This (commercial) program[1] does the job for Spotify. I think what it does is just play the given playlist then it sets Spotify's audio output to a virtual aud

This (commercial) program[1] does the job for Spotify. I think what it does is just play the given playlist then it sets Spotify's audio output to a virtual audio device similar to BlackHole[2], then reads from it, encodes the audio, fetches the metadata (including album art) and sets it. There are open source[3] alternatives[4] but I haven't tested them. [1] https://www.noteburner.com https://www.noteburner.com [2] https://github.com/ExistentialAudio/BlackHole https://github.com/ExistentialAudio/BlackHole [3] https://github.com/jwallet/spy-spotify https://github.com/jwallet/spy-spotify [4] https://github.com/richardk80/spotify-ripper https://github.com/richardk80/spotify-ripper