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Timed Text


This is the Wiki for the activities associated with the updating of the Timed Text publications.

The Timed Text Markup Language (TTML) is a markup format language for creating captioning, subtitling and similar timed presentation of text.

TTML Pages

TTML Issues

Issues are tracked.

Issues that need further elaboration can be documented and discussed by adding a page link here.

  • Issue 151 Clarify syncbase in SMPTE continuous mode

TTML Documentation

You can help by providing Timed Text Documentation.

TTML Working Group Activities

The TTML Working group home page.

TTML Working Group F2F meeting

Role Registry

The TTML specification allows users to define and use roles for elements, in order to manage this across disparate organisations (without resorting to using complex namespaced prefixes) we have started a Role Registry

Change Proposals

As we look to creating the next version of the specification to address open issues we will adopt a lightweight change proposal mechanism. These change proposals are recorded in the Change Proposal Index