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docs(video): document timestamped contact sheets

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Xiangzhe
2026-08-18 02:08:34 -03:00
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docs/security/GUARDRAILS.md
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@@ -331,6 +331,12 @@ compared only with the last frame retained. The first and final timeline frames
are always retained; comparator or decoder errors fail open and keep coverage.
The output metadata reports how many frames were dropped.
An explicitly marked video part may request a timestamped contact sheet. The
bridge builds at most a 4-column, 16-frame JPEG grid and labels the resulting
observation with every source timestamp. If `sharp` cannot decode or compose
the grid, the bridge falls back to the individual JPEG frames; a client abort
still propagates through the sheet operation.
Callers may attach an optional `transcript.cues` array to a supported video
part when they already possess aligned text. Each cue must carry `text`, a
finite `start`/`end` interval inside the probed duration, and a whitelisted