NVENC GL/VK DXGI present behaviour.

[TheAllTinker]

Is there an existing issue for this?

• I have searched the existing issues

Is your issue described in the documentation?

• I have read the documentation

Is your issue present in the latest beta/pre-release?

This issue is present in the latest pre-release

Describe the Bug

I've enabled the option "Present OpenGL/Vulkan on top of DXGI" under NVENC, since many of the games I want to stream use Vulkan. With current/pre-release versions of Sunshine, the relevant nVidia option is enabled immediately upon startup - regardless if any streaming is taking place.

Unfortunately, this option causes horrible flickering issues in a lot of OpenGL-based software just in regular (non-streaming) use of the machine - for instance Davinci Resolve and KiCad. I can of course just quit Sunshine, and the option is returned to "Auto" as expected, but I believe a better solution (if possible) would be to alter the option as streaming begins and ends instead. There's no need for the option to be on otherwise, especially since it apparently causes pretty severe issues.

Expected Behavior

No response

Additional Context

No response

Host Operating System

Windows

Operating System Version

Windows 10 Pro 22H2 19045.3324

Architecture

amd64/x86_64

Sunshine commit or version

2025.1027.181930

Package

Windows - installer (recommended)

GPU Type

NVIDIA

GPU Model

3070 Ti

GPU Driver/Mesa Version

581.57

Capture Method

Desktop Duplication API (Windows)

Config

av1_mode = 1
encoder = nvenc
hevc_mode = 1
min_log_level = 3
notify_pre_releases = enabled
sunshine_name = Main PC

Apps

Relevant log output

N/A

[ns6089]

You can override this option for problematic software:

In my opinion toggling this option on stream start/end is not a feasible default as these options are applied on 3d library initialization and any vulkan/opengl game launched before the stream will not get streamed at full rate.

[TheAllTinker]

That's another good workaround - but to clarify, what I mean is that the option could be applied only as a client connects (before any streaming or program launching occurs), and restored after the client disconnects and Sunshine returns to an idle state.

It may still not be feasible for reasons I'm not aware of; I just wanted to be clear about what I'm suggesting.