions. </li>
<li>Include all features that have at least two interoperable and independent implementations.</li>
<li>should address the <a href="https://www.w3.org/TR/media-accessibility-reqs/">Media Accessibility User Requirements</a>.</li>
</ol>
</li>
<li>Establish a semantic mapping between TTML and WebVTT in order to
facilitate browser implementation and market adoption. </li>
<li>Maintain a simple constrained profile for delivery of closed
captions for video content ("TTML Simple Delivery Profile for Closed Captions (US)") for TTML.</li>
<li>Maintain TTML 1.</li>
<li>Publish and maintain a Recommendation for a text and an image profile of the Timed Text Markup
Language (TTML) appropriate for worldwide subtitling applications (IMSC1),
including dialog language translation, content description, captions
for deaf and hard of hearing, etc., using <a href="https://www.w3.org/Submission/ttml-ww-profiles/">TTML
Text and Image Profiles for Internet Media Subtitles and Captions</a>
as basis. In the process of producing this profile the group WILL consider for adoption features from existing formats, such as CEA608 or CEA708, or developed by groups such as SMPTE, DECE and EBU.
<p>The Group will develop and publish a new version of IMSC that is compatible with TTML 2 and will address the concerns of backward compatibility with prior versions of IMSC.</p></li>
<li>Produce a technical report (Note) on the application of TTML in
live production and streaming such as for video content.</li>
<li>Produce other technical reports (Notes) on aspects of TTML
processing as appropriate.</li>
<li>Produce a technical report (Note) on
the <a href='https://dvcs.w3.org/hg/text-tracks/raw-file/default/608toVTT/608toVTT.html'>conversion
of CEA-608/708 data streams to WebVTT</a>.</li>
</ol>
<p>The new work is expected to be broadly available and should be
provided on a timely fashion. This charter features a tightly
constrained scope designed to ensure that the Working Group will meet
its schedule and objectives.</p>
<h3>Success Criteria</h3>
<p>The Working Group is expected to demonstrate at least two
independent and interoperable implementations of every available new feature in the
recommendations. </p>
</section>
<section id="deliverables">
<h2>Deliverables</h2>
<ul>
<li>A W3C Recommendation for a new <a href="https://github.com/w3c/ttml2/blob/master/spec/ttml2.html">
Timed Text Markup Language (TTML2)</a>
specification.</li>
<li>A W3C Recommendation for the <a href="https://github.com/w3c/webvtt/blob/gh-pages/index.html">WebVTT 1.0
specification</a>, with further revisions as needed.</li>
<li>A W3C Recommendation for <a href="https://github.com/w3c/imsc/blob/master/spec/ttml-ww-profiles.html">TTML
Profiles for Internet Media Subtitles and Captions (IMSC1)</a>.</li>
<li>A W3C Recommendation for a new version of TTML Profiles for Internet Media Subtitles and Captions (IMSC).</li>
<li>Updates to <a href="https://www.w3.org/TR/2013/REC-ttml1-20130924/">Timed
Text Markup Language 1 (TTML1) (Second Edition)</a> as needed.</li>
<li>Updates to the Working Group Note on a simple constrained profile
for delivery of closed captions for video content ("<a href="https://www.w3.org/TR/ttml10-sdp-us/">TTML
Simple Delivery Profile for Closed Captions (US)</a>").</li>
<li>Working Group Note on the mapping between TTML and WebVTT</li>
<li>Working Group Note on TTML for live production and streaming.</li>
</ul>
<section id="ig-other-deliverables">
<h3>Other Deliverables</h3>
<p>The Working Group will develop and update the test suites intended to promote
implementations of the above specification(s), solidify the features specified, and to assess
interoperability between these implementations. The Group will also
produce an implementation report for each deliverable on the Recommendation track. </p>
</section>
<section id="milestones">
<h3>Milestones</h3>
<p>The Timed Text Working Group will publish milestone plans on or linked from its <a href="https://www.w3.org/wiki/TimedText">wiki</a>.
</p>
</section>
</section>
<section id="coordination">
<h2>Coordination</h2>
<p>For all specifications, this Working Group will seek <a href="https://www.w3.org/Guide/Charter.html#horizontal-review">
horizontal review</a> for accessibility, internationalization, performance, privacy, and security with the relevant
Working and Interest Groups, and with the <a href="https://www.w3.org/2001/tag/" title="Technical Architecture Group">TAG</a>. Invitation for review
should be issued during each major standards-track document transition, including <a href="https://www.w3.org/2015/Process-20150901/#RecsWD" title="First Public Working Draft">FPWD</a> and <a href="https://www.w3.org/2015/Process-20150901/#RecsCR" title="Candidate Recommendation">CR</a>, and should be issued when major changes occur in a specification.</p>
<section id='w3c-dependencies'>
<h3>W3C Groups</h3>
<dl>
<dt>Web Platform Working Group</dt>
<dd>The HTML specification is intended to provide a semantic-level
markup language and associated semantic-level scripting APIs for
authoring accessible pages on the Web ranging from static documents
to dynamic applications. It includes media elements to present
video, audio and video text tracks and their associated APIs.</dd>
<dt><a href="https://www.w3.org/WAI/APA/">Accessible Platform Architectures (APA) Working Group</a></dt>
<dd>
The mission of the Accessible Platform Architectures Working Group (APA WG) is to ensure W3C specifications provide support for accessibility to people with disabilities.
</dd>
<dt>CSS Working Group</dt>
<dd>The work of the Working Group coordinates with this group on
presentation and layout issues.</dd>
</dl>
</section>
<section>
<h3>Liaisons with W3C Groups</h3>
<dl>
<dt>Web and TV Interest Group</dt>
<dd>The Web and TV Interest Group provides a forum for Web and TV
technical discussions, review existing work, as well as the
relationship between services on the Web and TV services, and
identifies requirements and potential solutions to ensure that the
Web will function well with TV. </dd>
<dt>Web Media Text Tracks Community Group</dt>
<dd> This group developed the first Community report for the WebVTT
format and will continue to explore new features. </dd>
<dt>Internationalization (i18n) Working Group</dt>
<dd>
The mission of the Internationalization Working Group is
to enable universal access to the World Wide Web and
provide reviews of W3C technologies for
internationalization issues.
</dd>
</dl>
</section>
<section id="external-coordination">
<h3>External Groups</h3>
<dl>
<dt>ISO/IEC JTC-1/SC-29 WG 11 Moving Picture Experts Group (MPEG)</dt>
<dd>This group is developing standards for coded representation of
digital audio and video, including MPEG-4. </dd>
<dt>Society of Motion Picture and Television Engineers (SMPTE) </dt>
<dd>This organization was founded to advance theory and development in
the motion imaging field. SMPTE produced extensions to TTML 1 that
are part of SMPTE-TT.</dd>
<dt>European Broadcasting Union (EBU)</dt>
<dd>The EBU is an association of national broadcasting organisations, facilitating the exchange of audiovisual content. The EBU has developed EBU-TT, an XML-based format for use in subtitling production and exchange, and EBU-TT-D for use in subtitle distribution, both of which are constrained and extended variants of TTML 1.</dd>
<dt>Digital Entertainment Content Ecosystem (DECE)</dt>
<dd>DECE is a consortium chartered to develop standards for the
digital distribution of premium content.</dd>
<dt><a href="http://www.dvb.org/groups/TM">DVB Project: Technical Module (DVB-TM)</a></dt>
<dd>
The DVB Project develops specifications for digital television
systems, which are turned into standards by international standards
bodies such as ETSI or CENELEC. It provides a conduit to other
relevant standardisation activities including MPEG for the purpose
of meeting the objectives of the DVB Project.</dd>
<dt><a href="http://atsc.org/">Advanced Television Systems Committee (ATSC)</a></dt>
<dd>ATSC develops standards for digital television and depends on external standards for
digital closed captioning.</dd>
<dt><a href="http://www.arib.or.jp/english/index.html">Association of Radio Industries and Businesses (ARIB)</a></dt>
<dd>ARIB develops standards relating to radiowave use in the telecommunications and broadcasting fields.</dd>
</dl>
</section>
</section>
<section id="participation" class="participation">
<h2>Participation</h2>
<p>The Working Group will function as two subgroups, one for TTML and one for WebVTT, with different schedules, and coordinate when needed. For each subgroup to be successful, it is expected to have 5
or more active participants for its duration. Effective participation
to a subgroup of the Timed Text Working Group is expected to consume one half-day per
week for each participant; one day per week for editors. The Timed
Text Working Group will allocate also the necessary resources for
building Test Suites for each specification.</p>
<p>
The group encourages questions, comments and issues on its public mailing lists and document repositories, as described in <a href='#communication'>Communication</a>.
</p>
<p>
The group also welcomes non-Members to contribute technical submissions for consideration, with the agreement from each participant to Royalty-Free licensing of those submissions under the W3C Patent Policy.
</p>
</section>
<section id="communication" class="communication">
<h2>Communication</h2>
<p id="public">
Technical discussions for this Working Group are conducted in <a href="https://www.w3.org/2015/Process-20150901/#confidentiality-levels">public</a>. Meeting minutes from teleconference and face-to-face meetings will be archived for public review, and technical discussions and issue tracking will be conducted in a manner that can be both read and written to by the general public. Working Drafts and Editor's Drafts of specifications will be developed on a public repository, and may permit direct public contribution requests.
</p>
<p>Information about the group (deliverables, participants, face-to-face
meetings, teleconferences, etc.) is available from the <a href="https://www.w3.org/AudioVideo/TT/">Timed
Text Working Group home page</a>.</p>
<p>This group primarily conducts its work on the public mailing list
[email protected] (<a href="https://lists.w3.org/Archives/Public/public-tt/">archive</a>).</p>
<p>
The group may use a Member-confidential mailing list for administrative purposes and, at the discretion of the Chairs and members of the group, for member-only discussions in special cases when a participant requests such a discussion.
</p>
</section>
<section id="decisions" class="decisions">
<h2>Decision Policy</h2>
<p>
This group will seek to make decisions through consensus and due process, per the <a href="https://www.w3.org/2015/Process-20150901/#Consensus"> W3C Process Document (section 3.3</a>). Typically, an editor or other participant makes an initial proposal, which is then refined in discussion with members of the group and other reviewers, and consensus emerges with little formal voting being required.</p>
<p>
However, if a decision is necessary for timely progress, but consensus is not achieved after careful consideration of the range of views presented, the Chairs may call for a group vote, and record a decision along with any objections (allowing for remote asynchronous participation -- using, for example, email and/or web-based survey techniques) and record a decision, along with any objections. The matter should then be considered resolved unless and until new information becomes available.
</p>
<p>
Any Decision taken is to be considered provisional for 10 working days after it has been recorded by the Chair and sent to the working group's mailing list. If no new objections are raised within that period, the decision will be closed. Decisions may be reopened by the Chair according to the Process Document if there is new information.
</p>
<p>
This charter is written in accordance with <a href="https://www.w3.org/2015/Process-20150901/#Votes">Section
3.4,
Votes</a> of the W3C Process Document and includes no voting
procedures beyond what the Process Document requires.</p>
</section>
<section class="patent">
<h2 id="patentpolicy">Patent Policy</h2>
<p>This Working Group operates under the <a href="https://www.w3.org/Consortium/Patent-Policy-20040205/">W3C
Patent
Policy</a> (5 February 2004 Version). To promote the widest adoption
of Web standards, W3C seeks to issue Recommendations that can be
implemented, according to this policy, on a Royalty-Free basis.</p>
<p>For more information about disclosure obligations for this group,
please see the <a href="https://www.w3.org/2004/01/pp-impl/">W3C
Patent Policy Implementation</a>.</p>
</section>
<section id="licensing">
<h2>Licensing</h2>
<p>This Working Group will use the <a href="https://www.w3.org/Consortium/Legal/copyright-documents">
W3C Document license</a> for TTML and IMSC specifications. For other deliverables the Working Group may choose either the <a href="https://www.w3.org/Consortium/Legal/copyright-documents">
W3C Document license</a> or the <a href="https://www.w3.org/Consortium/Legal/copyright-software">
W3C Software and Document license</a>.</p>
</section>
<section>
<h2 id="about">About this Charter</h2>
<p>This charter for the Timed Text Working Group has been created
according to <a href="https://www.w3.org/2015/Process-20150901/#GAGeneral">section
5.2</a> of the <a href="https://www.w3.org/Consortium/Process">Process
Document</a>. In the event of a conflict between this document or the
provisions of any charter and the W3C Process, the W3C Process shall
take precedence.</p>
<p>The <a href="https://www.w3.org/2014/03/timed-text-charter.html">previous
charter</a> is also available.</p>
</section>
<hr>
<address> Philippe Le Hégaret, and al. </address>
<p class="copyright">
<a href="https://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> ©2016
<a href="https://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup>
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<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>
), All Rights Reserved.
<abbr title="World Wide Web Consortium">W3C</abbr> <a href="https://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>, <a href="https://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href="https://www.w3.org/Consortium/Legal/copyright-documents">document use</a> rules apply.
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