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

FFmpeg trac at avcodec.org
Wed Nov 11 18:31:39 CET 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):

 As per Thilo's request I'm posting my test results for his mirror here.
 This is what I got:
 https://www.dropbox.com/s/apkdhi4liixgdl8/avf2.tar.xz?dl=0

 Full console outputs included in the archive.

 Some observations:

 * Recording now forces my device's sample rate to max, which is 192,000
 Hz.  I'm using Soundflower (2ch) for audio and usually leave it at 48,000.
 * Audio is just all static, probably due to the sample rate thing,
 although when I use `-ar 48000` it's still static.
 * The audio/video queue warning messages are gone.
 * Frame rate capture seems unaffected.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4437#comment:29>
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