[Opalvoip-user] H.264 (libx264.so.67) encoder latency

[Rodrigo V. R. <rod...@gm...>]

Hello list,

I have experienced >1s of encoding latency using H.264 with libx264.so.67 on
a 4 core / 8 thread machine.
I fixed the latency by changing the number of encoding threads to 1 in
H.264/gpl/enc-ctx.cxx.

 _context.i_threads = 1; // was =0 (auto detected)

The result was satisfactory with h264_pwplugin_helper using ~24% cpu to
encode 640x480 at 30fps and no perceptive latency.
This problem occurs because the total encoding latency is a multiple of the
number of concurrent threads being used.