W3C

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2018-11-08 Recommendation

Timed Text Markup Language 1 (TTML1) (Third 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.

2018-11-08 Recommendation

Timed Text Markup Language 2 (TTML2)

The Timed Text Markup Language is a content type that represents timed text media for the purpose of interchange among authoring systems and for distribution for example as a format to reference from an HTML element. Timed text is textual information that is intrinsically or extrinsically associated with timing information.