This intends to correct the tendency that VP8 aggressively favors rate
on intra coded frames. Experiments tested different numbers in [0, 1]
and found 9/16 overall provided about 2-4% gains for all-intra coded
clips based on vpx-ssim metric. The impact on regular encoded clips
is much smaller but positive overall. Overall impact on psnr is also
positive even though very small.
Change-Id: If808553aaaa87fdd44691f9787820ac9856d9f8a
eob = d->eob;
/* Now set up a Viterbi trellis to evaluate alternative roundings. */
- /* TODO: These should vary with the block type, since the quantizer does. */
rdmult = (mb->rdmult << 2)*err_mult;
+ if(mb->e_mbd.mode_info_context->mbmi.ref_frame==INTRA_FRAME)
+ rdmult = (rdmult * 9)>>4;
+
rddiv = mb->rddiv;
best_mask[0] = best_mask[1] = 0;
/* Initialize the sentinel node of the trellis. */