I had serious trouble to correctly map the somewhat stupidly named MusicBrainz Picard internal tag "MusicBrainz Recording ID". While other common MusicBrainz Picard tags are correct mapped, this one isn't. I thought it's "MUSICBRAINZ TRACK ID" because that's how mp3tag is showing that tag written by Picard but when I write that tag with mp3tag, Picard is not recognizing it. I created a mapping for MP4 - MUSICBRAINZ TRACK ID - MUSICBRAINZ_TRACKID
Turns out, the correct mapping is MP4 - MusicBrainz Track Id - MUSICBRAINZ_TRACKID
Thanks for the list! I see why this one doesn't work for MP4 while the others do.
Could you please add another mapping for MP4, Source: MusicBrainz Track Id, Target MUSICBRAINZ_TRACKID. That will fix the mapping for this tag for MP4. It already works fine with MP3 and FLAC. Thanks