Packaging recipe adaptation by Melukis source research, 2026-10-04. Original recipe: ffmpegwasm/ffmpeg.wasm commit 71aa99d37c02a7b4c435275ca9ef50e612f6efa1. Source Git ADD/clone steps are replaced by COPY of the archived, hash-bound source trees in distribution-manifest.json. zimg googletest submodule is supplied explicitly. Current SDK image digest is pinned for repeat builds. The optional mutable experimental Docker frontend directive is removed because no remote Git ADD remains. FFmpeg/core configure, compile, link, bindings, single-thread and SIMD flags remain the original recipe. SDK SDL port retains its original fixed source hash. No claim that this packaging adaptation was used to create the stock npm binary. No build was executed.