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Well, VP9 only has pframes still, afaik, so no problem.
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but x264 have I,P,B,b ... so screenshoot will always fails to make comparison.
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I deleted my samples, sadly, but VP9 was easily beaten by x264 visually (I tested a DVD source at 3 megabits to see if it will still have quality issues with that generous bitrate).
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Like say psnr or ssim ... ;-)
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The ratecontrol is probably faulty, select frames were even noticeably worse than VP8 with same settings.
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No problem with constant quantizer. Anyway the RC for VP9 seem not so bad (OPSNR higher in two pass mode than constant quantizer mode mean generaly good RC).