Rtp Settings; Network Options (Unicast/Multicast) - FLIR Nexus Configuration Manual

3 Advanced Configuration
The video streaming to a client program is done using a protocol generally referred to as Real-time
Transport Protocol (RTP), but there are actually many protocols involved, including Real-Time
Transport Control Protocol (RTCP) and Real Time Streaming Protocol (RTSP). In the background, a
"negotiation" takes place to establish a session between the client (such as FSM, or a third party VMS
or video player) and the camera. The ports which form a session are negotiated using a protocol such
as RTSP. A client typically requests a video stream using its preferred settings, and the camera can
respond with its preferred settings. As a result, many of the details are established dynamically, which
may run contrary to network security requirements.
3.8.1
According to the specification, RTP is originated
and received on even port numbers and the
associated RTCP communication uses the next
higher odd port number; the default RTP Port is
554. The Stream Name is used when
establishing a session from a client. The default
value recognized by FSM for the first stream is
ch0; the complete connection string is: 
rtsp://192.168.250.116/ch0.
If necessary, this stream name can be used to
open a video stream with a third-party video
player.
By default the video stream uses the IP address
of the camera. If the Use External IP parameter
is set to "yes", an alternate IP address can be entered.
Note, always use an even port number for the RTP Port parameter.
3.8.2
By default, the video streams from the camera are sent using unicast packets rather than multicast.
This means a given packet of IP Video will be sent separately to each client that has that video stream
open (for example, FSM clients, nDVR, and so on). Therefore each additional client will cause the
bandwidth consumption to go up and cause more overhead on the system in comparison to
multicast.
On the other hand, video packets sent using multicast are shared by streaming clients, so additional
clients do not cause bandwidth consumption to go up as dramatically. If the video streams are used
by more than one client/location, it may be wise to use multicast for more efficient bandwidth usage.
3-14

RTP Settings

Network Options (Unicast/Multicast)

427-0030-00-28 Version 110 Jun 2013