Currently, the song scanning can find audio files that can't be played by the app. To keep the library clean, a combination of workarounds should be implemented:
Filter by file extension: Provide safe defaults (e.g. mp3, flac, ogg, wav) and let the user modify this list.
Let users manually exclude individual files from the library. Essentially, adding them to a blacklist for scanning. With multiselect, one could easily exclude whole albums and keep the library clean.
Currently, the song scanning can find audio files that can't be played by the app. To keep the library clean, a combination of workarounds should be implemented:
See: https://gitlab.com/fdroid/fdroiddata/-/merge_requests/12193#note_1195476076