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feat(record): fragment the MP4 so a crash cannot destroy the whole take

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TASK 32·4. A plain MP4 keeps its index (moov) at the end, so a power cut or a killed
process left the entire recording unreadable even though every video byte was on disk.
The record block now carries
`-movflags +frag_keyframe+empty_moov+default_base_moof`: index first, a playable
fragment flushed at every keyframe, so an interrupted take plays to the last fragment.

Record block only — the FLV stream output has no index and never gets the flags.
Rename-on-stop is untouched.

Test: `Args_RecordBlock_IsFragmentedMp4_SoACrashKeepsTheFile` asserts the flags on the
record block and their absence from the streaming block.

Not yet proven on a real interrupted take (kill ffmpeg mid-recording, play the result);
the args test is by construction.

Docs: task-32 slice 4 ticked with that caveat, TASKS row, output.md record note, HANDOFF.
verify.sh: 550 passed (mouse-injection test excluded, desktop in use), 0 warnings.
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gramps
2026-11-05 08:58:48 -08:00
parent a814bcd502
commit e37215d9c4
5 changed files with 50 additions and 4 deletions
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TASKS.md
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@@ -48,7 +48,7 @@ blocker; the smallest slice is 32·4 (fragmented MP4 on the record block).
| 55·2–3 | ☐ | Disk hygiene: delete `%TEMP%` alert clips on close + sweep at startup; low-disk guard before REC (slice 1 shipped) | [`task-55`](TASKS/task-55-disk-hygiene.md) |
| 40·A/C/D | ☐ | App Settings: active-camera picker; persist output resolution + surface transition defaults + confirm-before-End; accent consolidation | [`task-40`](TASKS/task-40-app-settings-round.md) |
| 3·20 | ☐ | RewardEvent persistence: canonical `RewardEvents` table + `superChatEvents.list` 30-day backfill (the session report and journey read it) | [`task-03`](TASKS/task-03-capture-pipeline.md) |
| 32 | ☐ | Stream resilience: blip retry → measured grace + amber "RECONNECTING" → one-click Back on air → fragmented MP4 → ingest pre-flight | [`task-32`](TASKS/task-32-stream-resilience.md) |
| 32 | 🔶 | Stream resilience: **fragmented MP4 done 2026-11-05**; remaining — blip retry → measured grace + amber "RECONNECTING" → one-click Back on air → ingest pre-flight | [`task-32`](TASKS/task-32-stream-resilience.md) |
| 33 | ☐ | Bandwidth auto step-down: pure policy over dropped-frame rate, one-way within a broadcast | [`task-33`](TASKS/task-33-bandwidth-step-down.md) |
| 34 | ☐ | Scheduled streams (Text-drawer version) | [`task-34`](TASKS/task-34-scheduled-streams.md) |
| 35 | ☐ | Scene-linked audio | [`task-35`](TASKS/task-35-scene-linked-audio.md) |