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Old 20th August 2020, 16:53   #1  |  Link
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X265 on 4k blurays, tunes, bitrate and blurring

Im trying to get transparent encodes of 4k blurays, and im not too sure on what tune to use, i use film for x264 on 1080p blurays but there isnt a film tune for x265.

I did some testing with the ssim tune to get a benchmark of quality, but i wont be using ssim for my actual encodes for obvious reasons. I also want to avoid the blurring that x265 usually cause, though not too sure if 4k content suffers as much from that as 1080p.

What tune should i start off with and what settings should i adjust further? Most of my content is similar, the stuff that would benefit from the film grain with the odd, very modern, photorealistic animation.

Also, how will this tune affect bitrate compared to no tune? And how should i adjust the crf? I use 16 atm, so for example, of it increases bitrate by 20%, how many points should i increase crf by to keep it inline with my target.
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Old 20th August 2020, 20:09   #2  |  Link
Join Date: Apr 2009
Location: North Europe
Posts: 556
--tune film is nothing special (--deblock -1:-1 --psy-rd <unset>:0.15), so you can set it yourself in x265 (I normally prefer --deblock -2:-2 for film though, but default deblock is OK for anime).
Explanation of x264 tune:
--tune <string> Tune the settings for a particular type of source
or situation
Overridden by user settings.
Multiple tunings are separated by commas.
Only one psy tuning can be used at a time.
- film (psy tuning):
--deblock -1:-1 --psy-rd <unset>:0.15
- animation (psy tuning):
--bframes {+2} --deblock 1:1 --psy-rd 0.4:<unset> --aq-strength 0.6 --ref {Double if >1 else 1}
- grain (psy tuning):
--aq-strength 0.5 --no-dct-decimate --deadzone-inter 6 --deadzone-intra 6 --deblock -2:-2 --ipratio 1.1 --pbratio 1.1 --psy-rd <unset>:0.25 --qcomp 0.8
- stillimage (psy tuning):
--aq-strength 1.2 --deblock -3:-3 --psy-rd 2.0:0.7
- psnr (psy tuning):
--aq-mode 0 --no-psy
- ssim (psy tuning):
--aq-mode 2 --no-psy
- fastdecode:
--no-cabac --no-deblock --no-weightb --weightp 0
- zerolatency:
--bframes 0 --force-cfr --no-mbtree --sync-lookahead 0 --sliced-threads --rc-lookahead 0

Last edited by Forteen88; 20th August 2020 at 20:12.
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2160p, bitrate, staxrip, tune, x265

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