docs(testing): log the macOS 1.9.5-rc.1 pass — fragmenting is active, but a clean stop cannot prove it - #374
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…othing The macOS half of a6795d2 had never been tested. It is active -- but the check the plan prescribed cannot see it. AVAssetWriter collapses its fragments back into a normal movie in finishWriting(), so a cleanly stopped macOS file is `ftyp mdat moov` with zero moof and no mfra: byte-for-byte the shape the plan calls the headline failure, and the same shape a pre-a6795d23 recording has. Only a take whose writer died shows mvex and ~1 moof per second. On macOS the kill test is the assertion; the clean-stop box walk is a coin flip. It also found a blocker on the way. Every app-driven recording truncates -- media stops at 4.0s, 36.0s, 15.0s while the HUD counts to 02:02, 01:30, 01:04 -- and the app then discards a take it could have kept: writer-failed (AVFoundation -11800 / -16341), no sidecars, no editor, ~530 MB of decodable video dropped across three takes. That is the #363 gap firing with nothing killed at all. The cause is narrowed by building the helper twice from the rc.1 source, one line apart. With system audio, movieFragmentInterval present fails 2/2 inside two seconds; removed, it stops cleanly 3/3 at ~40s. The row records the one thing that does not fit -- video-only, the local build outlived the shipped binary 2/2 against 0/5 -- because a report that hides its loose end invites the next person to re-run the easy half and call it settled.
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📝 WalkthroughWalkthroughThe checklist adds macOS end-to-end results for ChangesmacOS E2E validation
Estimated code review effort: 1 (Trivial) | ~2 minutes Merge Risk: ⚪ Minimal · up to This change only records documented macOS testing results and introduces no production code or runtime behavior changes. No actionable merge-blocking risk remains beyond normal checks and review. Possibly related PRs
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In `@technical-documentation/testing/manual-e2e-checklist.md`:
- Line 415: Clarify the writer-failure versus helper-kill scopes in the test
row: attribute the mvex/moof observations to the specific shipped-build
writer-failure samples and the surviving-helper kill sample, including the
shipped kill’s 0-moof result. Replace “A/B isolates it” with wording that the
helper A/B test narrows the failure to writer.movieFragmentInterval for the
system-audio path, while preserving that the video-only local-versus-shipped
discrepancy remains unresolved.
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technical-documentation/testing/manual-e2e-checklist.md
…rror dialog' claim Six takes made by hand on the same machine separate the trigger that my automated runs could not: system audio on, 3/3 die at ~1.0s and mint no project; audio off, 3/3 survive to 3.3s, 7.4s and 25.0s and each mint one. That matches the movieFragmentInterval A/B exactly. It also corrects the row. I wrote that stop produces no error dialog. It does -- a toast carrying the raw AVFoundation string. My screenshots simply landed after it auto-dismissed. The defect is unchanged; the claim about what the user sees was wrong, and a row that misdescribes the symptom sends the next person looking for a silent failure that is not silent.
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In `@technical-documentation/testing/manual-e2e-checklist.md`:
- Line 415: Update the export-pass wording in the checklist row to report the
measured 7 ms duration difference between the 5.290-second expectation and
5.283-second result, rather than describing the duration as exact; retain the
existing under-one-frame tolerance context.
- Line 415: Revise the manual E2E checklist entry to avoid claiming the failure
is not load-related based only on the two standalone helper reproductions. State
only that the failure was reproduced outside the full app flow, and retain any
conclusion about load only if independently controlled evidence supports it.
Apply the same fix in `@technical-documentation/testing/manual-e2e-checklist.md`
at line 415.
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technical-documentation/testing/manual-e2e-checklist.md
…me death The row could say audio was not required for the failure, but only by pointing at runs that took screenshots mid-capture. That layer hides non-allowlisted windows at the window-server level, which is exactly the kind of thing that makes ScreenCaptureKit hiccup, so the claim rested on the one variable a reader would rightly challenge. Controlled run: audio off, not one screenshot taken while capturing. Same death -- 8.008s of video, flat for the next 76s with the helper still alive, zero sidecars, same -11800/-16341. That also reconciles the by-hand takes with mine, which looked contradictory: the writer dies after a variable delay, so a take stopped before it dies is genuinely clean. 3.3s and 7.4s survive, 8.0s does not. The row now says the thing that matters to anyone reaching for a workaround -- turning audio off buys time, it does not buy safety.
The Results log is the durable artifact, and a row that records a blocker with no pointer to its resolution invites the next person to re-derive it. #375 root-causes this one to a version 0 trun carrying a negative composition offset, and the row now says so -- along with the part that still needs doing, which is re-running this section against a CI build that carries the fix.
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Inline comments:
In `@technical-documentation/testing/manual-e2e-checklist.md`:
- Line 415: Update the manual E2E checklist result to clarify that the rc.1 run
only reproduced the writer failure and did not validate `#375`. Replace the claim
that the issue was “Root-caused and fixed in `#375`” with wording that the
reported root cause and fix are in `#375`, and retain the instruction to rerun
this section against a CI build containing `#375` before rc.2.
Apply the same fix in `@technical-documentation/testing/manual-e2e-checklist.md`
at line 415.
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technical-documentation/testing/manual-e2e-checklist.md
Review pushed on four sentences, and rebuilding the broken arm while answering it turned one of them from overstated into wrong. "Not load-related" was drawn from two standalone reproductions at a lower resolution. Those show the failure is not confined to the app's 4K60 path, which is not the same thing: append rate demonstrably changes how reliably it bites, reliably at ~57 fps and intermittently at 30. "A/B isolates it" was a sample presented as a law. A later rebuild of the with-the-line arm survived 22.2s at settings that had killed it twice at 1-2s, so the counts narrow the with-audio path and no more. The case rests on the bytes, not the tally, and the row now says so. The same variable also dissolves the video-only local-versus-shipped gap this row called unexplained: 56.6 fps shipped against 29 fps locally, not the released artifact. "Duration exact" was followed in the same clause by the 7 ms it differed by. "Root-caused and fixed in #375" claimed for this run a validation it never did. The run reproduced the failure; the fix is verified at helper level in #375 and in the packaged app nowhere yet. Also attributes the mvex/moof observations to the samples they came from, including the one kill that carries mvex with zero moof because capture had already stalled twelve seconds before the kill landed.
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The "A/B isolates it" point deserves more than a wording tweak. While answering the #375 review I rebuilt the with-the-line arm, and it survived 22.2 s at settings that had killed it twice at 1–2 s. So the failure is probabilistic, and my "2/2 vs 3/3" was a sample presented as a law. It is rate-dependent: reliable at ~57 fps, intermittent at 30. That same variable also dissolves the gap this row called unexplained. The video-only local-vs-shipped discrepancy (local survived 45 s, shipped failed 5/5) is 56.6 fps shipped against 29 fps locally, not anything about the released artifact. The row no longer blames the artifact. What the case actually rests on is unchanged and is byte-level: composition offsets unrepresentable in a version 0 |
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Adds one row to the Results log in
technical-documentation/testing/manual-e2e-checklist.md. macOS had never been validated for 1.9.5; the Windows pass is #369.Build tested
v1.9.5-rc.1, macOS Apple Silicon DMG (CI-built, Developer ID signed), macOS 26.5 (25F71) on M1.rc.2 is not published — only rc.1 exists on Releases. No native source changed between
v1.9.5-rc.1andorigin/release/v1.9.5, so this artifact already carries what would be the rc.2 native payload. #366 is cross-platform TypeScript and is therefore absent from it.The headline: the prescribed check cannot see the thing it checks
a6795d23's macOS half is active — but not the way the plan expects.On a clean stop
AVAssetWriter.finishWriting()collapses its fragments back into a normal movie. A cleanly stopped macOS file isftyp mdat moov,mvexabsent, 0moof, nomfra— byte-for-byte the shape the plan calls the headline failure. The pre-a6795d23control recording (2026-08-10) has the same shape, so the clean-stop box walk cannot separate fragmented from plain on macOS.Fragmenting shows up only in takes whose writer died:
mvexplus ~1moofper second of media (35moof/36.0 s, 14/15.0 s, 3/4.0 s, 18 on a killed helper). On macOS the kill test is the assertion. No macOS file, clean or killed, ever carriedmfra.Blocker found on the way
Every app-driven recording truncates, and the app then discards a take it could have kept.
{"event":"error","code":"writer-failed"}; main logAVFoundationErrorDomain Code=-11800 … (-16341).session.json, no.cursor.json, no editor, no error dialogThis is the #363 gap firing with nothing killed at all.
Cause narrowed by a one-line A/B
Helper built twice from source identical to the rc.1 tag, differing only by
writer.movieFragmentInterval(701 vs 700 lines). System audio on, 1080p30:movieFragmentIntervalwriter-failed2/2 (2.0 s, 1.0 s)recording-stopped3/3 (40.6 s, 37.9 s, 37.6 s)Loose end, recorded rather than smoothed over: video-only, the local build outlived the shipped binary 2/2 against 0/5. That gap is unexplained and needs more samples before the released artifact is blamed.
What passed
h264_videotoolbox (zero-copy VT), 318 packets, decodes clean, duration exact: source 26.713 s − trims (19.910 + 1.513) = 5.290 s expected vs 5.283 s measuredmoof, decodes clean (exit 0, 1373 packets), nomfraNot covered
Windows-only DPI and wgc-capture, GIF, AI sections, packaging (per plan). #366 is not runnable as specified — absent from rc.1, rc.2 unpublished, and record→editor never completes; the adjacent behaviour was measured instead (19→19 projects across close+reopen, exactly one project per recording, Blur BG and padding persisted). Webcam PiP and microphone are untestable on this Mac, which has neither.
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