feat: replace the archive.org asm.js encoder with vendored ffmpeg.wasm
MP4/GIF export used to importScripts() an 18.5 MB asm.js ffmpeg build from https://archive.org/download/ffmpeg_asm/ffmpeg_asm.js: no integrity check, no pinning, executed in the page, and unavailable offline. vendor.mjs now copies ffmpeg.wasm out of node_modules, where package-lock.json pins it by hash, and no CDN fallback is left anywhere in the app. @ffmpeg/core-st is the single-threaded core, chosen deliberately: the default @ffmpeg/core is built with pthreads and needs SharedArrayBuffer, which requires COOP/COEP isolation, which would break the Pixabay, Unsplash and Google Fonts requests. That core also forces two things worth knowing: - mainName: 'main' is mandatory. The loader defaults to proxy_main, which only the multi-threaded build exports, so load() compiles all 23 MB and then aborts. - Its main() calls exit(), so an instance survives exactly one command. Reusing one dies with "Program terminated with exit(0)", so convertStreams builds and tears one down per conversion (~110 ms, and the 23 MB heap comes back in between). The teardown also runs on failure: an interrupted run otherwise leaves the loader's "running" flag set and wedges every later conversion until a page reload. MP4 encodes with libx264 -crf 23 -pix_fmt yuv420p plus AAC rather than mpeg4 -b:v 6400k. Same core, better quality per byte, and yuv420p is what makes it play in Safari and QuickTime. The two @ffmpeg packages are dependencies, not devDependencies, so the Docker vendor stage can npm ci --omit=dev without pulling in electron; build.files excludes them from the asar since src/vendor/ffmpeg/ already carries the copies the app loads. WITH_FFMPEG=0 now means MP4/GIF export is unavailable and says so, rather than silently fetching an encoder at run time. Also deletes src/js/libraries/ffmpeg.min.js, an unreferenced ffmpeg.wasm loader stub that would have fetched its core from unpkg, and prunes the stale src/vendor/ffmpeg_asm.js from existing checkouts — src/vendor/ is packaged whole, so it would have shipped 18.5 MB of dead weight in every installer. Verified in Chromium against a real MediaRecorder WebM: core loads with crossOriginIsolated false, MP4 24 KB decoding to 320x240 / 2.00 s, GIF 138 KB, the two back to back, and the missing-core path reporting correctly. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Claude Opus 5
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@@ -8,6 +8,10 @@
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"name": "motionity",
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"version": "1.0.0",
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"license": "MIT",
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"dependencies": {
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@@ -317,6 +321,27 @@
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"license": "MIT"
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@@ -2531,6 +2562,26 @@
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"license": "MIT",
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"dependencies": {
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"engines": {
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"node": "4.x || >=6.0.0"
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"peerDependencies": {
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"encoding": "^0.1.0"
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"optional": true
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@@ -2942,6 +2993,12 @@
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@@ -3365,6 +3429,12 @@
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@@ -3481,6 +3551,22 @@
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