shithub: libvpx

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Bias against non-zero mv for large blocks.

Change is only for real-time mode, speed > 5, and non-screen content mode.
Bias is based on block size and motion vector level (motion above some threshold).

Helps to improves stability in background from lightning changes.
PSNR/SSIM metrics on RTC set almost no change/neutral (within +/- 0.1).

Change-Id: I7eac13c1ae10be4ab1f40acc7f9f1df5653ece9d

--- a/vp9/encoder/vp9_pickmode.c

+++ b/vp9/encoder/vp9_pickmode.c

@@ -1477,6 +1477,20 @@

     this_rdc.rate += ref_frame_cost[ref_frame];

     this_rdc.rdcost = RDCOST(x->rdmult, x->rddiv, this_rdc.rate, this_rdc.dist);

+    // Bias against non-zero (above some threshold) motion for large blocks.

+    // This is temporary fix to avoid selection of large mv for big blocks.

+    if (cpi->oxcf.speed > 5 &&

+        cpi->oxcf.content != VP9E_CONTENT_SCREEN &&

+        (frame_mv[this_mode][ref_frame].as_mv.row > 64 ||

+        frame_mv[this_mode][ref_frame].as_mv.row < -64 ||

+        frame_mv[this_mode][ref_frame].as_mv.col > 64 ||

+        frame_mv[this_mode][ref_frame].as_mv.col < -64)) {

+      if (bsize == BLOCK_64X64)

+        this_rdc.rdcost = this_rdc.rdcost << 1;

+      else if (bsize >= BLOCK_32X32)

+        this_rdc.rdcost = 3 * this_rdc.rdcost >> 1;

+    }

+

     // Skipping checking: test to see if this block can be reconstructed by

     // prediction only.

     if (cpi->allow_encode_breakout) {