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Old 26th January 2022, 03:32   #7  |  Link
benwaggoner
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Join Date: Jan 2006
Location: Portland, OR
Posts: 4,750
Quote:
Originally Posted by Kill3rWolf View Post
From 9 samples, which one's looks better & worst? & why? Which one got more details & sharpness? Can you see/identify the difference between aq-mode=3 & aq-mode=4? If not, then why?
They are your samples, you get to decide which looks best!

Quote:
Is there any command-line error? which one? Anything missing?
--hevc-aq missing from command-line?
Don't use --hevc-aq. The goodness of that is included in --aq-mode 4.

Quote:
I don't why some last test results provided a low bit rate & file size compared to some 1st beginning tests.
Different modes have different bitrate allocation and rate control, so file sizes will be different. If you want to compare quality at a given file size, you should use 2-pass VBR encoding.

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I think & observe that limit-sao:selective-sao=1 works well when you are using a low CRF value. Even better than no-sao:selective-sao=0. But when you are increasing CRF value with limit-sao:selective-sao=1 it adds smoothness to the face & details lost.
SAO is good at reducing visible artifacts at the cost of some detail. If you're encoding with enough bits that you weren't getting artifacts without SAO, using it will lose detail.

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Guys, Does no-sao:selective-sao=0 have any playback issues? I mean ridiculously faster scene change compared to the source during fast movement.
It could have a minor improvement for software decoders (don't need to apply it on playback), but should have none for hardware decoders.

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no-sao:selective-sao=1
x265 [warning]: SAO turned ON when selective-sao is ON


But I saw that it provided slightly better than no-sao:selective-sao=0, I don't know the behind the reason.
selective-sao 0 is the same as no SAO. For your content, having SAO on IDR frames is helpful. Selective-sao 2 is often the sweet spot.

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--csv-log-level 2, the log file nowhere found.
You specify the file path with --csv

Lots of your questions are answered here: https://x265.readthedocs.io/en/master/cli.html
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