IMSC Worldwide Subtitles and Captions Convergence Pierre-Anthony - PowerPoint PPT Presentation

Mar 15, 2024 •275 likes •355 views

W3C Recommendation TTML Profiles for Internet Media Subtitles and Captions IMSC Worldwide Subtitles and Captions Convergence Pierre-Anthony Lemieux, Sandflow Consulting (pal@sandflow.com) Supported by MovieLabs TTML 2 TTML 1 CFF-TT SMPTE-TT

W3C Recommendation TTML Profiles for Internet Media Subtitles and Captions IMSC Worldwide Subtitles and Captions Convergence Pierre-Anthony Lemieux, Sandflow Consulting (pal@sandflow.com) Supported by MovieLabs
TTML 2 TTML 1 CFF-TT SMPTE-TT ARBI-TT SDP-US EBU-TT-D EBU-TT 2
TTML 2 TTML 1 CFF-TT SMPTE-TT ARBI-TT SDP-US EBU-TT-D EBU-TT IMSC 3
SMPTE-TT SMPTE ST 2052-1:2013 (initially published in 2010) Designated safe harbor format by the US Federal Communications Commission [FCC § 79.103 (c), 2012] Extends TTML with image support (@smpte:backgroundImage) and additional metadata (smpte:information) Imposes no practical constraints on TTML ▪ Poorly supported features, e.g. #clockMode-gps ▪ No constraint on document complexity 4
CFF-TT Practical profile of SMPTE-TT developed by Ultraviolet ecosystem ▪ Public specification supported by tools and vendors ▪ Based on study of studio catalog titles and CEA-608 Contributed to W3C as basis for IMSC (2013) 5
IMSC Worldwide collaboration of the W3C Timed Text Working Group (TTWG) Application of TTML for Internet subtitles and captions Reduces fragmentation by bringing together multiple profiles of TTML ▪ Superset of CFF-TT ▪ Practical application of SMPTE-TT (ST 2052-1) ▪ Superset of EBU-TT-D (Tech 3380) (developed by the EBU) ▪ Superset of SDP-US Intended to evolve with worldwide subtitle and caption requirements 6
Status IMSC 1 Recommendation [April 2016] Superseded by IMSC 1.0.1 Recommendation [April 2018] IMSC 1.1 Candidate Recommendation [May 2018] ▪ Based on TTML 2 ▪ Superset of IMSC 1.0.1 ▪ Adds support for Japanese language features, HDR presentations, stereoscopic presentations… 7

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