Philippe Gorley authored Dec 04, 2018 and Adrien Béraud committed Dec 05, 2018

Removes need for frame queue, as there's already an internal queue in
libavfilter. Once a frame is received, feed it directly to the filter.

The recorder's thread now only needs to send filtered frames to the
encoder.

Change-Id: I37bfa6e61f492cec120989fe210e92752e63466f