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= Efforts (Including Implementations) and Specifications, Guides, and other Documentation =
[[Category:TTML]]

== WebVTT-based efforts and specifications ==

* Specification (http://dev.w3.org/html5/webvtt/), Latest published version; https://www.w3.org/TR/webvtt1/ 
* Documentation
** VTT Authoring, was on WebPlatform Docs (http://docs.webplatform.org/wiki/concepts/VTT_Captioning) and now on the [https://www.w3.org/wiki/VTT_Concepts Wiki]
** Getting Started With the Track Element (http://www.html5rocks.com/en/tutorials/track/basics/)
** Introduction to WebVTT and <track> (http://dev.opera.com/articles/view/an-introduction-to-webvtt-and-track/)
** WebVTT and captioning on the web (http://www.accessiq.org/news/features/2013/03/webvtt-and-captioning-on-the-web)
** WebVTT in WebM (http://wiki.webmproject.org/webm-metadata/temporal-metadata/webvtt-in-webm)
** WebVTT and TTML in MP4 (ISO/IEC 14496-30). The reference software for MP4 may be requested from the [http://www.mp4ra.org MP4 Registration Authority].
** 608/708 mapping (https://dvcs.w3.org/hg/text-tracks/raw-file/669f6b95a488/608toVTT/608toVTT.html)
** WebVTT in Apple’s HTTP Live Streaming (http://tools.ietf.org/html/draft-pantos-http-live-streaming-11)

* Implementations
** Other pointers include [http://caniuse.com/#feat=webvtt CanIUse], [http://en.wikipedia.org/wiki/WebVTT Wikipedia], and the [http://www.jwplayer.com/html5/webvtt/ JWPlayer] pages.
** IE 10: http://ie.microsoft.com/testdrive/Graphics/VideoCaptions/Default.html
** Chrome: http://www.iandevlin.com/blog/2012/06/html5/google-chrome-supports-webvtt-subtitles
** Opera: my.opera.com/desktopteam/blog/2012/08/03/summer-core-update
** Firefox: making progress https://bugzilla.mozilla.org/show_bug.cgi?id=629350
** [https://developer.apple.com/library/iad/releasenotes/General/WhatsNewInSafari/Articles/Safari_7_0.html Safari]
** Other implementations include:
*** [http://knowledge.kaltura.com/webvtt-and-hls-captions-support Kaltura] 
*** [https://github.com/pculture/babelsubs BabelSubs]
*** [http://www.leanbackplayer.com LeanBack Player]
*** [http://www.slideshare.net/cconcolato/m30301-report-on-web-vtt-implementation GPAC media engine]
*** [http://blog.videojs.com/post/35883671470/version-3-2-update Video.js]
*** [http://support.jwplayer.com/customer/portal/articles/1407438-adding-closed-captions JWplayer]
*** [http://docs.brightcove.com/en/perform/brightcove-player/guides/adding-captions-to-videos.html Brightcove]
*** [http://www.wowza.com/forums/content.php?498-How-to-stream-WebVTT-subtitles-to-iOS-for-closed-captioning Wowza]
*** [http://blog.zencoder.com/2012/07/13/closed-captioning-for-web-mobile-and-tv/ Zencoder]
*** [http://mediaelementjs.com MediaElement.js]
*** [http://ableplayer.github.io/ableplayer/ Able Player]
*** [http://yendifplayer.com/subtitle-your-video.html YendifPlayer]
*** There is support outside the browser in Apple [https://developer.apple.com/streaming/ HTTP Live Streaming (HLS)].
* There is more reporting on implementation on the [https://www.w3.org/community/texttracks/2012/08/23/webvtt-support-in-browsers/ Community Group pages], and on [https://docs.webplatform.org/wiki/concepts/VTT_Captioning WebPlatform Docs].

* Caption authoring software/services that support WebVTT
** [http://www.mediacore.com/blog/meet-the-new-media-uploader MediaCore]
** [http://www.3playmedia.com/how-it-works/how-to-guides/html5-video-captioning/ 3plymedia]
** [http://www.cpcweb.com/webcasts/webcast_samples.htm CPC]
** [http://www.telestream.net/captioning/compare.htm Telestream]
** [https://msdn.microsoft.com/library/jj152136(v=vs.85).aspx MS CaptionMaker]
** [http://captiongenerator.com/ CaptionGenerator]
** [http://captionsmaker.com/ CaptionsMaker] (for YouTube videos)

* JavaScript polyfills for backwards compatibility (http://www.w3.org/community/texttracks/2012/08/23/webvtt-support-in-browsers/)

* Validator (http://quuz.org/webvtt/)
* [https://github.com/annevk/webvtt Parser/validator] from Anne, for which Silvia added [https://github.com/silviapfeiffer/WebVTT-with-regions region support].

* Test cases (https://github.com/w3c/web-platform-tests/tree/master/webvtt and results at https://wpt.fyi/webvtt)

== TTML-based efforts and specifications ==

=== Specification ===

* TTML1 (http://www.w3.org/TR/ttml1/)
* TTML2 (http://www.w3.org/TR/ttml2/)
* IMSC 1 (https://www.w3.org/TR/ttml-imsc1/)
* IMSC 1.0.1 (https://www.w3.org/TR/ttml-imsc1.0.1/)
* IMSC 1.1 (https://www.w3.org/TR/ttml-imsc1.1/)
* IMSC 1.2 (https://www.w3.org/TR/ttml-imsc1.2/)
* IMSC 1.3 (https://www.w3.org/TR/ttml-imsc1.3/)
* IMSC-HRM (https://www.w3.org/TR/imsc-hrm/)
* DAPT (https://www.w3.org/TR/dapt/)

=== Documentation ===

* Presentation on EBU-TT-D and IMSC 1 from IBC 2015 (https://tech.ebu.ch/files/live/sites/tech/files/shared/events/IBC2015/EBU-TT-D_and_IMSC.pdf)
* BBC Subtitle Guidelines describing BBC UK editorial guidelines and how they can be achieved in TTML (https://www.bbc.co.uk/accessibility/forproducts/guides/subtitles)
* Mapping TTML style attributes to CSS ([[TimedText/CSSRequirements|CSS Requirements wiki]])

=== Profiles and flavours ===

* [https://www.w3.org/TR/ttml-imsc1.0.1/ TTML Profiles for Internet Media Subtitles and Captions 1.0.1 (IMSC1)] is intended to bring together popular profiles of TTML1, including:
** [http://www.w3.org/TR/ttml10-sdp-us/ TTML Simple Delivery Profile for US Captions]
** [https://tech.ebu.ch/publications/tech3380 EBU-TT-D Tech 3380]
** [http://www.uvcentral.com/sites/default/files/files/PublicSpecs/CFFMediaFormat-2_2.pdf CFF-TT]
** [https://www.smpte.org/sites/default/files/st2052-1-2010.pdf SMPTE ST 2052-1 aka SMPTE-TT]

* [https://www.w3.org/TR/ttml-imsc1.1/ TTML Profiles for Internet Media Subtitles and Captions 1.1] extends IMSC 1, adding support for HDR, improved metadata, and more global script layout requirements such as ruby and text emphasis.

* [https://www.w3.org/TR/ttml-imsc1.2/ TTML Profiles for Internet Media Subtitles and Captions 1.2] extends IMSC 1.1, adding support for external font resources.

* [https://w3c.github.io/dapt/ Dubbing and Audio Description Profile of TTML2 (DAPT)] is a profile of TTML2 to support the authoring, exchange, recording and playback of dubbing and audio description
** [https://www.w3.org/TR/dapt-reqs/ DAPT Requirements] defines the requirements that the DAPT specification needs to meet

* SMPTE ST 2052-1 aka SMPTE-TT (https://www.smpte.org/sites/default/files/st2052-1-2010.pdf)
** developed by SMPTE (http://smpte.org)
** worldwide text- and image-based captions
** mapping from CEA 608 to SMPTE-TT (https://www.smpte.org/sites/default/files/rp2052-10-2012.pdf)
** mapping from CEA 708 to SMPTE-TT (upcoming)

* CFF-TT (latest published version at ttp://www.uvcentral.com/sites/default/files/files/PublicSpecs/CFFMediaFormat-2_2.pdf)
** based on SMPTE TT (ST 2052-1)
** developed by DECE (http://uvvu.com)
** worldwide text- and image-based captions and subtitles

* TTML Simple Delivery Profile for US Captions (http://www.w3.org/TR/ttml10-sdp-us/)
** developed by the W3C TTML WG
** intended to be a subset of CFF-TT

* EBU-TT (http://tech.ebu.ch/ebu-tt)
** EBU-TT Part 1 Tech 3350 (https://tech.ebu.ch/publications/tech3350)
** EBU-TT-D Tech 3380 (https://tech.ebu.ch/publications/tech3380)
** EBU-TT Part 3 Tech 3370 (https://tech.ebu.ch/publications/tech3370)

* CEA (http://www.ce.org/)
** Closed Captioning in IP-delivered Video Programming (http://www.ce.org/Standards/Standard-Listings/R4-3-Television-Data-Systems-Subcommittee/CEA-TR-3.aspx

* YouView (https://industry.youview.com/resources/YouView_Core_Technical_Specification_1.0.pdf#page=118)

=== Wrappers and packaging mechanisms ===

* Timed Text in MPEG 2 Transport Stream  - DVB-TTML, EN-303 560 (https://www.etsi.org/deliver/etsi_en/303500_303599/303560/01.01.01_60/en_303560v010101p.pdf)

* Timed Text in MPEG 4 (http://mpeg.chiariglione.org/standards/mpeg-4/timed-text-and-other-visual-overlays-iso-base-media-file-format)

* TTML and WebVTT in MP4 (ISO/IEC 14496-30)
** EBU-TT-D Carriage in ISO BMFF Tech 3381 (https://tech.ebu.ch/publications/tech3381)

* RTP Payload for Timed Text Markup Language (TTML) (https://datatracker.ietf.org/doc/html/rfc8759)

* SMPTE 2110-43 "Professional Media Over Managed IP Networks: Timed Text Markup Language for Captions and Subtitles" (https://pub.smpte.org/pub/st2110-43/st2110-43-2021.pdf)

=== Implementations ===
* ttconv - Library for converting between subtitle and caption formats. Supports WebVTT, SRT, TTML, EBU STL, CEA 608... (https://github.com/sandflow/ttconv)
* imscHRM - implementation of the IMSC Hypothetical Render Model (HRM) to constraint IMSC document complexity (https://github.com/sandflow/imscHRM)
* imscJS - IMSC1 polyfill for HTML5 + JS (https://github.com/sandflow/imscJS)
* Samsung SUHD JS 9 Series Prototype TV supporting EBU-TT-D for live and on demand HbbTV2.0 DASH streaming services. 
* dash.js (https://github.com/Dash-Industry-Forum/dash.js/wiki)
* BBC gstreamer plugin (https://github.com/bbc/gst-ttml-subtitles)
* TTML validator on line (http://www.skynav.com:8080/ttv/verify). Source available at https://github.com/skynav/ttt/. Sample web app at https://imscv.sandflow.com/.
* EBU-TT Live Interoperability Toolkit (http://ebu.github.io/ebu-tt-live-toolkit/)
* Adhere - BBC implementation of client-side audio description mixing in the browser, using an open source BBC library adhere-lib (https://bbc.github.io/Adhere/)

See the [[TimedText/IMSC1_implementation_page|IMSC1 Implementation Page]] for IMSC1-specific implementation information.

Originally copied from [http://www.w3.org/2011/webtv/wiki/Tt/Timed_Text_Efforts Timed Text Efforts], and further modified