[FFmpeg-trac] #7969(ffprobe:new): Flac tracknumber is incorrectly identified

[FFmpeg]

#7969: Flac tracknumber is incorrectly identified
-------------------------------------+-------------------------------------
             Reporter:  rayden       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  ffprobe      |                  Version:
             Keywords:  flac         |  unspecified
  metadata                           |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: track number is shown incorrectly for flac files.
 ffprobe shows tracknumber as track (lowercase), and track as TRACK
 (uppercase). Only using metaflac I realised the tags were different

 How to reproduce:
 Grab a good flac file, and then run:
 {{{
 $ ffprobe '02 - Angelica.flac'
 Input #0, flac, from '02 - Angelica.flac':
 Metadata:
 ALBUM : Eternity [Peaceville Records-Pony Canyon Inc PCCY-01050]
 TRACKTOTAL : 15
 ARTIST : Anathema
 PERFORMER : Anathema
 GENRE : "Doom metal"
 DATE : 1996
 TITLE : Angelica
 track : 02
 Duration: 00:05:50.40, start: 0.000000, bitrate: 809 kb/s
 Stream #0:0: Audio: flac, 44100 Hz, stereo, s16


 $ metaflac --list '02 - Angelica.flac'
 ...
 METADATA block #2
   type: 4 (VORBIS_COMMENT)
   is last: false
   length: 233
   vendor string: reference libFLAC 1.3.2 20170101
   comments: 8
     comment[0]: ALBUM=Eternity [Peaceville Records-Pony Canyon Inc
 PCCY-01050]
     comment[1]: TRACKNUMBER=02
     comment[2]: TRACKTOTAL=15
     comment[3]: ARTIST=Anathema
     comment[4]: PERFORMER=Anathema
     comment[5]: GENRE=Doom Metal
     comment[6]: DATE=1996
     comment[7]: TITLE=Angelica
 }}}


 Tracknumber is the correct tag that players use to identify, hence the
 following example is just for the purpose of showing the differences:
 {{{
 $ metaflac --set-tag=track=02 '02 - Angelica.flac'
 $ ffprobe -fflags +bitexact 02\ -\ Angelica.flac
 Input #0, flac, from '02 - Angelica.flac':
   Metadata:
     ALBUM           : Eternity [Peaceville Records-Pony Canyon Inc
 PCCY-01050]
     TITLE           : Angelica
     TRACKTOTAL      : 15
     ARTIST          : Anathema
     PERFORMER       : Anathema
     GENRE           : Doom Metal
     DATE            : 1996
     TRACK           : 02
   Duration: 00:05:50.40, start: 0.000000, bitrate: 809 kb/s
     Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
 }}}

 This is very confusing and I think the tracknumber should show as
 TRACKNUMBER (uppercase).
 It took me a good while initially to understand why the tags on my flac
 album were not being set correctly, and that was because I was using track
 as ffprobe was showing it.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7969>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker