Unmodified FFmpeg 9.0.2 sources, verified signature/public key, exact MIT hardware headers, mingw-w64 11.0.1-3build1 source and distro patches. No BtbN or FFTW input. See docs/FFMPEG_LGPL.md. Rebuild using the supplied workflow and pinned config. For an offline-input build, set GITHUB_WORKSPACE to this extracted folder and invoke tools/ffmpeg/build.sh inside the pinned Ubuntu container after installing the workflow prerequisites. The script rechecks input SHA-256 and the GPG fingerprint. Toolchains/build utilities remain prerequisites. No application object code is needed to replace the shared DLLs.
