[FFmpeg-trac] #8137(undetermined:new): "Non-monotonous DTS in output stream" message and broken file when copying from h264/mp4 to mp4

[FFmpeg]

#8137: "Non-monotonous DTS in output stream" message and broken file when copying
from h264/mp4 to mp4
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             Reporter:  fireattack   |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by fireattack):

 The original file definitely has some issues in timestamp, but it plays
 fine in all the players I tested. The output, on the other hand, doesn't.
 It will just play a split of seconds.

 The problem also happens when remuxing to ts, mkv, or avi. (Interestingly,
 no "Non-monotonous DTS in output stream" spamming when converting to mkv).

 Transcoding it (simply removing {{{-c copy}}}) also resulted in broken
 file.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8137#comment:1>
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