Sunshine
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LizardByte
Unable to capture FPS faster than refresh rate
Is there an existing issue for this?
- [X] I have searched the existing issues
Is your issue described in the documentation?
- [X] I have read the documentation
Is your issue present in the nightly release?
- [X] This issue is present in the nightly release
Describe the Bug
Say a game is consistently running at X fps (higher than Y and Z), Sunshine is asked to deliver Y fps, which is higher than monitor refresh rate of Z Hz. Sunshine proved unable to deliver any frame rate higher than Z. Only while moving the cursor did Moonlight report a FPS of Y being delivered, but this was of little value to the user because the game kept being actually delivered at Z FPS (perhaps only the cursor was updating faster?). A test on the same machine with OBS being asked to capture Y FPS proved that OBS game capture was able to successfully record the game at an actual rate of Y FPS.
Expected Behavior
No response
Additional Context
No response
Host Operating System
Windows
Operating System Version
Architecture
32 bit
Sunshine commit or version
0.21.0
Package
Windows - installer
GPU Type
Nvidia
GPU Model
GPU Driver/Mesa Version
Capture Method (Linux Only)
No response
Config
-
Apps
No response
Relevant log output
-
Your cursor is drawn by GPU. The main frame is copied from (dwm?). OBS is probably using a different API, can it record UAC prompt?
OBS has a different method of capture, akin to Steam remote play, they can capture the DX/GL render target window instead of the whole framebuffer, this has several advantages like not being bound to the monitor refresh rate/aspect ratio and perfectly reproduce adaptive sync on the client using variable frame rate.
This could be a nice feature added to Sunshine but not an easy one to implement for sure.
Sunshine will capture the frame rate of the game, the refresh rate of the host does not matter at all. You most likely have vsync enabled, which causes the game to render at a lower frame rate. Or the game itself is rendering at a lower frame rate, due to the way how Sunshine captures the game there is no way for us to fix this.
Other products that captured at a constant frame rate had microstuttering problems due to uneven frames.
FWIW, once https://github.com/LizardByte/Sunshine/pull/2149 is completed there is an option for constant capturing rate which would "fix" this issue, but you'll notice microstuttering problems due to uneven frame pacing like i mentioned before, so I am skeptical this is even possible to resolve.
You most likely have vsync enabled, which causes the game to render at a lower frame rate.
Pls read what I stated carefully. The game is successfully rendering at a higher FPS than the monitor's refresh rate, but Sunshine fails to capture anything higher than the refresh rate. Unlike OBS.
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This issue was closed because it has been stalled for 10 days with no activity.