Plex for Windows lagging with HW on

Plex Players Desktop Players
1

When i play files like the type below i get only around 5 fps with HW acceleration on (client side settings) with direct play. Tried Make My GPU hurt to LowQ, no differents. When i turn off HW acceleration it plays smoothly still on direct play.
The GPU in Taskmanager only using 4% in 3D nothing else with H/W on and 9% when off 0% in Video Enc/Dec on both. CPU the same.
Lower Quality files plays fine. Higher then this i have not tested.
Do other people have the same result?

Hardware: 3700x. 32GB RAM. Nv 1080ti. 3840x1600 Screen HDR+G-Sync comp/active on run .
Software:
Client: W11 23H2. Plex For Widows v1.83.1.4061. Nvidia Driver v546.29
Server: Unraid with Plex Server (admin, linux docker): v1.32.8.7639

Metadata on File with low FPS:
Codec HEVC
Bitrate 18571 kbps
Bit Depth 10
Chroma Location topleft
Chroma Subsampling 4:2:0
Coded Height 2160
Coded Width 3840
Color Primaries bt2020
Color Range tv
Color Space bt2020nc
Color Trc arib-std-b67
Frame Rate 25 fps
Height 2160
Nivå 5.1
Profil main 10
Ref Frames 1
Width 3840
Display Title 4K HLG (HEVC Main 10)
Extended Display Title 4K HLG (HEVC Main 10)

2

You may want to try adjusting your NVIDIA settings (specifically when using this app). The default settings should work well. There have been other threads in these forums about the NVIDIA settings and how they affect playback.

3

Nvidia is on default settings and every other HDR10/hevc/h264/4k works fine. But HLG 10bit depth file doesn’t play good with HW on.
When i have Plex HW acc on client off and it still uses GPU you saying it is Nvidia problem? When i have it on it uses the GPU but with problem???
Tried the file with other players (VLC) and it worked 100%.

4

That’s not what I said. I was referencing the low frame rate. Rendering video to the display uses GPU resources especially if there is any kind of scaling or color space mapping.

Most players default to HW decoding off.

Sounds like your hardware or drivers has a problem with HLG.

5

It is not the GPU. I have tested now on a friends newer AMD GPU (6700xt) and Plex Windows and with same result. It’s Plex encoding who do not support HLG right and settings on the app.
Edit: Tested VLC with forced H/W on (Auto,DVXA2, 3D11 and Off), no change=worked perfect.

6

I don’t know what to tell you but content being HLG or not, it is given to the D3D11 API to decode/render. I’ve played HLG content before with lower power GPUs without issue.

7

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