Plan 01-08 Task 5 closeout. The post-B+ smoke run produced a working
single-EBML WebM (28.76s, 676 frames, 1.89 MB, monotonic 0→28.76s
timestamps). Operator-confirmed empirically (timer overlay in smoke
HTML showed the latest frames matched expectations).
Two-fixture split resolves a test-design conflict surfaced when
last_30sec.webm flipped from pre-remux input shape to post-remux
output shape:
- tests/fixtures/last_30sec.webm — POST-REMUX output (single EBML,
41 ffmpeg dry-run lines). Validates webm-playback.test.ts'
playable-duration + structural assertions.
- tests/fixtures/raw-3ebml-concat.webm — PRE-REMUX input (3-EBML
concat, 299 ffmpeg dry-run lines = 3 segment boundaries).
Preserved from the original 2026-05-15 Phase 1 closure fixture.
Used by webm-remux.test.ts to test that remuxSegments correctly
transforms 3-EBML input → single-EBML output.
tests/background/webm-remux.test.ts FIXTURE_PATH updated to point at
raw-3ebml-concat.webm; the hardcoded EBML byte offsets [0, 509038,
970967] and frame bounds [905, 912] remain valid against that
preserved input.
Result: 64/64 vitest GREEN (was 61/64). tsc clean. Build exit 0.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Replaces the stale fixture committed in 87909d9 (test(fix-a3): commit
debug-session test artifacts + stale fixture) — that one was captured
under the D-09..D-11 single-continuous-recorder lifecycle and froze
~1 s into playback per the resolved A3 cluster-alignment session.
This fresh fixture (1.6 MB, VP9 1142×1038) was produced by ./smoke.sh
against the D-13 restart-segments recorder (commits 5530292..872f25d):
three self-contained 10 s WebM segments concatenated by the SW into a
multi-EBML-header file the operator confirmed plays cleanly in Chrome.
Acceptance evidence:
- ffprobe -v error -f matroska -i tests/fixtures/last_30sec.webm → exit 0
- ffmpeg -v warning -i tests/fixtures/last_30sec.webm -f null - → exit 0
with zero decoder errors; only the expected muxer DTS-monotonicity
warnings at segment join boundaries (non-blocking — multi-EBML-header
concat is the documented D-13 trade-off)
- Operator confirmed end-to-end Chrome playback clean (no ~1 s freeze)
- All 30/30 unit tests green incl. empirical webm-playback.test.ts gate
This closes the D-12 + A3 acceptance gates referenced in:
- .planning/debug/resolved/d12-blob-port-transfer-fails.md
- .planning/debug/resolved/webm-playback-freeze.md
Captures the RED contracts that the webm-playback-freeze debug
session landed (before this fix-a3 cycle started) plus the original
Plan 07 smoke fixture they run against. None of these files were
modified by this fix cycle — they are landed as-is from the debug
session to make the test history bisectable.
Files staged:
- tests/offscreen/segment-keyframes.test.ts
Three describe blocks (~340 LOC):
* documentation — pure-simulation tests that pin the D-09..D-11
failure mode as executable evidence (regression guard against
re-introducing single-continuous-recorder semantics)
* GREEN-pinning — pure-simulation tests that pin the D-13
segment-keyframe invariant
* production-driven — imports src/offscreen/recorder.ts and
asserts (i) `getSegments` exported as a function, (ii) it
returns at most 3 Blobs. THIS BLOCK IS NOW GREEN after the
D-13 activation in the prior commits — was the genuine TDD
anchor for fix-a3.
- tests/offscreen/webm-playback.test.ts
Two empirical-ffmpeg assertions on tests/fixtures/last_30sec.webm:
* zero "Error submitting packet to decoder" lines from the
VP9 decoder
* no "File ended prematurely" container-finalization error
Both STAY RED in this commit because the committed fixture is
still the stale one from Plan 07's pre-fix smoke. They flip
GREEN after the operator runs ./smoke.sh to regenerate the
fixture against the D-13 recorder — see the closing message
and the NEXT-STEP block of the resolved debug session.
- tests/fixtures/last_30sec.webm
The 2.1 MB Plan 07 smoke artifact. Committed deliberately so
the empirical RED test has something to run against. Will be
overwritten by the next ./smoke.sh run (single-file rotation —
the path is fixed by the smoke script + zip extraction step
in the debug-session reproduction).
Verification:
- npx vitest run --reporter=dot → Tests 2 failed | 28 passed (30)
- The 2 fails are EXACTLY the two empirical-ffmpeg assertions in
webm-playback.test.ts; the structural production-driven block
in segment-keyframes.test.ts is fully GREEN.
- npx tsc --noEmit clean.
- npm run build succeeds.
Operator action required before Phase 1 close (Plan 07 still owns
REQ-video-ring-buffer): re-run ./smoke.sh per the documented
6-step reproduction in the debug session, then re-run
`npx vitest run tests/offscreen/webm-playback.test.ts` and
expect both assertions to flip GREEN. Plan 07 success criterion
§10 #7 (playback) lands at that point.
Four RED tests pin D-10 (header pinning) and D-11 (30s trim) contracts:
- 'first chunk is header' — isFirst marker on first addChunk
- 'second chunk is NOT header' — only the first is pinned
- 'trim 30s — keeps header, evicts aged tail' — header survives indefinitely
- 'trim with empty buffer does not throw' — defensive edge case
Plan 03 must export {addChunk, trimAged, getBuffer, resetBuffer} from
src/offscreen/recorder.ts to flip these to GREEN.
Also stages tests/fixtures/.gitkeep so the fixture dir survives clean
checkouts (Plan 07 drops a known-good last_30sec.webm into it after the
manual smoke test).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
