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vp8 denoising: add bias factor to zero_mv sse.

Change-Id: I95818754424e89f0d56c6d9c0c5709e6f84fa46a

--- a/vp8/encoder/denoising.c

+++ b/vp8/encoder/denoising.c

@@ -276,7 +276,11 @@

         MB_MODE_INFO saved_mbmi;

         MACROBLOCKD *filter_xd = &x->e_mbd;

         MB_MODE_INFO *mbmi = &filter_xd->mode_info_context->mbmi;

-        int sse_diff = zero_mv_sse - best_sse;

+        int sse_diff = 0;

+        // Bias on zero motion vector sse.

+        int zero_bias = 95;

+        zero_mv_sse = (unsigned int)((int64_t)zero_mv_sse * zero_bias / 100);

+        sse_diff = zero_mv_sse - best_sse;

         saved_mbmi = *mbmi;

-- 

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