@igpapi/ffmpeg-audio

Installed with @igpapi/android; you never import it. One thing to know: if a bundler inlines the packages into one file, copy the package's module/ directory beside what it loads from (details below).

The audio codec of igpapi, the Instagram private API Simulator for Node.js: what a Reel with a catalog song needs to mix the song into its sound. It holds FFmpeg 5.1 compiled to WebAssembly for Node, audio only, plus constant-bitrate padding of AAC frames. The platform package installs it.

• No native code and no install script: the WebAssembly is inlined (as base64) in one ES module, module/ffmpeg-audio.mjs, so there is no separate .wasm file and it behaves the same on Linux, macOS and Windows with Node 22 or later.
• Each run happens in its own worker thread, so your event loop keeps running while FFmpeg works. The thread is ended when the run settles or when the run's AbortSignal aborts.
• Two files must ship next to each other. The package loads module/ffmpeg-audio.worker.mjs and module/ffmpeg-audio.mjs by file URL (import.meta.url) at run time, so a bundler that inlines the package's dist into one file must still copy the package's module/ directory beside what it loads from.

License

This package is licensed under the GNU Lesser General Public License, version 2.1 or later (COPYING.LGPLv2.1), because it is FFmpeg.

• Configuration. The build is FFmpeg's LGPL configuration: no GPL or nonfree component is enabled. ffmpeg -buildconf in the module prints it.
• Source. The FFmpeg source is the unmodified release tarball named in module/ffmpeg-audio.manifest.json, with its URL and sha256: https://ffmpeg.org/releases/.
• Build recipe. recipe/build-in-container.sh builds the module inside the Emscripten SDK image the manifest pins by digest, and recipe/rebuild.mjs runs that build with Docker. The rebuild reproduces the module byte for byte, and the manifest records its sha256. The recipe is published and runs from the installed package (recipe/recipe-hash.mjs carries its own copy of the shared hash definition, put there when the package is packed); the rebuild needs Docker and the FFmpeg tarball the manifest names.
• Replacing the module. The module is a separate file that the package's own code loads at run time, so you can replace it with your own build.