OpenCut's video preview and audio playback both rely on mediabunny, which
in turn requires the WebCodecs API (VideoDecoder / AudioDecoder). On
browsers where WebCodecs is not exposed (e.g. Linux Chromium builds
without proprietary codec support), import and playback both throw
"codec not supported" errors and the editor becomes unusable.
This change makes the editor work on those browsers without sacrificing
the WebCodecs fast-path elsewhere:
- Add a server-side /api/convert-video route that transcodes incoming
videos to H.264 baseline 3.1 yuv420p via the system ffmpeg binary.
processMediaAssets uses it automatically when readVideoFile reports
canDecode=false so the asset stored is always something the browser
can play.
- Add HTMLVideoElementSink, a CanvasSink-shaped sink backed by a
hidden <video> element + canvas.drawImage. VideoCache.initializeSink
selects it only when WebCodecs VideoDecoder is unavailable; otherwise
it keeps using mediabunny's CanvasSink unchanged.
- Add FallbackAudioBufferSink, an AudioBufferSink-shaped sink backed by
AudioContext.decodeAudioData (which uses the platform's native audio
decoders, not WebCodecs). AudioManager and the import-time decode
path swap to it on canDecode=false. runClipIterator is wrapped in a
try/catch so a sink failure no longer leaves an unhandled rejection.
Tests cover frame timing, dispose semantics, FPS clamping, the
WebCodecs/AudioDecoder availability probes, AudioBuffer slicing, and
the fallback iterator contract.
The freeform mask was assembled on every getMaskDefinition("freeform") call,
re-spreading params and injecting a wrong SquareIcon placeholder, with a type
cast to suppress the structural mismatch. Root cause: MasksRegistry was keyed
on BuiltinMaskType, so freeform had no entry.
- Re-key MasksRegistry from BuiltinMaskType to MaskType
- Register freeform alongside builtins in registerDefaultMasks, with
PenToolAddIcon as its menu icon
- getMaskDefinition and getMaskDefinitionsForMenu become plain registry
lookups with no branching, no manual spreading, no cast
- Rename RegisteredBuiltinMaskDefinition to RegisteredMaskDefinition and
tighten computeParamUpdate return type to Partial<BaseMaskParams>
Co-authored-by: Cursor <cursoragent@cursor.com>
The { kind: "tangent" } MaskHandleId variant was never constructed — neither
getFreeformDisplayHandles nor any other code ever produced a tangent handle
object. The in/out control-arm branches in computeFreeformParamUpdate, the
tangent case in maskHandleIdKey, and the CUSTOM_MASK_TANGENT_SIZE rendering
path in mask-handles.tsx were all unreachable. Removed all four dead paths
and removed "tangent" from MaskHandleKind.
Co-authored-by: Cursor <cursoragent@cursor.com>
- Remove dead ternary in getPreferredEdges (always returned undefined; the
all-false object was never reached by Object.values().some(Boolean))
- Document why drawWithFeather descriptors zero the feather field in the
compositor (analytical renderer handles softness itself; zeroing prevents
a second JFA feather pass)
- Remove legacyType from V30→V31 migration (not consumed anywhere; a
down-migration can map type:"freeform" back to "custom" directly)
- Add V30→V31 test coverage: skip-guard branches, freeform passthrough,
elements without a masks array
- Add snap tests for vertical-edge (bottom) and uniform-scale handle paths
Co-authored-by: Cursor <cursoragent@cursor.com>
Move timeline and preview gestures into dedicated controllers so hooks stay thin around editor state and DOM events.
This also routes drag and playback synchronization through manager APIs and reuses persistent wasm surfaces so scrubbing, seeking, and preview rendering stay in sync.
Made-with: Cursor
Andrés Villagrán
Maze
Maze Winther