Timed Text refers to the presentation of text media in synchrony with other media, such as audio and video.Typical applications of timed text are the real time subtitling of foreign-language movies on the Web, captioning for people lacking audio devices or having hearing impairments, karaoke, scrolling news items or teleprompter applications.
Timed text for MPEG-4 movies and cellphone media is specified in MPEG-4 Part 17, and is also referred to by RFC 3839.
The W3C is developing a Timed Text (TT) specification that covers many aspects of timed
W3C has published a First Public Working Draft for Timed Text (TT) Authoring Format 1.0 — Distribution Format Exchange Profile (DFXP). The draft has been produced by members of the Timed Text (TT) Working Group as part of the W3C Synchronized Multimedia Activity.
The W3C Timed Text Working Group was chartered in January 2003 to "develop an XML-based format used for the representation of streamed text synchronized with other timed media, like audio and video. A typical application is real time captioning of movies on the Web (e.g., integrated in
* No standard method for displaying text synchronized with other media.
* Need for a standard Timed Text format synchronized with some other timed media.
Timed Text applications
* Subtitles of movies on the Web (foreign languages)
* Captions for people lacking audio devices or having hearing disabilities
* Karaoke
* Scrolling news, credits rolls
* TickerTape, marquee, "crawls"
* Text overlay
* TelePrompter
SMIL Interoperability
* Good interoperability on synchronization level
* Not so good interoperability for media
o Text: Plain
The Timed-Text specification should covers all necessary aspects of timed text on the Web. Typical applications of timed text are the real time subtitling of foreign-language movies on the Web, captioning for people lacking audio devices or having hearing impairments, karaoke, scrolling news items or teleprompter applications.
The issue of developing an interoperable timed text format came up during the development of the SMIL 2.0 specification. Today, there are a number of incompatible formats for captioning, subtitling and other forms of timed text
W3C has announced the creation of a new Timed Text Working Group (TTWG) as part of the Synchronized Multimedia Activity (SYMM). The mission of the Timed Text Working Group is to develop an XML based format used for the representation of streamable text synchronized with some other timed media, like audio and video. Working Group members envision that the Timed Text specification will cover "all necessary aspects of timed text on the Web. Typical applications of timed text are the real time subtitling of foreign-language movies on the Web, captioning for
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