[FFmpeg-trac] #8489(undetermined:reopened): MP4 file has too short audio

[FFmpeg]

#8489: MP4 file has too short audio
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             Reporter:  Michael      |                    Owner:  (none)
  Koch                               |
                 Type:  defect       |                   Status:  reopened
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Michael Koch):

 This example has the wrong audio output:

 ffmpeg -f lavfi -i testsrc2=size=vga -f lavfi -i sine=1000 -t 6 -y
 video.mp4
 ffmpeg -i video.mp4 -i video.mp4 -lavfi "amix=weights='1.0 0.1'" -y
 out.mp4

 But if I use a *.mov as input file, then it works:

 ffmpeg -f lavfi -i testsrc2=size=vga -f lavfi -i sine=1000 -t 6 -y
 video.mov
 ffmpeg -i video.mov -i video.mov -lavfi "amix=weights='1.0 0.1'" -y
 out.mp4

 Michael
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Ticket URL: <https://trac.ffmpeg.org/ticket/8489#comment:7>
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