4K transcoding with Quattro P400 win 10

Plex Media Server Desktops & Laptops
1

Hi all

Just installed an Nvidia Quattro P400, working and transcoding 1080 rips no issue, if I try a 4K rip the house does not transcode and just uses CPU. I have latest nvidia drivers and latest version of plex, the odd thing is if I play the film on the machine itself it shows use of the gpu, if I try on ipad, shield etc it only uses cpu.
Any ideas, cheers Fergin

2

without logs, impossible to say.

what does the plex web dashboard show ?

do you have ‘tone mapping’ enabled? if so that will use the cpu on windows. you can disable tone mapping in the server settings.

3

Thanks for reply

I will try get some logs up, I generally don’t need to transcode 4K gigabit Ethernet throughout house but was interested to see what it was like and started bugging me when I couldn’t get it to work

Fergin

4

the plex dashboard will show you right away if the transcoding is using (hw) for both decoding/encoding video.

and check the tone mapping setting.

5

Thanks, turned tone mapping off, still seems to use cpu

I have just played a 1080p file, dashboard shows hw decoding, trying 4K file does not show hw decoding, I’ll see if I can get some logs up tomorrow, thanks for help

Fergin

6

Is the file 4k hevc or 4k h264? NVidia cards do not typically support 4k h264.

7

Thanks

Wasn’t aware of that I’ve tried multiple files with no success not sure I’ll have to check

Fergin

8

If you provide your PMS logs after trying to transcode a 4k file, I can look to see what’s going on.

9

Plex Media Server Logs_2021-03-13_12-04-26.zip (4.3 MB)

Hi

Just tried several files, and attached logs

Thank you

Fergin

10

Your logs show you still have tone-mapping enabled. Your GPU doesn’t appear to be able to handle the tone-mapping so it is reverting back to the CPU because of that.

11

Strange, sure I had the box unchecked, just looked again and still unchecked, I’ll try a reboot and see what happens

Cheers

Fergin

12

Seems to be working now

Thanks, strange not changed anything just restarted pc

Fergin

13

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