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

FFmpeg trac at avcodec.org
Thu Mar 9 02:27:35 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):

 Ah, I had used -acodec copy (which I assume is the same here as -c copy?)
 above in comment #2, but forgot it before.
 Still, the same results with that when I repeat it now:
 $ 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 -acodec copy -y a.mp3
 $ ffmpeg -i 17.mp3 -acodec copy -y b.mp3
 $ diff 16.mp3 a.mp3
 Binary files 16.mp3 and a.mp3 differ
 $ diff 17.mp3 b.mp3
 Binary files 17.mp3 and b.mp3 differ
 $ 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
 Binary files 16.mp3.wav and a.wav differ
 $ diff 17.mp3.wav b.wav
Ticket URL: <https://trac.ffmpeg.org/ticket/9755#comment:11>
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