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JamesandClaude Opus 4.7
a707b6a882
- Extract applyMask helper from postprocess and add 5 unit tests pinning the contract this PR is selling: fg.alpha + bg.alpha === 255 per pixel, RGB triples byte-identical between fg and bg, and bg=null path leaves the bg buffer untouched. Without these, a future postprocess change (mask threshold, premultiplied alpha, gamma) could silently break the inverse-alpha relationship and the existing plumbing tests would all still pass. - Add stdin 'error' listener inside spawnFfmpeg. If either encoder dies mid-render, Node emits an unhandled error on the dead writable on the next .write() and crashes the CLI before waitForExit's reject path can surface the encoder's stderr tail. Doubled encoder count = doubled failure surface, so this is worth pinning down. - Tighten stdio param to a 3-tuple so an accidental 1-element array fails at type-check. - Sharpen backpressure comment: write→true means "highWaterMark not exceeded," not "libuv flushed." Reuse-without-corruption is safe only because session.process is slow enough that libuv drains in between. Addresses review on PR #637. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>