[FFmpeg-trac] #4676(undetermined:new): Concat of AAC + MP4 has gaps

[FFmpeg]

#4676: Concat of AAC + MP4 has gaps
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             Reporter:  ronag        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 ffmpeg -i big_buck_bunny.mp4 -ss 8 -to 10 -vn -c:a libfdk_aac 1.mp4
 ffmpeg -i big_buck_bunny.mp4 -ss 10 -to 12 -vn -c:a libfdk_aac 2.mp4

 touch list.txt
 printf "file 1.mp4\nduration 2\nfile 2.mp4\nduration 2" > list.txt
 ffplay -f concat -i list.txt

 This problem seems to occur with most audio codecs/formats except for
 pcm_s16le + wav.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4676>
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