fix(editor): split clips without moving their source in-point - #923
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uma-co82 wants to merge 2 commits into
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fix(editor): split clips without moving their source in-point#923uma-co82 wants to merge 2 commits into
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Splitting a sped-up clip and deleting the middle leaves the deleted footage in the export and drops a matching stretch from the end of the recording. `ClipRegion.startMs` is a source position while the split position is a timeline position, and the two only coincide at 1x. `handleClipSplit` assigned the timeline position as the right half's source start, so at 2x the right half re-read footage the left half already covered. Cutting the 10s-20s playback window out of a 2x clip removed source [100s,120s] instead of [20s,40s]: nothing in the middle was cut and the last 20s of the recording silently disappeared. Anchoring the right half at the source time the split maps to fixes the export, but it would also drag the clip across the timeline, since the clip row draws items at `startMs`. So separate the two meanings: `sourceStartMs` says where a clip reads from, `startMs` stays where it sits. It falls back to `startMs` when absent, so stored projects behave exactly as before and need no migration. Left-edge drags in `handleClipSpanChange` were wrong in the same way and now advance `sourceStartMs` by the source the trimmed edge covered; moves carry their footage along unchanged. The split itself moves into a pure `planClipSplit`, matching how `planClipSpeedChange` is already factored, so it can be covered by tests. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017ZyJLpqdwGjGvR4yy44xWU
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Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughThe change preserves source offsets during clip splitting and trimming. Source-aware boundaries now drive persistence, trim-gap calculation, audio lookup, timeline projection, timeline items, and speed-region calculations. ChangesSource-aware clip editing
Estimated code review effort: 3 (Moderate) | ~20 minutes Sequence Diagram(s)sequenceDiagram
participant useClipRegionCommands
participant planClipSplit
participant ClipRegion
useClipRegionCommands->>planClipSplit: request split at splitMs
planClipSplit->>ClipRegion: derive right sourceStartMs from left source end
planClipSplit-->>useClipRegionCommands: return left and right clips
Merge Risk: ⚪ Minimal · up to This preserves the correct source footage when sped-up clips are split or moved and keeps trimming accurate. The available checks and targeted tests pass, so no merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
Warning Some tools did not complete. Review the errors below. 🔧 Biome (2.5.10)src/components/video-editor/timeline/model/timelineModel.test.tsBiome could not lint this file: nested root configuration. Check the repository's Biome configuration and plugins. src/components/video-editor/timeline/model/timelineModel.tsBiome could not lint this file: nested root configuration. Check the repository's Biome configuration and plugins. src/components/video-editor/types.test.tsBiome could not lint this file: nested root configuration. Check the repository's Biome configuration and plugins.
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Inline comments:
In `@src/components/video-editor/timeline/model/timelineModel.ts`:
- Line 74: Update the sourceSpan construction to keep both boundaries in source
coordinates: retain getClipSourceStartMs(region) for start and replace
sourceEndMs with getClipSourceEndMs(region) for end.
In `@src/components/video-editor/types.ts`:
- Around line 388-390: Update the trim-gap construction around
getClipSourceStartMs so it collects source-order spans independently of timeline
iteration order, sorts them by start, and merges overlapping or adjacent spans
before creating gaps. Ensure useTimelineProjection receives only genuine
uncovered gaps and does not persist false or overlapping trims.
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📒 Files selected for processing (9)
src/components/video-editor/audio/clipAudio.tssrc/components/video-editor/clipSplit.test.tssrc/components/video-editor/clipSplit.tssrc/components/video-editor/hooks/useClipRegionCommands.tssrc/components/video-editor/hooks/useTimelineProjection.tssrc/components/video-editor/project/useProjectLibraryController.tssrc/components/video-editor/projectPersistence.tssrc/components/video-editor/timeline/model/timelineModel.tssrc/components/video-editor/types.ts
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…ders Addresses review feedback on the source in-point split. `buildTimelineItems` still derived `sourceSpan.end` from the timeline `startMs`, so a split clip's source-audio waveform rendered the wrong range while `sourceSpan.start` was already correct. `clipsToTrims` walked clips in timeline order while treating the source in-point as monotonic. That held before, when the two were the same field, but a move now keeps its footage, so the cursor could run backwards: source spans [20,30] then [0,10] emitted overlapping gaps that trimmed away a range a clip was still using. It now walks the claimed source spans in source order and merges overlaps. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017ZyJLpqdwGjGvR4yy44xWU
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Description
Splitting a clip with the scissors assigned a timeline position as the right half's source in-point. The two only coincide at 1x, so on a sped-up clip the right half re-reads footage the left half already covers.
This separates the two meanings —
startMsis where a clip sits on the timeline, a new optionalsourceStartMsis where it reads from in the recording — and moves the split into a pureplanClipSplit(), mirroring howplanClipSpeedChange()is already factored.Motivation
Splitting a sped-up clip and deleting the middle leaves the deleted footage in the export and silently drops a matching stretch from the end of the recording.
On a 2x clip in a 120s recording, cutting the 10s–20s playback window removes source
[100s, 120s]instead of[20s, 40s]— nothing in the middle is cut, and the last 20s of the recording disappears without any indication.ClipRegion.startMsis a source position, but the split position handed tohandleClipSplitis a timeline position:At 2x, 10s of playback consumes 20s of source, so the right half overlaps the left half and
clipsToTrims()then trims the tail that no clip claims. At 1x the two positions are equal, which is why this only appears once a speed is applied.Anchoring the right half at the source time the split maps to fixes the export on its own, but it would also drag the clip across the timeline, because the clip row draws items at
startMs(timelineModel.ts). Hence the separate field.getClipSourceStartMs()falls back tostartMswhensourceStartMsis absent, so existing projects behave exactly as before and no migration is needed. Splitting now leaves both halves visually where the clip already was.Left-edge drags in
handleClipSpanChangewere wrong in the same way and now advancesourceStartMsby the source the trimmed edge covered; moves carry their footage along unchanged.Type of Change
The refactor is limited to extracting
planClipSplit()so the behaviour can be unit-tested — the project has no hook-testing setup, and this avoids adding one.Related Issue(s)
None that I could find — happy to open one if you would prefer the bug tracked separately.
Screenshots / Video
No UI change: clips stay exactly where they were on the timeline before and after the split. The defect and the fix are both in the exported file, so the behaviour is captured as assertions instead — see
clipSplit.test.ts, in particular "removes the source range the user cut out when the clip is sped up", which reproduces the 2x scenario end to end throughclipsToTrims().Testing Guide
Manual:
Before: the 10s–20s window is still there and the end of the recording is missing. After: exactly the intended window is gone and the recording ends where it should. The two halves should not move on the timeline when you split.
Automated:
npx vitest --run src/components/video-editor/clipSplit.test.ts npx vitest --run # 1095 tests / 122 files npx tsc --noEmit npx biome check src/components/video-editor3 of the 9 new tests fail against the previous behaviour, so they pin the regression rather than just describing the new code.
I also sanity-checked the model against a real recording outside the test suite: a clip of
[0, 86264]at 2.5x maps to source215,660ms, andffprobereports that file is215,748mslong — confirmingstartMs/getClipSourceEndMs()are source-domain.Checklist
Thank you for contributing!
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https://claude.ai/code/session_017ZyJLpqdwGjGvR4yy44xWU
Summary by CodeRabbit
New Features
Bug Fixes
Tests