shithub: libvpx

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Non-rd variance partition: Adjust logic for 32->16 force split.

Lower the threshold for splitting 32x32->16x16 based on average variance,
and add lower bound condition for this split to occur. This prevents
unneccassry splitting for areas with very low variance.

Change-Id: Ibeb33b3d993632c2019f296eb87ef3b7e3568189

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

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

@@ -923,7 +923,8 @@

       get_variance(&vt.split[i].part_variances.none);

       if (vt.split[i].part_variances.none.variance > thresholds[1] ||

           (!is_key_frame &&

-          vt.split[i].part_variances.none.variance > (3 * avg_16x16[i]) >> 2)) {

+          vt.split[i].part_variances.none.variance > (thresholds[1] >> 1) &&

+          vt.split[i].part_variances.none.variance > (avg_16x16[i] >> 1))) {

         force_split[i + 1] = 1;

         force_split[0] = 1;

       }