Hikvision: NVR RTSP URL Address

rtsp://<IP-address-of-device>:<RTSP-port>/Streaming/channels/<channel-number><stream-number>
rtsp://<username>:<password>@<IP-address-of-device>:<RTSP-port>/Streaming/channels/<channel-number><stream-number>

rtsp://173.200.91.70:10554/Streaming/channels/101 – get the main-stream of the 1st channel
rtsp://admin:password@173.200.91.70:10554/Streaming/channels/102 – get the sub-stream of the 1st channel