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README_COMPILATIONS.md

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forked-daapd and Compilation Albums

Compilation albums that have multiple artists can be handled in a number of ways such as a user specified metadata where album artist == Various Artists. However this approach does not allow forked daapd to group the tracks together in the web UI album view.

Automated metadata taggers such as MusicBrainz and CDDB can identify compliations and add an unique identifier which forked daapd can use over the album name when grouping.

Adding 'Compilation Tags'

Users can use any MusicBrainz enabled metadata tagger (such as Picard) to add the relevant tags to the compilation album's files OR users can manually add these compilation identifing tags using something like ffmpeg; the only requirement is that within the music library these compilation tags are unique.

forked daapd can use any of the the following metadata tag names (in ordre of preference) to store the compilation tag:

  • MusicBrainz Album Id
  • MusicBrainz DiscID
  • CDDB DiscID
  • MusicBrainz Release Group Id
  • CATALOGNUMBER
  • BARCODE"

ffmpeg can be used to manually add the tags if you do not wish to autotag

 ffmpeg -hide_banner -i input-basicmeta.mp3 -c copy -metadata "MusicBrainz Album Id"="va-someunique-value" output.mp3

Verfication can done via ffprobe for a manually updated file:

$ ffprobe -hide_banner -i output.mp3
Input #0, mp3, from 'output.mp3':
  Metadata:
    artist          : Marvin Gaye
    title           : Let's Get It On
    album           : The Motown Collection
    genre           : Pop
    MusicBrainz Album Id: va-someunique-value
    encoder         : Lavf58.12.100
  Duration: 00:04:53.98, start: 0.025057, bitrate: 251 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 251 kb/s
    Metadata:
      encoder         : LAME3.98r
    Side data:
      replaygain: track gain - -2.400000, track peak - unknown, album gain - unknown, album peak - unknown,

and similary for the same (CD ripped) file that was autotagged via MusicBrainz Picard

$ ffprobe -hide_banner -i marvin-gaye-letsgetiton.mp3
Input #0, mp3, from 'marvin-gaye-letsgetiton.mp3':
  Metadata:
    title           : Let's Get It On
    artist          : Marvin Gaye
    track           : 2/15
    album           : The Motown Collection (10 CD/1 DVD) Box set, Enhanced
    disc            : 7/11
    genre           : Pop
    compilation     : 1
    TMED            : CD
    TDOR            : 2008
    date            : 2008
    artist-sort     : Gaye, Marvin
    TSRC            : GBCBR0300006
    SCRIPT          : Latn
    album_artist    : Various Artists
    TSO2            : Various Artists
    TSST            : Volume 4, Disc 1
    ASIN            : B001BK4IUQ
    originalyear    : 2008
    publisher       : Time-Life Music/UMe
    Artists         : Marvin Gaye
    MusicBrainz Album Status: official
    MusicBrainz Album Type: album/compilation
    MusicBrainz Album Id: 389cb65e-87bc-4897-9c56-26a482c4e1d3
    MusicBrainz Artist Id: afdb7919-059d-43c1-b668-ba1d265e7e42
    MusicBrainz Album Artist Id: 89ad4ac3-39f7-470e-963a-56509c546377
    MusicBrainz Release Group Id: 6b2d3944-4bfa-46f2-ae44-18ffce2b32b2
    MusicBrainz Release Track Id: 935f9071-0b57-42a7-b3a2-50fa49e84039
  Duration: 00:04:53.98, start: 0.025057, bitrate: 252 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 251 kb/s
    Metadata:
      encoder         : LAME3.98r
    Side data:
      replaygain: track gain - -2.400000, track peak - unknown, album gain - unknown, album peak - unknown,