[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:  avfoundation  |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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Comment (by LordHDL):

 Here's a test without the `-vf` option:
 https://www.dropbox.com/s/a982jatnw7n6d45/nofilter.tar.xz?dl=0

 I didn't include the lossless recording since, even compressed via xz, my
 connection is far too slow to upload within a reasonable time.  But you
 can get the idea from the encoded video and included Terminal outputs.
 I'm actually surprised the recording is using that much CPU.  I thought
 lossless was supposed to be more taxing on disk write speed, while
 compression depends more on CPU?

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Ticket URL: <https://trac.ffmpeg.org/ticket/4437#comment:7>
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