The Timed Text Working Group of the World Wide Web Consortium (W3C) has reached a significant milestone in accessibility and media localization standards. The group has officially published the DAPT Requirements as a Group Note , marking a major step forward in standardizing timed text workflows for dubbing and audio description. What is DAPT? DAPT stands for Dubbing and Audio description Profile of TTML2 . It is a specialized profile of TTML2 (Timed Text Markup Language 2) designed to support workflows involving: Dubbing : The process of replacing the original dialogue in a film or video with localized dialogue. Audio description : Narration that describes visual elements for the benefit of blind or visually impaired viewers. The DAPT profile defines technical requirements necessary for efficiently synchronizing and managing timed text in these accessibility and localization workflows. A Brief Timeline May 2022 : The first draft of the DAPT Requirements was published ...

The  Timed Text Working Group  has published  Dubbing and Audio description Profiles of TTML2  as a W3C Candidate Recommendation. This document defines DAPT, a TTML-based file format for the exchange of timed text content in dubbing and audio description workflows. 

The  Timed Text Working Group  has published a Candidate Recommendation of  TTML Profiles for Internet Media Subtitles and Captions 1.2 . This specification defines two profiles of [ ttml2 ]: 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. This specification improves on [ ttml-imsc1.1 ] by supporting contemporary practices, while retaining compatibility with [ttml-imsc1.1] documents. It provides one new feature, which permits external font files to be referenced explicitly. One existing feature has been clarified, and no features have been deprecated in this version.

The  Timed Text Working Group  invites implementations of an updated  Timed Text Markup Language 2 (TTML2) Candidate Recommendation. This document specifies the Timed Text Markup Language (TTML), Version 2, also known as TTML2, in terms of a vocabulary and semantics thereof. The Timed Text Markup Language 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.