DW Spectrum 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.Apply changes.
IMPORTANT: Adjusting these settings can seriously affect server performance. See "Dual Stream Processing" for details.