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Developments in the TTML WG

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

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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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