摄像头的区别 USB vs RTSP vs ONVIF If we use USB cameras we do not need the camera url and some functions like moving, zooming etc. will not be available. In the case of RTSP cameras and ONVIF cameras there are more functions available. The difference between the RTSP camera and the ONVIF camera is the following: the RTSP camera has only one stream in comparsion with the ONVIF camera having multiple streams at a time