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

FFmpeg trac at avcodec.org
Tue Aug 25 14:55:10 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 thilo.borgmann):

 Thanks for your patch, mateo!

 If you extend your buffer size to way bigger than 4 frames you should be
 able to see if your assumptions are correct and we just do not consume the
 frames fast enough (and your buffer warning occurs later).

 Otherwise, if there is something out of sync on the system-side, your
 buffering extension could be useless and memory requirements raise. In
 that case we have to figure out if we can somehow acquire these missing
 frames in any way or if we don't even have a chance.

 I'm eager to hear feedback on the patch from LordHDL.

Ticket URL: <https://trac.ffmpeg.org/ticket/4437#comment:14>
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