Thanks for the update.
For MS-SSIM is that just the arithmetic mean of the scores of each frame? I worry that makes rate control matter a lot less, since quality variability can be a huge problem, but not captured by mean-of-frames metrics.
Also, what a medium preset means can vary a lot between vendors. A useful alternative view would be looking at quality at fixed cost (time or $).
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Ben Waggoner
Principal Video Specialist, Amazon Prime Video
My Compression Book
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