HEVC "Subpixel refinement effort" = < 8 (ok), if = > 7 you get "1% cpu hang" (default mp4 Profile)

jmc

Active member
Was testing HEVC for quality and Profile settings.

Finally figured out that the "1% cpu hang" problem was the "Subpixel refinement effort" Advanced Profile setting.

(Default mp4 Profile with HEVC and a dvd mpg.)

Greater then 7 and and it hangs. 7 or less it finishes.
No other settings altered.

Did find that to my eyes the X264.mp4 was better quality then the HEVC.mp4 even with equal bitrate.
Rather disappointed.
Was hoping for the "half the bitrate equal quality" results.

Thanks,
jmc
 

Dan203

Senior Developer
Staff member
Did find that to my eyes the X264.mp4 was better quality then the HEVC.mp4 even with equal bitrate.
Rather disappointed.
Was hoping for the "half the bitrate equal quality" results.
Most of HEVCs improvements are designed for 4K/HDR and have little effect on lower resolutions. If you're encoding HD then HEVC might actually look a little worse.
 
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