cannot read m4a tags

[sezanzeb]

With this m4a file: test.m4a.zip

ffprobe 4.2.2 prints

album           : test3
artist          : test1
comment         : test7
genre           : test6
title           : test2
track           : 4

whereas mutagen 1.44.0-1

import mutagen.mp4 as m
f = m.MP4('test.m4a')
print(f.tags)

prints

{}

mutagen/mp4/__init__.py load doesn't have the tags in ilst. But when I add some tag in exfalso, it appears there.

The audio in the file was converted to m4a with gstreamer. Also, when converting that file to flac, the tags will appear in exfalso again.

[sezanzeb]

I just faced issues with m4a files again. They appear in other tools.