[FFmpeg-trac] #5075(undetermined:new): Duration of AAC file is wrong?

[FFmpeg]

#5075: Duration of AAC file is wrong?
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             Reporter:  d4eva        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 I think duration is an issue after all.
 I attached files to demonstrate it.

 8.wav and 9.wav are original ones.
 There should not be any gap in between (those are small pieces of tracks 8
 and 9 from Depeche Mode Violator).

 When I concatenate files 8.wav and 9.wav and then open resulting 10w.wav
 in Audacity I see that there's no gap in between, so this is OK. It sound
 fine as well.
 {{{
 ffmpeg -f concat -i ccw.txt  10w.wav
 }}}

 8.m4a and 9.m4a are ones created with FFmpeg.
 When I concatenate them like this and then open resulting 10.wav in
 Audacity I see that there is a gap in between. That can be heard as well.
 {{{
 ffmpeg -f concat -i cc.txt  10.wav
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/5075>
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