[Bug 747270] avfvideosrc: BUFFER_QUEUE_SIZE too small

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747270

--- Comment #18 from Ilya Konstantinov <ilya.konstantinov at gmail.com> ---
A more realistic workload:

  avfvideosrc device-index=0 !
  video/x-raw,width=1280,height=720,framerate=30/1 !
  queue !
  vtenc_h264 bitrate=400 !
  fakesink enable-last-sample=0

performs at ~26% (while pre-patch was 32%).

(Without the "queue !" we're getting constant frame drops in the AV capture
thread, as anticipated.)

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