System slowdown when using Zoom + OBS (virtual camera) on Multiple monitors

gi1242

New Member
Hi All,

I'm noticing a noticeable display lag (mouse cursor not smooth) when I create a virtual camera with OBS and use it on Zoom with two monitors.

Steps to reproduce:

  1. Open Zoom, start a video call (no lag)
  2. Open OBS, start a virtual camera and share a window/monitor (no lag)
  3. Switch the camera in Zoom to the OBS V4L2 loopback camera (mouse lag starts)

Alternately, start screen sharing in Zoom, and share content from second camera (mouse lag starts).

When just OBS is running the CPU consumption for a virtual camera is negligible (3.5%). I reduced my output size to 1920x1080, and frame rate to 10fps, and still have my mouse lagging when I do the above. (The system is pretty fast otherwise, and I see no noticable slowdown when I use other programs.)

I'm using a Lenovo X1 Yoga (4K display), external 4K monitor (Display Port), 16G ram, 11th Gen Intel® Core™ i5-1135G7 @ 2.40GHz × 8, Mesa Intel® Xe Graphics (TGL GT2). My log files are below.

Thanks in advance,

GI

 
Top