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

FFmpeg trac at avcodec.org
Tue Aug 25 21:17:29 CEST 2015


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

Comment (by LordHDL):

 New test with patch:
 https://www.dropbox.com/s/wbp01bcxhrrauxi/AVFTest.tar.xz?dl=0

 Ignore the registration prompt (click outside or the X), it's not needed
 to download.

 The source chosen is a recent PC game (not emulated, low CPU & GPU
 demands) so it runs at 60 FPS exactly as opposed to older standards like
 59.94.  Drops in smoothness are very obvious.  The patch does seem to help
 with the audio tempo issue I've experienced, however.  It doesn't seem to
 cut off or warp anymore.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4437#comment:23>
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