Nx Witness User Manual

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. 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, you can force motion detection onto 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 or OK when finished. To discard changes, click Cancel.

IMPORTANT: Adjusting these settings can seriously affect server performance! See "Dual Stream Processing" for details.