Nx Witness performs motion detection on the server side by analyzing and decoding the secondary stream from a camera, which is usually a low resolution stream while the primary stream is high-resolution.
Occasionally, a camera will report its configuration incorrectly and swap the primary and secondary streams. If this occurs and the secondary stream is high-resolution, motion detection processing will create a very high CPU load.
To correct this, it is possible to force motion detection on to a specific stream.
1.Open the Camera Settings -> Expert tab.
2.Check Force motion detection for stream and select Primary or Secondary.
3.Click Apply, OK or Cancel.
IMPORTANT: Adjusting these settings may seriously affect server performance!