shithub: libvpx

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vp9: Adjust threshold for y sad used in copying partition.

Visual quality improvement is observed for noisy clips. Little effects
on speed tests on Nexus 6.

Change-Id: Ib38e04002220708c34102de7b5c36e9940775d89

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

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

@@ -531,9 +531,9 @@

       else if (cm->width <= 640 && cm->height <= 360)

         cpi->vbp_threshold_copy = 8000;

       else

-        cpi->vbp_threshold_copy = (cpi->y_dequant[q][1] << 4) > 16000

-                                      ? (cpi->y_dequant[q][1] << 4)

-                                      : 16000;

+        cpi->vbp_threshold_copy = (cpi->y_dequant[q][1] << 3) > 8000

+                                      ? (cpi->y_dequant[q][1] << 3)

+                                      : 8000;

     }

     cpi->vbp_threshold_minmax = 15 + (q >> 3);

   }