shithub: libvpx

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Film mode: Raise threshold for intra modes

Substantially increase the threshold for applying variance
adjustment in  rd_variance_adjustment() for intra modes
only, especially for DC_PRED.

Change-Id: Idb3f0c5aca5ab58c9b79c3e993247719054d79c9

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -3171,6 +3171,11 @@

       double noise_factor =

           (double)cpi->twopass.gf_group.group_noise_energy / SECTION_NOISE_DEF;

       low_var_thresh = (unsigned int)(low_var_thresh * noise_factor);

+

+      if (ref_frame == INTRA_FRAME) {

+        low_var_thresh *= 2;

+        if (this_mode == DC_PRED) low_var_thresh *= 5;

+      }

     }

   } else {

     low_var_thresh = LOW_VAR_THRESH / 2;