SexualPolytope, 11 months ago (edited 11 months ago)

If I’m not wrong, the best way to have best possible quality would be:

ffmpeg -i file.opus -c:a libmp3lame -q:a 0 -map_metadata 0 file.mp3

I know you asked for GUI, but CLI tools are better at this job since it’s very easy to batch process the files using a combination of find and parallel.

Also, it’s probably a better idea to keep the files as they are and use a different audio player on your device. I don’t use iOS, so can’t suggest an app. VLC or mpv should work, but I personally prefer music apps with album, artist etc. support. For android, the app Gramophone is great. Another way would be to serve your files via a music server like navidrome and using a client like Tempo (again, it’s the android client I like, but surely there will be iOS alternatives).