When I run collectiongain on an album containing (at least some) AAC files, the individual tracks are always marked as single tracks rather than as an album:
~/Music/Fiona Apple/Tidal $ collectiongain --regain -d .
Collecting files ...
[1] 08 The Child Is Gone.m4a |<single track>
[2] 04 Criminal.m4a |<single track>
[3] 09 Pale September.m4a |<single track>
[4] 03 Shadowboxer.m4a |<single track>
[5] 05 Slow Like Honey.m4a |<single track>
[6] 02 Sullen Girl.m4a |<single track>
[7] 10 Carrion.m4a |<single track>
[8] 06 The First Taste.m4a |<single track>
[9] 01 Sleep To Dream.m4a |<single track>
[10] 07 Never Is A Promise.m4a |<single track>
Even though both the artist, albumartist, and album are set to be the same for all these files. At first, albumartist was not set, and I thought that could be the problem, but I get the same result when it is set to equal artist. These files do not have MusicMatch tags.
When I run collectiongain on an album containing (at least some) AAC files, the individual tracks are always marked as single tracks rather than as an album:
Even though both the artist, albumartist, and album are set to be the same for all these files. At first, albumartist was not set, and I thought that could be the problem, but I get the same result when it is set to equal artist. These files do not have MusicMatch tags.