Please use the following strings for Network Cameras/DVRs/NVRs
X2C X4C & X5C Cameras
Main Stream
rtsp://192.168.1.168:554/ch00/0
Sub Stream
rtsp://192.168.1.168:554/ch00/1
To Stream a Channel from the NVR/Recorder , XNxP / X2RxxxN / XHR1080DxxH (and IQR1080DxxH)
Main Stream
rtsp://192.168.1.100:554/ip01/0
Sub Stream
rtsp://192.168.1.100:554/ip01/1
To access the NVR/DVR channels use ip01 for channel 1, ip02 for channel 2, etc.
XC720/1080 IP Cameras
Main Stream
rtsp://192.168.1.188:554/ch01.264
Sub Stream
rtsp://192.168.1.188:554/ch01_sub.264
Also you can try
Main Stream
rtsp://192.168.1.188:554/ch01.264ptype
Sub Stream
rtsp://192.168.1.188:554/ch01_sub.264ptype
You can switch the IP camera from H.264 to MJPEG, then the RTSP link rtsp://192.168.1.188:554/h264/media.amp can give MJPEG RTSP stream.
X/XP720/1080 IP Cameras
Main Stream
rtsp://192.168.1.108:554/cam/realmonitor?channel=1&subtype=0&unicast=true
Sub Stream
rtsp://192.168.1.108:554/cam/realmonitor?channel=1&subtype=1&unicast=true