I noticed that JRiver does not support some of the standard 1D3 V2.3 fields, some of which are heavily used by MusicBrainz, especially:
- TORY: Original Release Year (FLAC Tag: ORIGINALYEAR
- TMED: Release Medium (FLAC-Tag: MEDIA)
- TSRC: ISRC (International Standard Recording Code)
- TSO2: Album Artist Sort Order (Strangely, this is translated in the Tag dump, so JRiver must have some access I believe?) (FLAC: ALBUMARTISTSORT)
- TSOP: Artist Sort (Same comment as in TSO2) (FLAC: ARTISTSORT)
Unfortunately, I cannot add these tags myself, as JRiver only allows users to add TXXX fields. Musicbrainz is an excellent source for good metadata, especially if you want to differentiate the release date and original release date, or get curated sort order data.
Additionally, there are a number of custom musicbrainz fields that are non-standard. Examples include The Album Type (Album, Compilation, Soundtrack..), Release Country, etc. These fields I could add manally, since they are written to the TXXX tags, however then there would be no match between the Mp3 and Flac Tags. I could help myself with some Tag magic, but seeing the role of musicbrainz as a tag source, I would like to put forward the idea of supporting musicbrainz tags in jriver in general.
Adding support for these fields, at least for the standard tags (for which I cannot build a solution myself) would be a matter close to my heart. I'll happily research matching fields for other file types and offer myself to compile a complete list of fields in a google doc or something.
Edit: I requested something similar for the INITIALKEY field here:
https://yabb.jriver.com/interact/index.php/topic,100632.msg697875.html#msg697875 (solved very quickly, thanks again). That is a way I could provide files again for example.