Method

Video captions present

Closed captions (CEA-608 / 708) presence

What we measure and how

Closed-caption presence detection covers the two canonical container shapes captioned masters arrive in. (1) **A/53 SEI in the video bitstream** — H.264 / HEVC user-data following the CEA-708 framing specified by ATSC A/53 Part 4, surfaced on the `closed_captions` stream-level flag and used for the OTT / broadcast delivery shape. (2) **Stream-level caption track** — a separate stream in a MOV / MP4 container with codec tag `c608`, `c708`, or `clcp` per the Apple QuickTime File Format specification, which is how Premiere / Resolve / Avid emit captions on ProRes masters. Presence in either shape passes the check. SMPTE-436M ancillary data in MXF containers is not yet covered.

Provenance

Standards

CEA-608 · CEA-708 · Apple QuickTime File Format

Spec fields consulted

These Universal Media Delivery Profile paths resolve this check's thresholds against your spec snapshot at the moment the job was submitted.

• · assets.video.captions.required

The full UMDP schema: /umdp.

Method identifier: video_captions_present