View source for Tt/Timed Text Efforts


This page has been donated to the Timed Text Working Group and updates can now be found in the [https://www.w3.org/wiki/TimedText/EffortsAndSpecifications Timed Text wiki].


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

== WebVTT-based efforts and specifications ==

* Specifications(http://dev.w3.org/html5/webvtt/)
** 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 in WebM (http://wiki.webmproject.org/webm-metadata/temporal-metadata/webvtt-in-webm)
** 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
** 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

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

* Validator (http://quuz.org/webvtt/)

== TTML-based efforts and specifications ==

* 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 http://uvvu.com/docs/public/tspec/CFFMediaFormat-1.0.5.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)

* 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)