A Symphony video analytic engine may be running on your system. Tracking lines may appear as the camera follows an object through an area. These tracking lines vary in color according to object tracked and video engine used.
Colors
Red: Alarm object. An alarm overrides the default color.
Blue: Person object
Yellow: Vehicle object
Green: Unknown object
Specific Analytics
Motion Detection detects everything unknown (or alarm). Green or red.
Indoor People Tracking is always people (or alarm). Blue or red.
Outdoor People and Vehicle Tracking with no camera calibration is always unknown. Blue, yellow, green, or red.
PTZ Auto Tracking uses light purple for current moving object detection.