One reason in addition to the non-grainy video is that the non-graded HDR image is so flat that it confuses the encoder. It means that you should test how it looks, the numbersmay deceive you. With HDR sources, I use CRF 14 while with SDR it's 18.
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And if the band you're in starts playing different tunes
I'll see you on the dark side of the Moon...
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