reniera;651309 Wrote: 
> I just retagged that album to make sure if was tagged OK in the first
> place and all fields come back exactly the same.
> 
> So it seems that indeed MusicBrainz have changed something and that
> we'll have to live with it ...
> 
> Thanks a lot for your time Erland
> 
Feels like Picard bug/limitation, according to the following page:
http://musicbrainz.org/doc/Picard_Tag_Mapping

Picard is supposed to map:
MusicBrainz Album Artist Id -> Release Artist -> TPE2
MusicBrainz Artist Id -> Artist -> TPE1

I think the issue they have here is that there are multiple artists for
the second track:
David Guetta: 302bd7b9-d012-4360-897a-93b00c855680
Chris Willis: 9871f931-c64a-4c09-b090-d1ce25b2c073

But Picard have choosed to write
- MusicBrainz Artist Id tag that contains the first artist
- TPE1 tag that contains a string that describes both artists but not
according to the tagging specification which says they should be
separated with "/"

And SBS interprets the TPE1 string when it detects if to create a new
artist or update an existing. The result is that you get two artists in
SBS but they both get the musicbrainz id of the first artist.

So Picard writes the data according to its own interpretation and SBS
interprets the tags a different way than Picards write them, the result
is incorrect behavior.

Unfortunately, there is information missing in the tags, so there is no
way SBS can handle it correctly. The only solution I can see is if
Picard would write multiple values to the tags, I believe this is
possible according to the MP3(ID3) tagging specification for the TPE1
tag (separated with "/") but it will probably break too many
applications if they started to write multiple values to the
"MusicBrainz Artist Id" tag. ID3 specification can be found here:
http://www.id3.org/id3v2.3.0

It would be interesting to see how Picard writes this to another
tagging format, for example FLAC files, which supports multiple
occurrences of the same tag. I'm guessing it shows the same issues, but
it would be interesting to verify this.


-- 
erland

Erland Isaksson ('My homepage' (http://erland.isaksson.info))
(Developer of 'many plugins/applets'
(http://wiki.slimdevices.com/index.php/User:Erland). If my answer
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and/or third party plugin/applet development, 'donations are always
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