Quote:
Originally Posted by Boulder
Has anybody made any recent tests with different CTU and TU sizes? I made a quick test yesterday on a 720p encode, and max CTU (and TU) 16 turned out to produce the smallest file but also looked best compared to the original frame. At CTU max 64, the frame was clearly more blurry in places where there were more small details such as hair etc.
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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.