Captions, subtitles & timed text · Working
IMSC
Also called: Internet Media Subtitles and Captions
ELI5
A subtitle and caption file standard designed to work across different delivery systems.
Used in conversation
“The broadcaster wants the subtitle file delivered as IMSC.”
Definition
A profile of TTML designed for interoperable subtitle and caption delivery.
Here “IMSC” means: A profile of TTML designed for interoperable subtitle and caption delivery.
Pitch context
You may encounter “IMSC” in accessibility, localisation, ethics & ai conversations or materials.
Why it matters: Explains access, language adaptation, care, provenance and emerging synthetic-media responsibilities.
Sources & evidence · 8
Supporting source families. This entry is an editorial synthesis rather than a quotation from one canonical glossary.
- World Wide Web Consortium — Making Audio and Video Media AccessibleSupporting source family · primary · checked 2026-08-14
- Netflix — Partner Help Center Delivery SpecificationsSupporting source family · primary · checked 2026-08-14
- Coalition for Content Provenance and Authenticity — C2PA Technical Specification and Content CredentialsSupporting source family · primary · checked 2026-08-14
- SAG-AFTRA — Artificial Intelligence ResourcesSupporting source family · primary · checked 2026-08-14
- U.S. Copyright Office — Copyright and Artificial IntelligenceSupporting source family · primary · checked 2026-08-14
- Writers Guild of America West — Artificial Intelligence: Know Your RightsSupporting source family · primary · checked 2026-08-14
- Coalition for Content Provenance and Authenticity — C2PA Technical SpecificationSupporting source family · primary · checked 2026-08-14
- Coalition for Content Provenance and Authenticity — C2PA Conformance ProgramSupporting source family · primary · checked 2026-08-14