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Developments in the TTML WG

The Timed Text Working Group (TTWG), chaired by Sean Hayes from Microsoft, has been re-chartered to enhance the Timed Text Markup Language (TTML) standards. Recent activities include welcoming new participants, establishing liaisons with organizations such as SMPTE and EBU, and pushing forward the development of TTML 1.1. Key deliverables include a simple constrained profile for video closed captions, technical reports on TTML applications in HTML5, and updates addressing errata to comply with new regulations. The mission remains focused on improving online captioning delivery.

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Developments in the TTML WG

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  1. Developments in the TTML WG Sean Hayes - Microsoft. W3C TTWG chair

  2. Activities. • Re-chartered group • New participants – more welcome! • Liaisons - SMPTE, EBU, MPEG • SDP • Constrained profile • Second Edition • Bug fixes • TTML 1.1 • New features based on field experience • Timeline

  3. Charter • Mission of the Timed Text Working Group: • to develop W3C Recommendations for media online captioning by maintaining and developing new versions of the Timed Text Markup Language (TTML) – to Nov 2014. • Activities and deliverables • Second Edition TTML 1.0 Recommendation; • A simple constrained profile for delivery of closed captions for video content • Recommendation for a new Timed Text Markup Language (TTML) 1.1 specification to include. • A Technical Report on the application of TTML in HTML5 • Description of TTML intermediate synchronic document as HTML5. • Description of TTML presentation syntax and semantics relating to CSS3. • A Technical Report on the application of TTML in live production and streaming.

  4. SDP-US • The Simple Online Delivery (US) profile is focused on streamlined delivery of closed captions on the Internet. • support core TTML features to deliver content originating from legacy formats such as CEA-608 and -708 content, • targeted primarily for delivery in US markets. • 3 guiding principles for online delivery of closed captions originated in the United States: • Promote interoperability. • Provide mandatory functionality based on a specified set of TTML features. • Constraints on usage of a specified set of TTML features. • Key input from SMPTE 24B • In time to support new FCC rules

  5. Second Edition • Fixing errata. • Clarify • timebases and SMPTE marker mode • Profile behaviour • Scrolling behaviour • Editorial cleanup and additional examples • Avoides conformance changes • Latest version: • http://dvcs.w3.org/hg/ttml/raw-file/tip/ttml10/spec/ttaf1-dfxp.html

  6. TTML 1.1 • Key agreed changes so far • Free positioned paragraphs • Named animations • Padding and margin support for centered flush left captions. • Features under consideration • Holdovers from 1.0 work • Ruby, I18n improvements, 708 mapping • Issues arising from SMPTE and EBU work. • Background images. Additional font and outline styles. • Issues for consideration: • 3D positioning. Smooth animations (e.g fade), forced display, spacing control

  7. Examples

  8. Timeline

  9. QA

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