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

FFmpeg trac at avcodec.org
Sun Sep 27 14:28:39 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:  1
             Blocking:               |
Analyzed by developer:  0            |

Comment (by LordHDL):

 Correct, ScreenFlow seems to nail both frame and lossless RGB capture (too
 bad the export options suck).  The only other software I've used that gets
 frames right is Norichan, but that won't help much.  It's only usable with
 a certain capture device and was designed to record interlaced video so
 that the resulting deinterlaced encoding would be perfect.

 Some notable mentions, however:
 [http://cocoasplit.com/releases/coreimage.html CocoaSplit],
 [https://github.com/jp9000/obs-studio/releases OBS], and
 [http://syphon.v002.info/recorder/ Syphon Recorder].  All do exhibit some
 drops (Syphon Recorder has a similar problem to ffmpeg), but so far these
 are the best of the bunch that I've encountered.  As far as video capture
 (not recording), [http://camtwiststudio.com/ CamTwist] is also excellent.
 These are all free.  If you're looking to test Syphon Recorder a good
 complement to it would be [http://openemu.org/ OpenEmu], as it has Syphon
 output built-in.

Ticket URL: <https://trac.ffmpeg.org/ticket/4437#comment:27>
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