August 3rd, 2020
The Timed Text Working Group has published TTML Profiles for Internet Media Subtitles and Captions 1.2 as a W3C Recommendation. IMSC 1.2 is the latest version of the IMSC standard, which defines profiles of the Timed Text Markup Language for worldwide subtitling and captioning interchange. IMSC is used in applications such as CMAF, DASH, IMF, ATSC, DVB, etc. and is designed to work with SMPTE-TT, EBU-TT-D, and other regional practices. IMSC 1.2 adds support for downloadable font resources. This feature is intended to improve fidelity by providing clients the exact font used during authoring and allow images to be added to inline text content – while providing graceful fallback. IMSC 1.2 is otherwise primarily a maintenance release that fixes outstanding bugs and generally improves specification text.