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Originally Posted by hajj_3
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Is there more documentation on what's actually being tested and graphed here? Based on the parameters, it doesn't appear to be controlled for encoding speed. And odd to use --tune ssim for x264/x265 for VMAF, which is a superior objective metric than SSIM.
I wish tests would provide the actual per-frame VMAF scores instead of just a mean. For real-world duration stuff, variability of quality can hurt subjective quality in a way that VMAF itself won't capture. Keyframe strobing on one frame every 5 seconds doesn't drag down the mean much, but it can be a very annoying artifact viewers can clap along to.