fix(export): keep the progress bar honest and moving during the audio phase - #546
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… phase Two separate defects behind "exports frozen at ~80%", neither of them the audio cost that #371 addressed. **The bar could not reach 100%.** The native side reports a raw running count of composed frames and never a total, so the percentage is computed in the renderer — and both callers computed it as `sum(sourceEndSec - sourceStartSec) * fps`, which ignores speed regions. A clip under a 1.25x region emits `duration * fps / 1.25` frames, so the bar climbed to exactly 80% and the export finished there. That is the number in the title, arithmetically. A 0.5x region does the reverse and pins it at 100% for the second half. `outputFrameCount` mirrors `speed_segments_for_window` + `push_speed_segment`, which is what `walk_composited_timeline` actually iterates. The two sides share one fixture table, asserted by `outputFrameCount.test.ts` and by the new `speed_segments_match_the_exporter_frame_totals`, so a change to either goes red instead of drifting. What it cannot mirror is the walk's clamp of each clip to the source's real duration — only a decoder knows that — so a truncated source still reads slightly high, as it did before. **The bar stopped moving.** `on_clip_end` decoded and stretched the clip's audio on the render thread, and nothing calls `progress()` during that, so the bar parked at whatever percentage the clip's last frame reported. A clip's audio depends on nothing but that clip, so it now goes to `ClipAudioJobs` (at most four in flight, results indexed by clip) and the walk carries on to the next clip. The time leaves the export wall rather than being better displayed, and what is left to join at the end is at most the last clip. All three pipelines, not Windows alone — they had the same block character for character. GIF has no audio path and is untouched.
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe compositor now processes clip audio in bounded background jobs. Export progress now uses speed-adjusted frame counts shared between TypeScript and Rust. Tests and architecture documentation cover audio scheduling and frame-count parity. ChangesExport pipeline updates
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to Exports now report speed-adjusted progress and keep advancing while clip audio is processed in bounded background jobs. The change is mergeable with owner awareness that the new public API should remain intentionally scoped and that stalled audio decoding could still delay cancellation or shutdown. Sequence Diagram(s)sequenceDiagram
participant TimelineWalker
participant ClipAudioJobs
participant decode_and_stretch_clip_audio
participant ExportProgress
participant outputFrameCount
TimelineWalker->>ClipAudioJobs: spawn per-clip audio work
ClipAudioJobs->>decode_and_stretch_clip_audio: decode and stretch
decode_and_stretch_clip_audio-->>ClipAudioJobs: indexed PCM result
TimelineWalker->>ClipAudioJobs: collect results after traversal
ExportProgress->>outputFrameCount: count speed-adjusted output frames
outputFrameCount-->>ExportProgress: progress denominator
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Inline comments:
In `@crates/compositor/src/audio_jobs.rs`:
- Line 93: Update ClipAudioJobs and its walk_composited_timeline error paths so
every started audio job is cooperatively cancelled and its JoinHandle is joined
before the job collection is dropped, including failures before into_results().
Preserve normal result collection while ensuring early returns cannot detach
in-flight threads.
In `@technical-documentation/architecture/export-pipeline.md`:
- Around line 88-89: Update the export-pipeline documentation statement about
pending work after the walk: because ClipAudioJobs::spawn permits four jobs
before collection and into_results waits for all remaining inflight jobs, state
that up to four jobs can remain rather than only the last clip.
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crates/compositor/src/audio_jobs.rscrates/compositor/src/lib.rscrates/compositor/src/pipeline_linux.rscrates/compositor/src/pipeline_macos.rscrates/compositor/src/pipeline_windows.rscrates/compositor/src/regions.rssrc/cli/CliExportRunner.tsxsrc/components/ai-edition/ExportDialog.showInFolder.test.tsxsrc/components/ai-edition/ExportDialog.tsxsrc/lib/exporter/outputFrameCount.test.tssrc/lib/exporter/outputFrameCount.tstechnical-documentation/architecture/export-pipeline.md
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…eal bound Both from CodeRabbit, and both right. Dropping a `JoinHandle` detaches its thread. Between the first `spawn` and `into_results` there are `?` operators — the walk itself, the encoder flush — and on any of them the collection went out of scope leaving up to four audio decodes running in a native addon the host may unload. `Drop` now joins them, so nothing outlives the scope, error path included. This is a join, not a cancellation: `decode_clip_audio` is one long opaque call, and interrupting it would mean handing it an `AVIOInterruptCB` — a different change in a different file. The wait is bounded by the slowest of the four, which is seconds now that the stretch goes through atempo, and it is only paid by an export that has already failed. The other one is a claim I got wrong in three comments and the architecture doc: "at most the last clip" left to wait for after the walk. `spawn` admits four before it collects one, so up to four can remain — bounded by the slowest of them rather than by their sum, which is the part worth saying.
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Two defects behind "exports frozen at ~80%", neither of them the audio cost that #371 addressed.
The bar could not reach 100% — and 80% is not a coincidence
The native side reports a raw running count of composed frames and never a total, so the percentage is computed in the renderer. Both callers computed it as
sum(sourceEndSec - sourceStartSec) * fps, which ignores speed regions entirely.walk_composited_timelineemitssum(segment.frame_count), and a segment at speed s covering d seconds emitsd / s * fpsframes. So a clip under a 1.25× region emits exactly1 / 1.25 = 80%of what that formula predicts. The bar climbed to 80%, stopped, and the export finished there. Even with instant audio it would never have reached 100%. A 0.5× region does the reverse and pins it at 100% for the second half of the export.src/lib/exporter/outputFrameCount.tsmirrorsspeed_segments_for_window+push_speed_segment. The two sides share one fixture table, asserted byoutputFrameCount.test.tsand by the newspeed_segments_match_the_exporter_frame_totalsinregions.rs, so a change on either side goes red instead of drifting — a silent divergence here is a progress bar that lies, and it has shipped once already.What it cannot mirror: the walk clamps each clip's end to the source's real duration, which only a decoder knows. A source shorter than its declared window still reads slightly high, exactly as before.
The bar stopped moving
on_clip_enddecoded and stretched the clip's audio on the render thread, and nothing callsprogress()during that, so the bar parked at whatever percentage the clip's last frame reported — for minutes, back when WSOLA wasO(grain × radius)per rendered sample.A clip's audio depends on nothing but that clip, so there is no reason it should occupy the thread composing the next clip's frames. It now goes to
ClipAudioJobs(crates/compositor/src/audio_jobs.rs) — at most four in flight, results indexed by clip, a panicking job leaving its clip silent rather than taking the export down — and the walk carries straight on. What is left to join at the end is at most the last clip.I chose this over adding an audio progress contribution, which is what the issue suggested. Reporting during that phase would have meant changing the native → JS protocol (it carries an absolute frame count and nothing else) and splitting a total that the two sides compute separately, to display a wait rather than remove it. Moving the work deletes the wait and makes
export-pipeline.md's original claim — that the stretch overlaps the encode — true for the first time.All three pipelines, not Windows alone:
pipeline_windows.rs,pipeline_macos.rsandpipeline_linux.rshad the same block nearly character for character. GIF has no audio path and is untouched.Verified
cargo test -p openscreen-compositor --lib --tests— 162 pass, including the four newaudio_jobstests (indexing by clip rather than completion order, the empty slot for a clip with no audio, the concurrency cap under 32 jobs, and a panicking job).vitest run— 2225 pass, including the ten newoutputFrameCountcases.tsc --noEmitandbiome checkclean.Rust testjobs.🤖 Generated with Claude Code
Summary by CodeRabbit
Performance
Bug Fixes
Tests
Documentation