NVENC HEVC Fails to adjust recording configuration correctly when primary gpu is integrated graphics.

Operating System Info

Windows 10

Other OS

No response

OBS Studio Version

30.1.0

OBS Studio Version (Other)

No response

OBS Studio Log URL

https://obsproject.com/logs/MXv8OYdbRqrdf6Cl

OBS Studio Crash Log URL

No response

Expected Behavior

In Windows' settings I can choose between "Power Saving" and "High Performance" to force the OBS GUI to run on the integrated or dedicated cards. I prefer the gui on the iGPU as it makes DXGI Desktop capture work correctly.

I would expect either choice to have no effect on video capture.

Current Behavior

The Nvidia 1050 seemingly has some specific requirements about HEVC capture.

• Psycho Visual Tuning is disabled
• Max B-Frames are set to 0

When the gui (obs64.exe) is running on the 1050 NVENC capture works fine by adjusting to these settings automatically if the user's configuration is incorrect. (Log: here)

However, when the gui is on the igpu with NVENC HEVC active, B-Frames are not adjusted to 0 if the user's settings are misconfigured. This throws an "Unsupported Device" error. (Log: here)

Steps to Reproduce

1. Use the default Advanced Recording NVENC HEVC settings
2. Launch OBS on the iGPU (Windows' "Graphics Performance Preference" for obs64.exe set to "Power Saving")
3. Try record. It should fail.
4. Relaunch OBS on the dGPU (windows graphics on "High Performance")
5. Try record. It will succeed (by silently modifying the settings - see the logs)
   ...
   This might require specific hardware as seen below.

Anything else we should know?

My laptop's configuration is as follows:

• intel i5-8250u w/UHD 620 iGPU which governs the primary display (driver 31.0.101.2127)
• gtx 1050 dedicated gpu (gameready driver 551.76)
• Windows 10.0.19045
• OBS is being run as administrator

Start by comparing the linked OBS logs for the integrated-GPU and dedicated-GPU launches, then reproduce the NVENC HEVC recording failure using the listed Windows graphics settings and hardware configuration. Done means recording succeeds when OBS runs on the iGPU, without the unsupported-device error, while the required HEVC settings are applied consistently.