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The difference which I found is with respect to preserving 'details' in the sense of replicating the source as closely as possible.
SSIM - as a quality metric adapted to human perception - seems to be pretty forgiving in this respect.
Inspecting individual frames, the NVEnc encodes looked like pre-filtered (de-noised) x264 encodes in my experience.
Fine details like textures of clothes are partially smoothed away (mainly in B-frames), and low contrast areas (e.g. dust or gravel in shady areas) look mashed.
One will however hardly notice this when watching the movie real-time (what a movie is supposed to be used for), and some viewers may subjectively even prefer the 'denoised' NVEnc version.
Hence SSIM seems to not penalize these losses unduly.
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See the same, Sharc. I am still asking PSNR for that reason, SSIM being called in by codec makers to soothe away codec's imperfections.
Many thanks for the continued development, jdobbs !
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