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87b4453ec6
When an encoder exports sum-of-squared-differences information in encoded packets, print_report() will print PSNR information in the status line. However, * the code computing PSNR assumes 8bit 420 video and prints incorrect values otherwise; there are no issues on trac about this * only a few encoders (namely aom, vpx, mpegvideo, snow) export this information; other often-used encoders such as libx26[45] do not export this, even though they could This suggests that this feature is not useful and it is better to remove it rather than spend effort on fixing it.