Closed Captioning & Subtitling Standards

Browse 31 curated closed captioning & subtitling standards resources for video development on Awesome Video.

Resources (showing 1–24 of 31)

• 608toVTT Conversion NoteW3C technical note on best practices for converting CEA-608/708 caption features into WebVTT.
• ADM-OSC — ADM object metadata over OSCOpen spec and tools mapping ADM (Audio Definition Model) object metadata onto OSC for live/broadcast immersive audio interop.
• Demuxed Podcast Ep.3: Accessibility for the FutureDemuxed podcast episode discussing captioning, screen-reader support, and accessibility standards with an SSB BART Group accessibility lead.
• EBU Tech 3350: EBU-TT Part 1 Subtitling Format DefinitionEBU's archive/interchange subtitling format definition, sibling spec to EBU-TT-D.
• EBU Tech 3380: EBU-TT-D SpecificationOfficial EBU technical specification document for EBU-TT-D subtitle/caption distribution format.
• EBU Tech 3380: EBU-TT-D Subtitling Distribution FormatEBU's TTML-based subtitling distribution format spec designed for DASH/OTT delivery.
• EBU-TT-D XSDOfficial EBU-TT-D XML Schema, validates against EBU Tech 3380 subtitle standard.
• EBU-TT-D and IMSC1 Convergence (IBC2015)EBU/W3C technical paper documenting the convergence of EBU-TT-D and IMSC1 subtitle standards.
• ETSI EN 300 743: DVB Subtitling SystemsOfficial DVB bitmap subtitling standard covering region/CLUT/object composition for broadcast PES-based subtitle delivery.
• FAB ESUB-XF Specification (EBU-STL Successor)European Subtitle Exchange Format spec mapping legacy EBU-STL (Tech 3264) into XML.
• FCC Closed Captioning Rules for TelevisionFCC guide to the four 47 CFR §79.1 caption quality standards — accurate, synchronous, complete and properly placed — plus exemptions and co…
• FCC Public Notice DA-21-469: Caption Quality Best PracticesFCC public notice detailing caption quality best practices for programmers and live captioners, including latency and accuracy expectations.
• 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.
• IMSC HRM Online ValidatorHosted web tool that validates TTML/IMSC subtitle documents against the IMSC Hypothetical Render Model, flagging documents too complex to r…
• IMSC Text Profile 1.3 (W3C)W3C specification defining the IMSC 1.3 TTML2 text profile for worldwide subtitle/caption exchange, with validation and presentation requir…
• Netflix Timed Text Style GuidesNetflix's official hub of subtitle/caption style guide requirements and per-language templates, an industry-standard captioning reference.
• SMPTE EG 43: System Implementation of CEA-708 and CEA-608 Closed CaptioningFreely available SMPTE engineering guideline explaining 608/708 caption carriage across ATSC A/53 and SCTE 20, with ST 334-1/-2 CDP mapping.
• SMPTE ST 2052-1:2010 Timed Text FormatFree official SMPTE-TT specification for FCC safe-harbor caption/subtitle interchange, full PDF.
• TTML Live Extensions ModuleW3C spec for live TTML/EBU-TT-Live subtitle streaming extensions, niche companion to IMSC.
• TTML to WebVTT Mapping (W3C)Official W3C spec repository defining mapping between TTML and WebVTT caption formats.
• W3C IMSC Test SuiteOfficial IMSC1 conformance test suite; several tests double as EBU-TT-D conformance tests.
• W3C TimedText Wiki: Efforts and Specifications IndexCommunity-maintained index mapping the lineage and relationships of TTML, IMSC, EBU-TT-D, SMPTE-TT and WebVTT along with known implementati…
• bbc/ttml-validatorValidates TTML documents against constraint sets including BBC Subtitle Guidelines, IMSC Text, EBU-TT-D, and DAPT profiles.
• ebu2srtSimple converter from EBU-TT-D to SRT subtitle format.