If we're only adding new tags and not changing existing tags, is there a 
harm to that, or will it slow things down and make database more unwieldy?

Andy


On Sunday, July 31, 2016 at 12:28:59 PM UTC-4, Adrian Sampson wrote:
>
> Thanks for the detailed investigation! Compatibility with Picard is 
> generally a useful goal.
>
> As you continue to explore, would you mind filing individual bugs on the 
> issue tracker about pieces of missing metadata and alternative spellings? 
> In particular, when we decide how to format metadata keys for each field, 
> we’ll need to track down documentation for how to maximize compatibility 
> with other tools, so it needs some case-by-case discussion. And for that 
> kind of discussion, separate GitHub threads are the best way to get 
> feedback and organize the documentation we have.
>
> On a couple of specific cases:
> - We don’t yet fetch the composer field: 
> https://github.com/beetbox/beets/issues/506
> - ORIGINALDATE vs. ORIGINALYEAR was discussed on the mailing list 
> recently: 
> https://groups.google.com/d/msg/beets-users/hOZ6z8hRwKM/f1IJ3yPAAgAJ
> We didn’t reach a solid conclusion about which was standard, or even which 
> Picard preferred—so thanks for investigating! Perhaps we should be writing 
> the ORIGINALYEAR field in addition.
>
> Adrian
>
>
> On Jul 31, 2016, at 8:47 AM, Stefano Bossi <[email protected] 
> <javascript:>> wrote:
>
> Dear beets developer,
>
> I have started using beets since a couple of week and I have decided to 
> move my metadata work from Picard to Beets.
>
> I have controlled the differences between the metadata written by picard 
> and beets, here are my considerations. For my research I have used this 
> table map directly from musicbrainz site:
> /https://picard.musicbrainz.org/docs/mappings/ and the official flac 
> metadata inspection tool "metaflac"
>
> The track I used for the comparison is:  
> http://musicbrainz.org/release/43dd0b85-0f22-3fa4-80d8-e49c7310af83
>
> First of all I cleaned all the metadata with metaflac:
>
>
> metaflac --remove --block-type=VORBIS_COMMENT ./01\ -\ Koö\,\ January\ 24
> \,\ 1975\,\ Part\ I\ \(1\).flac
>
>
> After the clean up here and a new metadatation, here are the two results:
>
>
> With *Beets*:
>
>
> metaflac --list --block-type=VORBIS_COMMENT ./01\ -\ Köln\,\ January\ 24
> \,\ 1975\,\ Part\ I.flac 
> METADATA block #2
>   type: 4 (VORBIS_COMMENT)
>   is last: false
>   length: 1232
>   vendor string: Mutagen 1.32
>   comments: 51
>     comment[0]: ACOUSTID_FINGERPRINT=
>     comment[1]: ACOUSTID_ID=
>     comment[2]: ALBUM=The Köln Concert
>     comment[3]: ALBUM ARTIST=Keith Jarrett
>     comment[4]: ALBUMARTIST=Keith Jarrett
>     comment[5]: ALBUMARTIST_CREDIT=Keith Jarrett
>     comment[6]: ALBUMARTISTSORT=Jarrett, Keith
>     comment[7]: MUSICBRAINZ_ALBUMCOMMENT=
>     comment[8]: MUSICBRAINZ_ALBUMSTATUS=Official
>     comment[9]: MUSICBRAINZ_ALBUMTYPE=live
>     comment[10]: ARTIST=Keith Jarrett
>     comment[11]: ARTIST_CREDIT=Keith Jarrett
>     comment[12]: ARTISTSORT=Jarrett, Keith
>     comment[13]: ASIN=B0000262WI
>     comment[14]: BPM=0
>     comment[15]: CATALOGNUMBER=ECM 1064 /65
>     comment[16]: DESCRIPTION=
>     comment[17]: COMMENT=
>     comment[18]: COMPILATION=0
>     comment[19]: COMPOSER=
>     comment[20]: RELEASECOUNTRY=DE
>     comment[21]: DATE=1983
>     comment[22]: YEAR=1983
>     comment[23]: DISC=1
>     comment[24]: DISCNUMBER=1
>     comment[25]: DISCSUBTITLE=
>     comment[26]: DISCTOTAL=1
>     comment[27]: DISCC=1
>     comment[28]: TOTALDISCS=1
>     comment[29]: ENCODEDBY=
>     comment[30]: ENCODER=
>     comment[31]: GENRE=
>     comment[32]: GROUPING=
>     comment[33]: LABEL=ECM
>     comment[34]: PUBLISHER=ECM
>     comment[35]: LANGUAGE=eng
>     comment[36]: LYRICS=
>     comment[37]: MUSICBRAINZ_ALBUMARTISTID=061c4920-3ea6-4835-98f6-
> 02f3b82f5e3a
>     comment[38]: MUSICBRAINZ_ALBUMID=43dd0b85-0f22-3fa4-80d8-e49c7310af83
>     comment[39]: MUSICBRAINZ_ARTISTID=061c4920-3ea6-4835-98f6-02f3b82f5e3a
>     comment[40]: MUSICBRAINZ_RELEASEGROUPID=516d4629-7bf3-3ac3-907a-
> ed9a022db840
>     comment[41]: MUSICBRAINZ_TRACKID=efa85037-66ba-4910-ab97-86124ea515f3
>     comment[42]: MEDIA=CD
>     comment[43]: ORIGINALDATE=1975-11-30
>     comment[44]: SCRIPT=Latn
>     comment[45]: TITLE=Köln, January 24, 1975, Part I
>     comment[46]: TRACK=1
>     comment[47]: TRACKNUMBER=1
>     comment[48]: TRACKTOTAL=4
>     comment[49]: TRACKC=4
>     comment[50]: TOTALTRACKS=4
>
>
> With *Picard*:
>
> metaflac --list --block-type=VORBIS_COMMENT ./01\ -\ Köln\,\ January\ 24
> \,\ 1975\,\ Part\ I\ \(1\).flac 
> METADATA block #2
>   type: 4 (VORBIS_COMMENT)
>   is last: false
>   length: 1101
>   vendor string: Mutagen 1.27
>   comments: 37
>     comment[0]: BARCODE=042281006722
>     comment[1]: PRODUCER=Manfred Eicher
>     comment[2]: TITLE=Köln, January 24, 1975, Part I
>     comment[3]: RELEASECOUNTRY=DE
>     comment[4]: TOTALDISCS=1
>     comment[5]: LABEL=ECM
>     comment[6]: TOTALTRACKS=4
>     comment[7]: COMPOSERSORT=Jarrett, Keith
>     comment[8]: MUSICBRAINZ_ALBUMARTISTID=061c4920-3ea6-4835-98f6-
> 02f3b82f5e3a
>     comment[9]: COMPOSER=Keith Jarrett
>     comment[10]: DATE=1983
>     comment[11]: DISCNUMBER=1
>     comment[12]: TRACKTOTAL=4
>     comment[13]: MUSICBRAINZ_RELEASETRACKID=d4755323-4a9c-3edd-8794-
> dc846e7ad868
>     comment[14]: ASIN=B0000262WI
>     comment[15]: ALBUMARTISTSORT=Jarrett, Keith
>     comment[16]: ORIGINALDATE=1975-11-30
>     comment[17]: SCRIPT=Latn
>     comment[18]: MUSICBRAINZ_ALBUMID=43dd0b85-0f22-3fa4-80d8-e49c7310af83
>     comment[19]: RELEASESTATUS=official
>     comment[20]: ALBUMARTIST=Keith Jarrett
>     comment[21]: CATALOGNUMBER=ECM 1064 /65
>     comment[22]: ENGINEER=Martin Wieland
>     comment[23]: ALBUM=The Köln Concert
>     comment[24]: MUSICBRAINZ_ARTISTID=061c4920-3ea6-4835-98f6-02f3b82f5e3a
>     comment[25]: MEDIA=CD
>     comment[26]: RELEASETYPE=album
>     comment[27]: RELEASETYPE=live
>     comment[28]: ORIGINALYEAR=1975
>     comment[29]: ISRC=DEA097500010
>     comment[30]: DISCTOTAL=1
>     comment[31]: ARTIST=Keith Jarrett
>     comment[32]: MUSICBRAINZ_RELEASEGROUPID=516d4629-7bf3-3ac3-907a-
> ed9a022db840
>     comment[33]: MUSICBRAINZ_TRACKID=efa85037-66ba-4910-ab97-86124ea515f3
>     comment[34]: ARTISTSORT=Jarrett, Keith
>     comment[35]: ARTISTS=Keith Jarrett
>     comment[36]: TRACKNUMBER=1
>
>
> I have then checked the differences and here are the result:
>
> *Unique field present in Beets*:
>
>     comment[0]: ACOUSTID_FINGERPRINT=
>     comment[1]: ACOUSTID_ID=
>     comment[4]: ALBUMARTIST=Keith Jarrett
>     comment[5]: ALBUMARTIST_CREDIT=Keith Jarrett
>     comment[7]: MUSICBRAINZ_ALBUMCOMMENT=
>     comment[8]: MUSICBRAINZ_ALBUMSTATUS=Official
>     comment[9]: MUSICBRAINZ_ALBUMTYPE=live
>     comment[11]: ARTIST_CREDIT=Keith Jarrett
>     comment[14]: BPM=0
>     comment[16]: DESCRIPTION=
>     comment[17]: COMMENT=
>     comment[18]: COMPILATION=0
>     comment[19]: COMPOSER=
>     comment[22]: YEAR=1983
>     comment[23]: DISC=1
>     comment[25]: DISCSUBTITLE=
>     comment[27]: DISCC=1
>     comment[29]: ENCODEDBY=
>     comment[30]: ENCODER=
>     comment[31]: GENRE=
>     comment[32]: GROUPING=
>     comment[34]: PUBLISHER=ECM
>     comment[35]: LANGUAGE=eng
>     comment[36]: LYRICS=
>     comment[46]: TRACK=1
>     comment[49]: TRACKC=4
>
>
> *Unique fields present in Picard*:
>     comment[0]: BARCODE=042281006722
>     comment[1]: PRODUCER=Manfred Eicher
>     comment[7]: COMPOSERSORT=Jarrett, Keith
>     comment[9]: COMPOSER=Keith Jarrett
>     comment[13]: MUSICBRAINZ_RELEASETRACKID=d4755323-4a9c-3edd-8794-
> dc846e7ad868
>     comment[19]: RELEASESTATUS=official
>     comment[22]: ENGINEER=Martin Wieland
>     comment[26]: RELEASETYPE=album
>     comment[27]: RELEASETYPE=live
>     comment[28]: ORIGINALYEAR=1975
>     comment[29]: ISRC=DEA097500010
>     comment[35]: ARTISTS=Keith Jarrett
>
> Some considerations:
>
>    - There are more fields in beets than in Picard this is very good! I 
>    think that using all the Musicbrainz field is the goal here. 
>    - Some fields in Picard are not used in 
>    beets: BARCODE, PRODUCER, MUSICBRAINZ_RELEASETRACKID, ENGINEER, ISRC
>    - RELEASESTATUS is the vorbis jargon of MUSICBRAINZ_ALBUMSTATUS which 
>    is APEv2. Here I think beets could use the correct Vorbis Jargon not 
>    the APE one.
>    - COMPOSER and COMPOSERSORT are present in Picard left empty in Beets. 
>    This is strange... Maybe a bug ????
>    - RELEASETYPE is vorbis jargon (Picard), MUSICBRAINZ_ALBUMTYPE is APE2 
>    jargon. Beets maybe could use Vorbis instead of APE.
>    - Picard use two RELEASETYPE (Album + Live) Beets just one; actually 
>    dropping "Album". I don't which could be the correct one, maybe using both 
>    as indicated in MusicBrainz?
>    - ORIGINALYEAR is dropped in beets. There's a more 
>    complete ORIGINALDATE. And you can use $original_year in your path 
>    composition. Anyway could be worth to keep both for legacy software 
>    compatibility? 
>    - ARTISTS (plural) this is a strange Picard only field. Maybe is a 
>    list of artists if the release is a collection? I don't know.
>    
>
> What do you think about the analysis ? I really hope that this comparison 
> of mine will be useful to you for letting beets be the best tagging tool on 
> the web!
>
> Regards,
> Stefano Bossi
>
>
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