Posts by filiphch

Quote from Klaartje

Hi, thanks for the replies!

I finally figured it out. It was your screenshot Klojum that pointed me to the right direction.

I noticed near 0% CPU load while you were playing the 8K test video. Whatever video I played, be it 1080p, 4K or something else, it always hovered around 70% CPU usage, but not from Kodi.bin, but Xorg instead. I also noticed this behavior when just sitting in some menus. When I switched the output to 1080p, all was fine. The CPU usage of Xorg immediately went down to near 0% CPU usage.

The problem turned out to be the Pioneer AVR. On the Pioneer Android app I noticed the input video source being sent was YCbCr 4:2:0, even though Kodi was configured to do Full RGB. The BD input on the AVR was not configured to do YCbCr 4:4:4 at 4k60, but 4:2:0 instead. Once I configured the input to do the full 4:4:4, LibreElec started sending me RGB Full video, which was then being converted to YCbCr 4:4:4 as output. Once I did this, the menu and all videos immediately went back to being smooth. CPU usage was around 20% while playing videos. Xorg was probably converting the framebuffer from one colorspace to another, causing the high CPU usage.

I couldn't resist to stop messing around to get it even further down. I ended up modifying my xorg.conf, with the following changes:

Code

Section "Screen"
    Identifier     "screen"
    Device         "nvidia"
    DefaultDepth    24
    Option         "ColorRange" "Full"
    Option         "ColorSpace" "YCbCr444"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

The input source being sent is YCbCr 4:4:4 now, so the AVR isn't converting the signal anymore. Better yet, the CPU usage is now below 10% average.

Thanks for putting me in the right direction guys!

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hey

I have exactly the same hardware sutup as you do, except the receiver, PC is hooked to al LG HDR TV ("deep color" enabled)

i tried to do what you did with this method of changing the xorg.conf:

https://openelec.tv/documentation/…ustom-xorg-conf

but it doesn't matter what i do everything still is shuttering

could you possibly explain more in detail what you did?

NV 1030 should be able to show every 4k in H265....

i had the same problem on my windows PC with mediaplayer classic and GTX970

i thought is was because 970 couldn't do the 4k h265, so i bougt the 1030. the problem stayed....

but then i indeed discovered the 4:2:2, 4:2:0, .... settings and even my 970 played all movies super smooth...

in kodi, i can't find the right settings...

but you did, please share them?