[FFmpeg-trac] #9755(undetermined:new): gapless playback of *some* MP3 files destroyed

FFmpeg trac at avcodec.org
Thu Mar 9 02:04:42 EET 2023

#9755: gapless playback of *some* MP3 files destroyed
             Reporter:  Christoph    |                    Owner:  (none)
  Anton Mitterer                     |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
Comment (by Christoph Anton Mitterer):

 You should have received a Google Drive link. (Please tell me once you no
 longer need the download.)

 What I do is basically:
 lame --verbose -q 0 -v -V 4 --noreplaygain --id3v2-utf16 --add-id3v2
 --id3v1-only 16.wav
 lame --verbose -q 0 -v -V 4 --noreplaygain --id3v2-utf16 --add-id3v2
 --id3v1-only 17.wav
 ffmpeg -i 16.mp3 a.wav
 ffmpeg -i 17.mp3 b.wav

 diff 16.mp3 a.mp3
 diff 17.mp3 b.mp3
 => both differ (but could of course be metadata)

 thus checking the decoded WAV:
 ffmpeg -i 16.mp3 16.mp3.wav
 ffmpeg -i 17.mp3 17.mp3.wav
 ffmpeg -i a.mp3 a.wav
 ffmpeg -i b.mp3 b.wav

 diff 16.mp3.wav a.wav
 => differ
 diff 17.mp3.wav b.wav
 => equal
Ticket URL: <https://trac.ffmpeg.org/ticket/9755#comment:8>
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