Question / Help Gaming PC's NDI out FPS drops significantly when in game.

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BludyDucky

New Member
Hello, So my OBS/NDI setup works flawlessly, when I'm not tabbed into the game. The second I tab into game its like my computer forgets that OBS is a thing and FPS on the gaming pc drops to like 10-20 fps. the second I tab out of the game boom, FPS instantly goes back up to 59.94 fps.

I've done full clean install of OBS on both the gaming and streaming PC's. Rebuilt my home network. Everything is hardwired with gigabit ethernet.

I have a 9700K running very stable @ 5.1GHz on all cores, a Asus Strix 1080 Ti running a very mild overclock. Asus Hero XI, OBS is installed on my boot drive 970 EVO 1TB. I have 32GB DDR4 3000mhz RAM (8x4) Windows 10 is my OS (latest update)

I do see a few errors on the log. I thought a fresh install would have fixed them but they are the same errors I had before. Not sure if they actually matter or not.

I've googled this issue like almost everyday for the past 2 months. I know many people have this issue, and no one seems to know how to fix it.

Thank-you for your time and expertise
 

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Narcogen

Narcogen

Active Member
Is Game Mode on?

19:42:34.454: Output 'NDI Main Output': Number of lagged frames due to rendering lag/stalls: 451206 (25.0%)

When OBS is trying to render scenes for the NDI output, it can't 25% of the time because the GPU is too busy.

Game Mode being on could cause this. If it's happening without game mode being on, you need to limit the game's GPU utilization to give OBS resources to operate, either by reducing quality settings, capping framerate, turning on vsync. Nothing to do with network.
 
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BludyDucky

New Member
Thank-you Narcogen. I was unaware of this game mode setting. I did turn if off, I will report back to see if it helped laster after my stream. Thanks again :)
 
Narcogen

Narcogen

Active Member
PC Settings > Game Mode in Windows 10.

You don't want to turn it on, you want to turn it off, if you're streaming or recording. Turning it all devotes GPU resources only to the game, which reduces OBS' performance.
 
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BludyDucky

New Member
Hello again, I ran my stream yesterday and it was flawless for hours. Turning off the windows game mode was the answer I’ve been looking everywhere for. I cannot thank-you enough Narcogen. You've helped me so much :)
 
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