Question / Help Rendering Lag / Please help

V

Voocamced

New Member
Dear community,
I've been using obs to record and stream conferences using USB cams and hdmi capture cards for the last 3 years without real problems. Always been using i5 or i7 laptops and desktop machines laying around without even thinking about as long as encoding lags were fine. I only mix video sources, no games at all.

3 weeks ago a purchased 3 used Dell T5600 Workstations with 2x E2660 6core Xeons running at 2ghz, 16gb ram and Nvidia Quadro 4000 gfx, running Windows 7 bravely for almost no money (I thought) to be able to track problems based on 1 system.

Running OBS 24.0.1 in 1080p25, I have no problem with x264 encoding at medium settings for recording (around 30% cpu with no dropped frames) but I discovered massive dropped frames due to rendering lag (even when not recording).
Almost every action done opening windows in obs or windows 7 seems to break the render pipe in obs giving 4 to 20 dropped frames.

Gpu ist doing nothing at 5 to 15% depending on scene complexity, cpu is sleeping at 2 to 3%...

Any idea would be a tresor!

PS: I've been trying a gt1030 as well giving me exactly the same behavior. That same Gpu runs like a charm in another i5 desktop but running windows 10.

Sorry no log files on hand right now. Back in the office on Monday
 
carlmmii

carlmmii

Active Member
Is it possible to disable one of the CPUs? Not exactly sure how the PCIe/CPU connect works with dual socket boards of that era, wondering if there's possibly something there that is tripping things up.
 
Narcogen

Narcogen

Active Member
Tried older versions of OBS? At some point Win7 compatibility is probably just going to break, I would expect.
 
V

Voocamced

New Member
Thx for replies!
The workstations were delivered with only one cpu, and I just got some more to upgrade them to dual cpu. The single cpu units do react the same.
My goal was to use NDI Cams from Panasonic and keep everything NDI, so I am not sure if older versions of OBS will handle it. I don't want to invest 500 € on a multi input capture card to have SDI inputs and then find out I still have the problem.
My next move will be to clean install win10 on one system. Hopefully drivers for the Nvidia Quadro are then able to handle rendering.
It seems that nvenc is not available on win7. I thought the quadro would not give me nvenc so I switched to a gt730 (which gives me nvenc and new nvenc on my i5 system) but still no nvenc.

I'll keep you updated on improvements
 
carlmmii

carlmmii

Active Member
That seems odd that nvenc wouldn't be picked up. OBS on windows 7 should still be able to use the standard nvenc encoder -- only the (new) version is disabled because of missing DX features.

Considering the lack of nvenc, and the apparent slowness, I would definitely be looking down the path of NVidia drivers for the platform.
 
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