If I understand correctly, the RTSP URL from the NVR is requested (such as used when streamed to VLC, etc.) so therefore a camera number will be required; if 4 cameras are being streamed from the NVR then you'd have 4 URL's all with the same IP (the NVR's LAN IP) and identical URL EXCEPT for the camera number:
Code:
rtsp:/<NVR-LAN-IP/axis-media/media.amp?camera=[CHANNEL]
IOW, like this:
Code:
rtsp:/192.168.1.66/axis-media/media.amp?camera=1
rtsp:/192.168.1.66/axis-media/media.amp?camera=2
rtsp:/192.168.1.66/axis-media/media.amp?camera=3
rtsp:/192.168.1.66/axis-media/media.amp?camera=4
And as noted, place 2 "/" after "RTSP:" as forum software won't allow 2 to be displayed consecutively.