shithub: libvpx

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vp9: Adjust cyclic refresh parameters for low bitrates.

Increase the motion threshold and qp-delta for segment#2 boost.
This can increase the frame-drop at low bitrates, but generally
better spatial quality.

Only affects real-time mode with aq-mode=3, at very low bitrates.

Change-Id: I5ccb784667f70d0c27d369806b93b1f93d5605d1

--- a/vp9/encoder/vp9_aq_cyclicrefresh.c

+++ b/vp9/encoder/vp9_aq_cyclicrefresh.c

@@ -472,8 +472,8 @@

   }

   // Adjust some parameters for low resolutions at low bitrates.

   if (cm->width <= 352 && cm->height <= 288 && rc->avg_frame_bandwidth < 3400) {

-    cr->motion_thresh = 4;

-    cr->rate_boost_fac = 10;

+    cr->motion_thresh = 16;

+    cr->rate_boost_fac = 13;

   }

   if (cpi->svc.spatial_layer_id > 0) {

     cr->motion_thresh = 4;