[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):

 I'm on 10.10.2.  My CPU usage is around 15-18% while recording.  I have an
 i7 2720QM 2.2 GHz and a Radeon 6750M (MacBook Pro 8,2).  As I said in my
 notes, the drops don't happen when recording with ffmpeg in Windows on the
 same hardware.  On OS X the drops also happen when using huffyuv.

 Also I know I specified 60 FPS but this happens even if I don't use the
 `-framerate` option.  The recording defaults to 30 FPS and will still
 exhibit the intermittent drops.  The only time hardware appears to be a
 bottleneck is if I don't use the crop filter and record full screen.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4437#comment:6>
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