The dhowden/tag library returns ID3v2 TXXX frames as *tag.Comm
structs (key='TXXX_N', Description='MusicBrainz Artist Id',
Text='uuid'), not plain strings. Vorbis comments are plain strings
(key='musicbrainz_artistid', value='uuid').
Previous code only handled the string case — all MP3 files silently
got empty MBIDs. Now handles three value types:
- string: Vorbis comments (FLAC/OGG) — key is the tag name
- *tag.Comm: ID3v2 TXXX frames (MP3) — Description is the tag name
- *tag.UFID: ID3v2 UFID frame (MP3) — MusicBrainz recording ID
Requires a full rescan to backfill MBIDs for MP3 files.
yonlu
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