> First, you need ffmpeg (ymmv.. this assumes macOS, for others installing ffmpeg is also possible but left as an exercise for the reader): > $ brew instal

> First, you need ffmpeg (ymmv.. this assumes macOS, for others installing ffmpeg is also possible but left as an exercise for the reader): > $ brew install ffmpeg FWIW, there's a `brew` fork for linux: https://github.com/Linuxbrew/brew https://github.com/Linuxbrew/brew It's not especially useful in this case as ffmpeg is available in linux package managers, but it's handy for tools that aren't.