[Bug 747270] avfvideosrc: BUFFER_QUEUE_SIZE too small

[GStreamer (GNOME Bugzilla)]

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

--- Comment #15 from Ilya Konstantinov <ilya.konstantinov at gmail.com> ---
Clarifying:

Increasing BUFFER_QUEUE_SIZE from 2 (to whatever) reduces CPU usage from 32% to
26% only on this pipeline:

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

On a simpler:

  avfvideosrc device-index=0 !
  video/x-raw,width=1280,height=720,framerate=30/1 !
  fakesink

the CPU usage was 19% and remains 19% after BUFFER_QUEUE_SIZE increase
(probably since the frame drop scenario never occurs).

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