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Old 15th October 2017, 04:26   #1  |  Link
SZGY
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Join Date: Mar 2003
Posts: 8
x265 8 vs 10 bit quality issues

Hello,

I've started to experiment with x265 recently and using info that used to apply to x264, I thought it would be better to go for 10 bit in order to avoid banding and get better compression efficiency.

However, the results were not as expected. While output file sizes don't differ much, the 10 bit encode has visible detail loss and weird artifacts. See attached image + screenshot comparison.

Am I doing something wrong in the encoding process? Would I need to feed the 10 bit encoder 10 bit video data in the first place?

http://screenshotcomparison.com/comparison/120725

x265 Built 2017-10-14:
64Bit-8bit-(3883b374b58d93e707971d93b37eb931)
64Bit-10bit-(411b3fca92fc7e922d1aea8522c17088)

ffmpeg-20170921-183fd30-win64-static

Code:
loadplugin("DGDecodeNV.dll")
dgsource("P1080573.dgi")
trim(583,819)
BicubicResize(1920,1080,-1,0)
Code:
ffmpeg -i test3.avs -f yuv4mpegpipe - | x265-10 --y4m - -o test10.265
Source file:
https://mega.nz/#!Ik50gKDZ!5MwTMw8vR...xa0Ao4svIOCj4E
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