[FFmpeg-trac] #10995(undetermined:new): MP3 stream not copied *losslessly* with `-c:a copy`

FFmpeg trac at avcodec.org
Sat May 4 16:19:15 EEST 2024


#10995: MP3 stream not copied *losslessly* with `-c:a copy`
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  TheBigBadBoy                       |
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  6.1.1
  undetermined                       |
             Keywords:  MP3          |               Blocked By:
  lossless copy                      |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: When copying MP3 streams to a new file, the MP3 stream
 in the decoded new file does not match the input one (streamhash).
 How to reproduce:
 {{{
 % ffmpeg -i stripped.mp3 -c:a copy out.mp3
 % ffmpeg -v warning -i stripped.mp3 -f streamhash -
 0,a,SHA256=ab1e0a0724ec4fae47c483073550723c74ad29bf6b79a93fc0861c0603ffdec4
 % ffmpeg -v warning -i out.mp3 -f streamhash -
 0,a,SHA256=7deac27714db19d69767c196b3d2a728e2c5dc3291351f117e5cf01b952ff16b


 ffmpeg version n6.1.1 Copyright (c) 2000-2023 the FFmpeg developers
 built with gcc 13.2.1 (GCC) 20230801
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10995>
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