bbc/ttml-validator
Description
Validates TTML documents against constraint sets including BBC Subtitle Guidelines, IMSC Text, EBU-TT-D, and DAPT profiles.
Resource details
- Category path
- Standards & Industry›Closed Captioning & Subtitling Standards
- Classification
- Not yet classified
bbc/ttml-validator is cataloged in Standards & Industry and Closed Captioning & Subtitling Standards.
URL
Related resources
- IMSC 1.2 — TTML Profiles for Internet Media Subtitles and CaptionsLatest stable W3C spec text for IMSC 1.2, the base standard behind most subtitle delivery in streaming.
- TTML Live Extensions ModuleW3C spec for live TTML/EBU-TT-Live subtitle streaming extensions, niche companion to IMSC.
- Netflix Timed Text Style GuidesNetflix's official hub of subtitle/caption style guide requirements and per-language templates, an industry-standard captioning reference.
- SMPTE ST 2052-1:2010 Timed Text FormatFree official SMPTE-TT specification for FCC safe-harbor caption/subtitle interchange, full PDF.
- 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.
- Disney Dolby Vision Best Practices Guide v1.3.1Official Disney mastering spec detailing Dolby Vision L0/L1/L2/L5/L6/L8 metadata layers and trim requirements per content type.
- Video Coding Experts Group (VCEG)Overview of ITU-T's Video Coding Experts Group and its joint work with MPEG (JVET) developing codecs beyond VVC.
- Dolby Vision Overview (Technical PDF)Vendor-style technical overview of Dolby Vision mastering workflow covering PQ grading, CMU, and trim metadata.
- HbbTV Reference ApplicationMIT-licensed reference DASH player with PlayReady/Marlin/ClearKey test material including cbcs streams, from the official HbbTV Association.
- Netflix Dolby Vision HDR Mastering GuidelinesOfficial Netflix delivery specification for Dolby Vision mastering, covering DV 4.0/2.9 profile requirements and IMF packaging.
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- SMPTE ST 2110 — Professional Media over Managed IP NetworksOfficial SMPTE standard page for ST 2110, the professional media-over-IP suite (2025 Emmy-winning standard with EBU and VSF).