Quote:
Originally Posted by Boulder
Tests with 4K and 1080p encodes also showed the same behaviour. It's quite strange as it's said that the big thing in HEVC is that it can use larger CTUs than AVC to increase efficiency and that the bigger the CTU is, the less bitrate should be required. It doesn't seem to be like this at least in CRF mode. Too bad it's not allowed to use 16x16 CTUs with 1080p or 4K encodes if they are to be compliant.
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It would be helpful to see the command line used, or at least bitrate/CRF.
Larger CTUs are definitely helpful at lower bitrates. Comparing at high perceptual quality can bring in other subtler differences between modes.
I've even been able to see a slight improvement at sub-SD resolutions using CTU 64 at very low bitrates.