[FFmpeg-trac] #3859(undetermined:new): mp4: start_time never zero

[FFmpeg]

#3859: mp4: start_time never zero
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             Reporter:  blacktrash   |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by blacktrash):

 Replying to [comment:1 cehoyos]:
 > Are external libraries like libx264 and libfaac necessary to reproduce
 this?

 1. The problem does not surface if I omit the audio track by {{{ffmpeg -i
 input -an test.mp4}}} with libx264
 2. With {{{-c:a aac}}} ffmpeg suggests to use an external library like
 libfaac - btw. the same problem happens with libfdk_aac - or {{{-strict
 -2}}}; with the latter there's less de-sync, and it's negative; but I
 don't want to use the native aac encoder anyway

 I would argue this is a muxer issue. Basically the result is longer by
 roughly one video frame. Therefore people well familiar with the original
 material and a fine ear and eye will notice a slight de-sync.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3859#comment:3>
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