Question / Help OBS causing a system Kernal usage to bring CPU from 8% to 100%my laptop idles at 8%, when I open OBS

Mednar

New Member
For further info, the screen does not move with the pointer, it's always the top left quadrant regardless of where my mouse is. I am using the VB audio and seem to be able to get it to work when I can get the video to work. I think solving the video issue will solve all issues.
 

sam686

Member
Logs shows 1280x720.. You can try to get audio to work like "Listen to this device" in gaming computer.
You can try custom resolution in video capture settings, pick 1920x1080, but I find this device only list one resolution, that appears to only change when it is receiving both audio and video together. Some consoles like PS4 always send audio together with video, even if the audio is blank like output to headphones "All audio".
 

sam686

Member
Try to unplug and plug in the HDMI capture device, then check again.

On sound properties, windows recording devices, it may show "Microphone USB audio device", make sure it isn't set as primary, change primary microphone if it is. Then close out of sound properties (or at least switch away from recording tab).
 

Mednar

New Member
I don't think the sound is an issue any longer as I can get that to work whenever I can get the video to work. I've of course tried re-plugging the capture device many times, and also tried rebooting with it connected, and rebooting it and connecting it after loading obs. No difference across the board.
 

sam686

Member
You can try to plug it into video game console like xbox one or PS4, stop and start capture device, then plug it back into gaming computer, all while capture device stays connected to streaming computer. Edit: HDMI switch or HDMI matrix may make this process faster.
 

Mednar

New Member
So I now have both the sizing and audio issues fixed. New problem is video stutters in OBS periodically, even though the pc resources are below 50% across the board, and there is no stuttering on the PC the feed is coming through. Especially noticeable in Blizzard games but seen in others as well. Attached are the logs since my last post.
 

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Mednar

New Member
Will this cause a delay? Will the delay be subject to growing throughout the stream over hours? Thinking about video and audio syncing from cap card, mic, and webcam.
 

sam686

Member
Try it, buffering might cause up to 0.2 second video delay, still far less then over 1 second delay of elgato HD usb 2.0.

... Kindof spending my time actually playing PS4 games with this capture device. sam6861 on twitch.
 

RSSCommentary

New Member
I'm also having a HUGE problem with the System thread maxing out my Ryzen 9 5900x system. I have two Elgato CamLink Pro quad PCIe x4 HDMI capture cards going with only one HDMI source displayed at a time. Clearly Elgato is a common factor here, and it probably has something to do with how you can allow multiple sources to use the same camera at the same time, which is a horrible design that no one wants. For me I can deactivate and reactivate the sources and the System thread CPU usage goes down to 25% so this appears to be the easy fix, but you need to write Elgato to request they remove said driver feature causing the bug.
 

RSSCommentary

New Member
Sorry, typo, can't edit my post: my System thread CPU usage is about 2%, 45% total with Firefox playing video, right now with one 4K30 NV12 source with CamLink Pro. For all of my scenes I have a Group that contains all of my cameras and audio sources muted/not visible. When my system feels sluggish, I just deactivate and reactive the current camera that is soloed. I've never had any luck fixing this issue by resetting my computer.
 
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