We are using ffmpeg-static in our Electron app, and creating a universal mac build via electron-forge and under the hood electron/universal. But only the arm64 ffmpeg binary exists in the final app. I have confirmed that the ffmpeg-static module can be rebuilt manually with an arch param as arm64 or x86 (npm rebuild --arch=x64 -f ffmpeg-static, then confirmed with file node_modules/ffmpeg-static/ffmpeg) and the correct binary is created/downloaded. But when running the universal build, only os.arch() seems to be respected, which in this case is which is an M1 machine.

It seems electron-forge isn’t passing the correct arch to dependencies. If there were hooks in the universal build process, or some env vars set, I could manually rebuild this one ffmpeg module according to an arch. For example ffmpeg-static does read process.env.npm_config_arch, so if I were able to set that in between the x64 and arm64 builds (or electron/universal did), the module would build the correct ffmpeg binary.

I have attempted using hooks in electron-forge to try and switch based on arch, but that value is always universal. Also, building the app on separate Intel and M1 machines produces the appropriate ffmpeg binary.

How can ffmpeg-static in our case receive the correct arch?