[FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
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             Reporter:  LordHDL      |                    Owner:  mateo
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:  avdevice
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
  avfoundation bounty                |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by LordHDL):

 Came across something curious in a recent test.  I did a lossless RGB
 recording at 720p and when played back in ffplay the FPS doesn't seem
 smooth (as much as usual, anyway).  However when played back in VLC it
 seems fine.  Still has the intermittent drops but the rest was smooth.
 Here's an example:
 https://www.dropbox.com/s/du4bxjltwi0uae3/720p60.mkv?dl=0

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Ticket URL: <https://trac.ffmpeg.org/ticket/4437#comment:39>
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