WebVTT Specification Repository

Description

W3C's WebVTT specification source and issue tracker, providing normative format semantics for caption parsing, rendering, cue timing, and interoperability implementations.

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Related resources

• EBU Tech 3380: EBU-TT-D SpecificationOfficial EBU technical specification document for EBU-TT-D subtitle/caption distribution format.
• EBU-TT-DEBU project repository for EBU-TT-D, the timed-text subtitle format used in broadcast workflows; provides implementation resources for auth…
• 608toVTT Conversion NoteW3C technical note on best practices for converting CEA-608/708 caption features into WebVTT.
• TTML Live Extensions ModuleW3C spec for live TTML/EBU-TT-Live subtitle streaming extensions, niche companion to IMSC.
• W3C IMSC Test SuiteOfficial IMSC1 conformance test suite; several tests double as EBU-TT-D conformance tests.
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• MPEG Basics (Chiariglione)Explanation of MPEG standardization process and organizational structure by MPEG founder Leonardo Chiariglione.
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• ITU-T Recommendation P.1204Official ITU-T recommendation page for P.1204 bitstream-based video quality models covering resolutions up to UHD, the specification behind…
• rt-dvb-i-service-list-registry5G-MAG reference service-list registry that answers DVB-I client queries with entry points per ETSI TS 103 770.
• DVB-I Reference CSROfficial DVB Project reference Central Service Registry so DVB-I clients can discover service lists.
• NMOS-ReferencePython reference NMOS node and registry, plus a companion high-performance Rust NMOS registry for AMWA IS-04/IS-05.