W3C

Timed Text Current Status

This page summarizes the relationships among specifications, whether they are finished standards or drafts. Below, each title links to the most recent version of a document.

Completed Work

W3C Recommendations have been reviewed by W3C Members, by software developers, and by other W3C groups and interested parties, and are endorsed by the Director as Web Standards. Learn more about the W3C Recommendation Track.

Group Notes are not standards and do not have the same level of W3C endorsement.

Standards

2013-09-24

Timed Text Markup Language 1 (TTML1) (Second Edition)

This document specifies the distribution format exchange profile (DFXP) of the timed text authoring format (TT AF) in terms of a vocabulary and semantics thereof.

The timed text authoring format is a content type that represents timed text media for the purpose of interchange among authoring systems. Timed text is textual information that is intrinsically or extrinsically associated with timing information.

The Distribution Format Exchange Profile is intended to be used for the purpose of transcoding or exchanging timed text information among legacy distribution content formats presently in use for subtitling and captioning functions.

In addition to being used for interchange among legacy distribution content formats, DFXP content may be used directly as a distribution format, for example, providing a standard content format to reference from a <text> or <textstream> media object element in a [SMIL 2.1] document.

Group Notes

2013-02-05

TTML Simple Delivery Profile for Closed Captions (US)

The Simple Online Delivery profile is focused on streamlined delivery of closed captions on the Internet, supporting core TTML features to deliver content originating legacy formats such as CEA-608 and -708 content, and is targeted primarily for delivery in US markets.

2006-04-27

Timed Text (TT) Authoring Format 1.0 Use Cases and Requirements

This document specifies usage scenarios and requirements for a timed text authoring format. A timed text authoring format is a content type that represents timed text media for the purpose of interchange among authoring systems. Timed text is textual information that is intrinsically or extrinsically associated with timing information.

Drafts

Below are draft documents: other Working Drafts . Some of these may become Web Standards through the W3C Recommendation Track process. Others may be published as Group Notes or become obsolete specifications.

Other Working Drafts

2014-09-30

TTML Text and Image Profiles for Internet Media Subtitles and Captions 1.0

This document specifies two profiles of [TTML1]: a text-only profile and an image-only profile. These profiles are intended to be used across subtitle and caption delivery applications worldwide, thereby simplifying interoperability, consistent rendering and conversion to other subtitling and captioning formats. The text profile is a superset of [SDPUS]. Both profiles are based on [SUBM].

2014-08-14

Media Accessibility User Requirements

Aggregates requirements of a user with disabilities with respect to audio and video on the Web, providing background on user needs, alternative content technologies, and their application on the Web.