We use a wide variety of metrics to compare codecs, not just the usual PSNR metric: https://arewecompressedyet.com/?job=av1_rt_ctrl_new_twitch%402016-12-20T09%

We use a wide variety of metrics to compare codecs, not just the usual PSNR metric: https://arewecompressedyet.com/?job=av1_rt_ctrl_new_twitch%402016-12-20T09%3A23%3A43.974Z https://arewecompressedyet.com/?job=av1_rt_ctrl_new_twitch%4... While none of these metrics are as good as the "human quality" metric, some are better than others, in different ways, so we try to optimize across the board.