fix(macos): stop the take when the writer dies mid-capture, and tell the user - #655
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EtienneLescot
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September 14, 2026 09:10
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Included review availability: Your plan provides up to 8 included reviews per hour; 5 remain after this review. 📝 WalkthroughWalkthroughThe Electron flow now handles current-process native macOS errors during active recording. The recorder now shares one in-flight shutdown task across concurrent stop calls and blocks pause and resume during shutdown. ChangesCapture failure handling
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant ScreenCaptureHelper
participant NativeMacCaptureOutputDrain
participant MainWindow
participant ScreenCaptureRecorder
ScreenCaptureHelper->>NativeMacCaptureOutputDrain: Emit active error
NativeMacCaptureOutputDrain->>MainWindow: Send stop-recording-from-tray
MainWindow->>ScreenCaptureRecorder: Request stop
ScreenCaptureRecorder->>ScreenCaptureRecorder: Share in-flight shutdown task
Merge Risk: ⚪ Minimal · up to The updated shutdown flow does not block subsequent recordings because each recording uses a new helper process. No actionable merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
In `@electron/ipc/handlers.ts`:
- Around line 1513-1515: Add package-local test coverage for the event handler
around onErrorDuringCapture, verifying the callback runs only for error events
after recordingStarted and only when nativeMacCaptureProcess matches proc, while
non-error events, pre-recording errors, and inactive processes do not invoke it.
In
`@electron/native/screencapturekit/Sources/OpenScreenScreenCaptureKitHelper/ScreenCaptureRecorder.swift`:
- Around line 358-360: Update ScreenCaptureRecorder.stop() to retain the active
shutdown Task started after writer failure and have subsequent stop() calls
await that same task, rather than returning immediately when isStopping is true;
ensure the command loop does not exit until finishWriter() completes and the
terminal event is emitted.
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electron/ipc/handlers.tselectron/native/screencapturekit/Sources/OpenScreenScreenCaptureKitHelper/ScreenCaptureRecorder.swift
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A writer failure now starts stop() on its own task, and Electron sends `stop` right after. The second call returned at once, so the command loop could exit(0) before finishWriter() emitted its terminal event. Every caller now awaits the one shutdown task. Also moves the mid-take error rule out of the drain into its own module, with tests for the cases it must ignore (CodeRabbit on #655).
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This was referenced Sep 14, 2026
EtienneLescot
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Sep 14, 2026
…t error The macOS stop resolved on `recording-stopped` and rejected on the first `"event":"error"` anywhere in the helper's buffered output, replaying the whole take to find one. Since #655 the helper raises non-terminal errors on purpose (`writer-failed-during-capture`, and `capture-stopped-with-error` before it), stops itself, and only then reports a terminal outcome. So the stop rejected before the helper had been told to stop, and three cases went wrong: - Capture stopped on its own but the file was finalized: the take was thrown away with an error although `recording-stopped` followed. - The helper died without a word (killed, crashed): nothing noticed until the user pressed Stop, which then waited the full 30 s for a `close` that had already happened and put the whole helper log in the toast. - Cancel/Restart after a failed stop left the .mp4 behind, because deleting it depended on the stop having worked. The stop now lives in electron/recording/nativeMacCaptureStop.ts, the twin of nativeWindowsCaptureStop.ts, and settles when the helper exits. The helper always exits after `stop` once it has said its last word, so `close` is the one moment the output is complete and the file is no longer being written. It resolves instead of rejecting: - `recording-stopped` wins; an earlier interruption becomes a warning the HUD shows, and the take opens. - A terminal error reports the interruption's message when there was one ("the video file could not be written"), not the raw NSError behind it. - Exit 0 with no word keeps the old meaning, except after an interruption, where it only means the command pipe closed. - An exit the output drain already recorded settles at once. - On timeout a helper that already reported a finalized file still counts as a success; one that has not is not killed, because this helper has no shutdown ceiling and a long finishWriting has not been measured. The live-take watch from #655 now also fires when the helper process closes mid-take, and ignores the exit a stop in flight causes. `stop` is only written to a helper that can still hear it, and the command pipe has an error listener. A discard removes the take's files whatever the stop returned. Salvaging the fragments of a take whose writer died is left to a follow-up.
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Summary
On macOS a writer that dies mid-take is now noticed when it dies. The take stops and the user gets an error, so the HUD no longer counts over a dead writer.
Why it was silent. The helper already emitted
writer-failed-during-capture(shipped in 1.9.6, the reporter's build). Two gaps kept anyone from acting on it:waitForNativeMacCaptureStartandwaitForNativeMacCaptureStoponly subscribe while pending. Anerrorevent raised between them just sat innativeMacCaptureOutputuntil the user pressed Stop.falseappend, behindisReadyForMoreMediaData. It never stoppedSCStream, which matches the 22 minutes of healthyreplaydheartbeats in the report.Changes
ScreenCaptureRecorder.swiftwriter.status == .failedon every complete frame, before the readiness gate.reportWriterFailurenow stops the capture, the sameTask { await stop() }thatdidStopWithErroruses. The process stays up and still answersstop.Recording stopped: the video file could not be written (...).electron/ipc/handlers.tserrorevent arrives afterrecording-startedfrom the current helper, it sends the HUD the existingstop-recording-from-traysignal.finalizeNativeMacRecordingshowstoast.errorand clears the HUD.nativeMacCaptureEvents, because the stop wait replays the buffer through that emitter.Deliberately not in this PR
nativeMacCaptureStop.tsalone. The failed stop still goes through the handler'scatch, which is where fix(mac): 【openscreen】録画終了時の保存失敗を救済する #571 adds its salvage.AudioTrackMixer. They still ignore the returnedBool. The shared writer status check covers them, soOpenScreenCaptureCoreis untouched.cli-stop-recording, not the tray channel. It gets the helper-side stop, but no early signal.Related issue
Refs #621
It covers the detection and "tell the user" half of the issue. Opening the salvaged file in the editor depends on #571.
Type of change
Release impact
Desktop impact
Screenshots / video
None. There is no UI change beyond an error toast that already exists.
Testing
Nothing here has been compiled, run or reproduced. The change was written on Windows, with no Swift toolchain and no
node_modules, so notsc, Biome or Vitest either. CI'sSwift test (macOS capture helper)job is the first compile of the Swift change.AVAssetWriterreportsisReadyForMoreMediaData == false. If it does, the old append-only check could never fire.writer-failed-during-capture;replaydstops loggingHealth:heartbeats for that session.🤖 Generated with Claude Code
Summary by CodeRabbit