Add a new experiment SMOOTH_HV.
This experiment extends ALT_INTRA by adding two new modes: smooth horizontal and smooth vertical. Improvement on *intra frames* in BDRate (PSNR): =============================================== AWCY (high latency): -0.46% (Also, -1.0% or more on PSNR Cb,Cr and APSNR Cb,Cr). AWCY (low latency): -0.43% (Also, -0.88% to -0.94% on PSNR Cb,Cr and APSNR Cb,Cr). Google sets: lowres: -0.454 midres: -0.484 hdres: -0.525 Improvement on *video overall* in BDRate (PSNR): ================================================ AWCY (high latency): -0.15% Google sets: lowres: -0.085 midres: -0.079 Change-Id: I9f4e7c1b8ded1fe244c72838f336103ccc715d50
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