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* Add non-owning conversions via ConversionOptions.ownsOutput A conversion with ownsOutput: false only adds tracks to the output and drives their media data; starting, finalizing, and metadata tags remain the caller's responsibility. This lets multiple conversions and directly-added user tracks compose on a single Output (see upstream issue #436). - ownsOutput: false allows a pre-populated output (state must still be 'pending') and seeds track-capacity accounting from existing tracks - execute() requires the output to be started and never finalizes it - cancel() closes only the conversion's own sources, releasing internal synchronizer waiters, and leaves the output usable - tags cannot be combined with ownsOutput: false - isValid requires at least one contributed track instead of the format's minimum track counts Prototype for API discussion; default (owning) behavior is unchanged. Co-Authored-By: Claude Fable 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01AJdfnbY9AFh9i9dKgtrj6E * Add external-audio example using a non-owning conversion Demonstrates composing a user-owned audio track (synthesized voiceover via OfflineAudioContext + AudioBufferSource) onto a picked video with Conversion.init({ ownsOutput: false }), including progress reporting and playback/download of the result. Co-Authored-By: Claude Fable 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01AJdfnbY9AFh9i9dKgtrj6E * Release synchronizer waiters when canceling during output finalization A non-owning conversion's cancel() previously no-oped entirely when the output (owned by someone else) was already finalizing or finalized, leaving pump loops parked in the track synchronizer and hanging execute() forever. Now it still marks the conversion canceled and releases parked waiters in that state, without force-closing sources (finalization owns flushing them at that point). Also adds coverage: non-owning onProgress monotonicity, canceling one of two sibling conversions, capacity seeding across sequential inits, exact metadata exclusivity, and cancel-before-execute. Co-Authored-By: Claude Fable 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01AJdfnbY9AFh9i9dKgtrj6E * Document non-owning conversions on the converting-media-files guide page Adds the doc section requested in #436: what ownsOutput: false does, the required choreography (add tracks -> output.start() before execute() -> run the conversion concurrently with your own sources -> finalize), the cancellation split (conversion.cancel() leaves the output alive; cancel both for a full abort and tear the output down on error paths), isValid semantics in this mode, and the tags restriction with the setMetadataTags() alternative. Also cross-links the fresh-output rule to the new section. VitePress build passes with dead-link checking on. Co-Authored-By: Claude Opus 4.8 <[email protected]> * Clean up conversion logic, add Output.tracks and .hasEnoughTracks(), move new conversion tests around, remove external audio example * non-owning -> composable, and update docs * Update --------- Co-authored-by: Claude <[email protected]> Co-authored-by: Vanilagy <[email protected]>