[FFmpeg-trac] #3799(avformat:new): non Vorbis comment tags in flac appear to be appended

[FFmpeg]

#3799: non Vorbis comment tags in flac appear to be appended
-------------------------------------+-------------------------------------
               Reporter:  llogan     |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  important  |              Component:  avformat
                Version:  git-       |               Keywords:  flac
  master                             |  regression
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 Regression since 0dc6655. Expected behavior is to not append non-Vorbis
 comment metadata.

 Vorbis comment is the only officially supported tagging mechanism in
 FLAC^[1]^. FLAC files containing (at least) ID3v2 with Vorbis comments may
 cause multiple metadata values per metadata key to be displayed resulting
 in ugly metadata.

 Silent sample `id3v2_vorbiscomment.flac`, apparently created with EAC^[2]^
 and containing ID3v2 with Vorbis comments, attached to this bug report.

 {{{
 $ ./ffmpeg -i id3v2_vorbiscomment.flac
 ffmpeg version N-64948-g8b59ab1 Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Jul 23 2014 17:15:34 with gcc 4.9.1 (GCC)
   configuration:
   libavutil      52. 92.101 / 52. 92.101
   libavcodec     55. 69.100 / 55. 69.100
   libavformat    55. 49.100 / 55. 49.100
   libavdevice    55. 13.102 / 55. 13.102
   libavfilter     4. 11.102 /  4. 11.102
   libswscale      2.  6.100 /  2.  6.100
   libswresample   0. 19.100 /  0. 19.100
 Input #0, flac, from 'id3v2_vorbiscomment.flac':
   Metadata:
     TOTALTRACKS     : 14
     ALBUM           : Meteora;Meteora
     DATE            : 2003;2003
     encoded_by      : Exact Audio Copy   (Burst rezim)
     encoder         : FLAC.EXE -6 -V -T "ARTIST=Linkin Park" -T
 "TITLE=Numb" -T "ALBUM=Meteora" -T "DATE=2003" -T "TRACKNUMBER=13" -T
 "GENRE=Alternative Metal" -T "COMMENT=" -T "BAND=" -T "ALBUMARTIST=" -T
 "COMPOSER=" -T "DISCNUMBER=1" -T "TOTALDISCS=1" -T "TOTALTRACKS=14" -o
     ARTIST          : Linkin Park;Linkin Park
     TLEN            : 339520
     GENRE           : Alternative Metal;Alternative Metal
     disc            : 1
     TOTALDISCS      : 1
     TITLE           : Numb;Numb
     track           : 13
   Duration: 00:00:03.58, start: 0.000000, bitrate: 269 kb/s
     Stream #0:0: Audio: flac, 44100 Hz, stereo, s32
 At least one output file must be specified
 }}}

 {{{
 $ metaflac --list id3v2_vorbiscomment.flac
 METADATA block #0
   type: 0 (STREAMINFO)
   is last: false
   length: 34
   minimum blocksize: 4608 samples
   maximum blocksize: 4608 samples
   minimum framesize: 16 bytes
   maximum framesize: 4866 bytes
   sample_rate: 44100 Hz
   channels: 2
   bits-per-sample: 24
   total samples: 157696
   MD5 signature: 67289117105966398bcf8a9f7ed4077a
 METADATA block #1
   type: 4 (VORBIS_COMMENT)
   is last: false
   length: 182
   vendor string: Lavf55.46.100
   comments: 9
     comment[0]: TOTALDISCS=1
     comment[1]: TOTALTRACKS=14
     comment[2]: Album=Meteora
     comment[3]: Artist=Linkin Park
     comment[4]: Genre=Alternative Metal
     comment[5]: Title=Numb
     comment[6]: DISCNUMBER=1
     comment[7]: DATE=2003
     comment[8]: TRACKNUMBER=13
 METADATA block #2
   type: 1 (PADDING)
   is last: true
 }}}

 {{{
 $ id3v2 -l id3v2_vorbiscomment.flac
 id3v1 tag info for id3v2_vorbiscomment.flac:
 Title  : Numb                            Artist: Linkin Park
 Album  : Meteora                         Year: 2003, Genre: Unknown (255)
 Comment:                                 Track: 13
 id3v2 tag info for id3v2_vorbiscomment.flac:
 TALB (Album/Movie/Show title): Meteora
 TPE1 (Lead performer(s)/Soloist(s)): Linkin Park
 TPOS (Part of a set): 1/1
 TENC (Encoded by): Exact Audio Copy   (Burst rezim)
 TSSE (Software/Hardware and settings used for encoding): FLAC.EXE -6 -V -T
 "ARTIST=Linkin Park" -T "TITLE=Numb" -T "ALBUM=Meteora" -T "DATE=2003" -T
 "TRACKNUMBER=13" -T "GENRE=Alternative Metal" -T "COMMENT=" -T "BAND=" -T
 "ALBUMARTIST=" -T "COMPOSER=" -T "DISCNUMBER=1" -T "TOTALDISCS=1" -T
 "TOTALTRACKS=14" -o
 TCON (Content type): Alternative Metal (255)
 TLEN (Length): 339520
 TIT2 (Title/songname/content description): Numb
 TRCK (Track number/Position in set): 13/14
 TYER (Year): 2003
 }}}

 [1] http://xiph.org/flac/format.html#format_overview
 [2] http://ffmpeg.zeranoe.com/forum/viewtopic.php?f=7&t=2072

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3799>
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