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[1/3] feat: play html5 frames as they bake - #271
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# [2.30.0](v2.29.5...v2.30.0) (2026-10-29) ### Bug Fixes * give html5 and rich-caption clips their own look on the timeline ([#275](#275)) ([7a7eb39](7a7eb39)) ### Features * hold the nearest baked html5 frame while playing ([#272](#272)) ([4f50166](4f50166)) * play html5 frames as they bake ([#271](#271)) ([7e837e6](7e837e6)) * tell viewers when html5 playback is buffering ([#274](#274)) ([65098cf](65098cf))
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🎉 This PR is included in version 2.30.0 🎉 The release is available on: Your semantic-release bot 📦🚀 |
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Until an html5 clip finished baking, playing it showed full-size stills rendered on demand. Clips also baked one after another, so an edit with several overlapping html5 clips stayed choppy for most of its wait.
A bake now stores each frame at its index as soon as the frame lands. While a clip's first bake runs, the clip plays those frames instead of rendering stills. A bake starts at the playhead's frame. Pages only seek forward, so the frames before the playhead come from a second fresh page. Bakes take turns frame by frame, ranked by the frame playback needs next, so overlapping clips under the playhead fill in together. All bakes share one 256 MiB in-flight budget, so taking turns doesn't multiply memory.
Export still renders stills mid-bake, and the cache still stores only complete bakes. A sharper re-bake keeps the complete frames on screen until it finishes.
Size: 465 lines, of which 175 are source and the rest tests. The store, the turn-taking and the playback of partial frames depend on each other, so none of them can ship alone.
Squash subject:
[1/3] feat: play html5 frames as they bake. This cuts a minor release.Verify:
npx jest tests/html5-player.test.ts tests/bake-queue.test.ts tests/bake-order.test.ts. Then open an edit with several overlapping html5 clips and press play straight away. Stretches that are already baked should play smoothly before the preparing count finishes.Risk: medium. The capture loop and the queue changed shape. A bake that stalls leaves stills on screen, as before.