Quote:
Originally Posted by Boulder
.. so it looks like VMAF cannot measure the difference between the clips accurately enough.
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There's also this issue where the VMAF result is skewed by a component 'motion2=0' score for the first frame in a clip:
https://forum.doom9.org/showthread.p...61#post1864561
The only information I can find about this parameter is:
"Motion. This is a simple measure of the temporal difference between adjacent frames. This is accomplished by calculating the average absolute pixel difference for the luminance component."
https://medium.com/netflix-techblog/...c-653f208b9652
and:
"motion2 score typically ranges from 0 (static) to 20 (high-motion)"
https://github.com/Netflix/vmaf/blob...hon_library.md
Testing your Blacksails clip against itself, with VapourSynth VMAF v3 (Model=0) gives:
Code:
<params model="" scaledWidth="1920" scaledHeight="1080" subsample="1" num_bootstrap_models="0" bootstrap_model_list_str="" />
<fyi numOfFrames="8" aggregateVMAF="99.6711" aggregatePSNR="60" aggregateSSIM="0.99993" aggregateMS_SSIM="0.999936" execFps="2.27555" timeTaken="3.51563" />
<frames>
<frame frameNum="0" adm2="1" motion2="0" ms_ssim="0.999889" psnr="60" ssim="0.9999" vif_scale0="0.999999" vif_scale1="0.999997" vif_scale2="0.999995" vif_scale3="0.999995" vmaf="97.4274" />
<frame frameNum="1" adm2="1" motion2="51.9751" ms_ssim="0.999997" psnr="60" ssim="0.999997" vif_scale0="0.999999" vif_scale1="0.999998" vif_scale2="0.999997" vif_scale3="0.999997" vmaf="100" />
<frame frameNum="2" adm2="1" motion2="45.4778" ms_ssim="0.999998" psnr="60" ssim="0.999999" vif_scale0="0.999999" vif_scale1="0.999998" vif_scale2="0.999996" vif_scale3="0.999998" vmaf="100" />
<frame frameNum="3" adm2="1" motion2="45.4778" ms_ssim="0.999994" psnr="60" ssim="0.999995" vif_scale0="0.999997" vif_scale1="0.999994" vif_scale2="0.999994" vif_scale3="0.999994" vmaf="100" />
<frame frameNum="4" adm2="1" motion2="48.0867" ms_ssim="0.99986" psnr="60" ssim="0.999837" vif_scale0="0.999999" vif_scale1="0.999996" vif_scale2="0.999995" vif_scale3="0.999995" vmaf="100" />
<frame frameNum="5" adm2="1" motion2="71.4518" ms_ssim="0.999999" psnr="60" ssim="0.999999" vif_scale0="1" vif_scale1="0.999999" vif_scale2="0.999998" vif_scale3="0.999998" vmaf="100" />
<frame frameNum="6" adm2="1" motion2="74.8847" ms_ssim="0.999751" psnr="60" ssim="0.999716" vif_scale0="0.999994" vif_scale1="0.999994" vif_scale2="0.999994" vif_scale3="0.999994" vmaf="100" />
<frame frameNum="7" adm2="1" motion2="74.8847" ms_ssim="1" psnr="60" ssim="1" vif_scale0="0.999998" vif_scale1="0.999995" vif_scale2="0.999993" vif_scale3="0.999994" vmaf="100" />
FFMPEG SSIM reports lossless, 1.00000 (Inf)