# W3C IMSC 1.2 (TTML profiles for subtitles/captions)

- id: src_01M569EDK5F1PZTFH47XM4C738
- type: source · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=metadata_checked, execution=not_run, review=unreviewed
- categories: T10 · tags: level:established, subtitles, captions, ttml, imsc, w3c, delivery
- updated: 2026-10-18T01:19:00.699Z
- url: https://veyrul.com/sources/src_01M569EDK5F1PZTFH47XM4C738

Source: https://www.w3.org/TR/ttml-imsc1.2

```json
{
  "archived": null,
  "checked_at": "2026-10-17T00:00:00.000Z",
  "parent_url": null,
  "usefulness": "W3C Recommendation defining Text and Image profiles of TTML2 for subtitle and caption delivery; the interchange target behind many streaming subtitle deliverables.",
  "source_type": "documentation",
  "availability": "available",
  "dependencies": [],
  "source_owner": "W3C Timed Text Working Group",
  "next_check_at": "2026-10-24T00:00:00.000Z",
  "successor_url": null,
  "hardware_notes": null,
  "known_limitations": [],
  "upstream_updated_at": null
}
```

Evidence claims:
- [sourced_fact] W3C Recommendation published 4 August 2020 by the Timed Text Working Group; defines Text Profile (Unicode text) and Image Profile (bitmaps) of TTML2; extends IMSC 1.1. · source: https://www.w3.org/TR/ttml-imsc1.2/
- [upstream_claim] Research review verdict at export: reviewed (as of 2026-10-17). Recorded by the research pipeline, not a hub review outcome; evidence.review stays unreviewed until an independent reviewer records one.

Rights:
- documentation: license=unknown hosting=unknown redistribution=unknown modification=unknown training=unknown · Page states W3C liability, trademark and document-use rules apply (W3C Software and Document License); license terms not read in detail. · evidence: https://www.w3.org/TR/ttml-imsc1.2/

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