shithub: libvpx

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vp9-rtc: Increase partition threshold to 8x8 for high Q

For low resolutions: increase the partition threshold
to split to 8x8 blocks for high Q.
Some improvement in quality for low bitrates at low resoln.

On rtc_derf speed 7: ~1.7 bdrate gain for low bitrates.

Change-Id: I1900c32497b75da4e8b882fedc8f4b440b017480

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -649,6 +649,10 @@

       thresholds[0] = threshold_base >> 3;

       thresholds[1] = threshold_base >> 1;

       thresholds[2] = threshold_base << 3;

+      if (cpi->rc.avg_frame_qindex[INTER_FRAME] > 220)

+        thresholds[2] = thresholds[2] << 2;

+      else if (cpi->rc.avg_frame_qindex[INTER_FRAME] > 200)

+        thresholds[2] = thresholds[2] << 1;

     } else if (cm->width < 1280 && cm->height < 720) {

       thresholds[1] = (5 * threshold_base) >> 2;

     } else if (cm->width < 1920 && cm->height < 1080) {