[FFmpeg-trac] #9301(undetermined:new): "-c copy" is very slow

[FFmpeg]

#9301: "-c copy" is very slow
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  ConcludingPrague                   |
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 ffmpeg -i input.m4a -c copy output.m4a

 Input file is 350MB, 6 hours.

 The old ffmpeg-20191214-24424a6-win64-shared.zip did it in 4 seconds:

 ffmpeg version git-2019-12-14-24424a6 Copyright (c) 2000-2019 the FFmpeg
 developers
 size=  357940kB time=06:17:43.92 bitrate= 129.4kbits/s speed=6.3e+03x


 While the newer git-2020-05-22-38490cb, 4.4-full_build-www.gyan.dev,
 n4.4-73-g7015704640 took 29 seconds!

 ffmpeg version n4.4-73-g7015704640 Copyright (c) 2000-2021 the FFmpeg
 developers
 size=  357940kB time=06:17:43.92 bitrate= 129.4kbits/s speed= 781x

 "-report -v 9 -loglevel 99" creates a huge log over 200MB

 Sample:
 https://www.youtube.com/watch?v=triXo_xCqms format 140 (AAC DASH)
 http://www.solidfiles.com/v/6GkdZme7kLQLD
 https://1fichier.com/?ukqq2zh0jm4yvd4iqapf
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9301>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker