Quote:
Originally Posted by jdobbs
One other point. There's also the option to choose the fastest speed for X265 in BD-RB. My guess would be that it is similar to hardware encoding in quality …..
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Out of curiosity I made a quality comparison between cartman's QP24 HW encode and a BD-RB x265 'Very Good (Very Fast)' CPU encode at same bitrate (about 7740 kbps).
- cartman's HEVC QP24 GPU encode: VMAF = 95.7191, SSIM = 0.997884, PSNR = 49.1751
- BD-RB x265 'Very Good (Very Fast)' CPU encode: VMAF = 96.3585, SSIM = 0.997893, PSNR = 49.4838 (CPU encoding speed was about 9 fps with my i5-8400 CPU)
No big difference in the quality metrics, both encodes are softening and denoising the picture somewhat.
Visually they look much the same IMO, by far good enough for casual viewing (a very subjective statement of course
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So the GPU HEVC encode has about the same quality as the CPU x265 'Very Good / Very Fast' encode in this test.