Tt/Timed Text Efforts
From Web and TV IG
WebVTT-based efforts and specifications
TTML-based efforts and specifications
- SMPTE ST 2052-1 aka SMPTE-TT (https://www.smpte.org/sites/default/files/st2052-1-2010.pdf)
- developed by SMPTE (http://smpte.org)
- worldwide text- and image-based captions
- CFF-TT (latest published version at http://uvvu.com/docs/public/tspec/CFFMediaFormat-1.0.5.pdf)
- based on SMPTE TT (ST 2052-1)
- developed by DECE (http://uvvu.com)
- worldwide text- and image-based captions and subtitles
- TTML Simple Delivery Profile for US Captions (http://www.w3.org/TR/ttml10-sdp-us/)
- developed by the W3C TTML WG
- intended to be a subset of CFF-TT
