6dd6ffb0bb
We used to calculate SSIM only over the postproc buffer, whereas we calculate PSNR for both. Compared to postproc-SSIM, this is about 0.3% higher for derf, 1.4% lower for hd and 0.5% lower for stdhd, although it is highly variable on a per-clip basis. Change-Id: I8dd491f0f5b4201dedfb15d288c854d5d4caa10f