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Old 11th September 2018, 18:45   #6362  |  Link
brumsky
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Join Date: Jun 2016
Posts: 116
Quote:
Originally Posted by katzenjoghurt View Post
Hi guys,

I'm currently trying to convert Star Wars Episode III to x265... and hell... it's a beast.
This movie gives me super ugly artifacts in dark scenes.

Original: https://i.imgur.com/PA9cWuR.png
Encoding: https://i.imgur.com/HpVbyf4.png (with meagre 2,300kb/s in that scene, 4,500kb/s on avg for the whole movie)

My settings were: --crf 23 --tune grain --profile main12 --output-depth 12 --rskip --qcomp 0.8 --no-open-gop --no-deblock --no-strong-intra-smoothing

I already tried aq-mode 3 but to retain an okayish quality I had to set the aq-strength to 1.5 and ended up with 12 mbit/s for this scene.
I then tried aq-strength 3 and ended up with with perfect quality... and wopping 43 mbit /s.

Why are dark scenes so much more costly than brighter scenes?
This does not feel right...
What can I do?
To me it looks like your PSY values are set very high. That could be an effect of tune grain though. Have you tried it without tune grain? Maybe take tune grain out and try playing with the PSY values. I've found aq-mode 3 to work well but it needs a bit high bit rate to help it. When I use aq-mode 3 I try to set the strength setting between .85-1, then up the bit rate as needed to reach my target quality.
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