The FAQ refers to the Gotham changelog which has an entry for Library that includes:
Quote:Added extensive MusicBrainz tags support to the Music Library and Database
1. the "extensive MusicBrainz tag support" is actually support for 2 tags MUSICBRAINZ_ARTISTID
and MUSICBRAINZ_ALBUMID that are read at least in ID3, APE, and FLAC (Vorbis comment) tags (other supported tag formats not tested).
The MUSICBRAINZ_ARTISTID tag appears to work as follows (corrections please!):
The first tag found is associated with the first album artist found for that song file. The second occurrence is associated with the second album artist, etc. Based on this association, the MBID is stored in the Music Database. Note: if Album Artist tag is "various artists" it appears the association is performed on song artist, not album artist.
If the MUSICBRAINZ_ARTISTID tag was found and associated with an artist, a query based on that MBID will be passed to the designated music artist scraper. If the tag was not associated/not present, Album Artist name will be used as in previous versions.
Note that if an album artist has an associated MUSICBRAINZ_ARTISTID tag in one song file, but not in another, this can cause each to be entered into the database as different artists.
MUSICBRAINZ_ALBUMID works the same way, except only one ID should be present in the song tags.
A new setting is available in System\Settings\Music\Library: Override song tags with online information. When this is selected, when the scraper queries MusicBrainz web site using the MUSICBRAINZ_ARTISTID or MUSICBRAINZ_ALBUMID, the artist name or album name returned from MusicBrainz will be stored in the database, rather than the artist name or album specified in the song tags. This can cause instances where the MusicBrainz album artist name is stored, and the tagged artist name as well (different names).
A new scraper option for artist and album scraper is available "Local Info Only". These scrapers will only read tag data.
Album cover art can be read from MP4 file metadata for music video (this will be used as the thumbnail instead of an extracted video frame) (I need to confirm this, but it seems like this is the case).