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VIVOTEK
User's Manual - 103
Unicast video transmission delivers a stream through point-to-point transmission; multicast, on the other
hand, sends a stream to the multicast group address and allows multiple clients to acquire the stream at
the same time by requesting a copy from the multicast group address. Therefore, enabling multicast can
eectively save Internet bandwith.
The ports can be changed to values between 1025 and 65535. The multicast RTP port must be an even
number and the multicast RTCP port number is the multicast RTP port number plus one, and thus is
always odd. When the multicast RTP port changes, the multicast RTCP port will change accordingly.
If the multicast RTP video ports are incorrectly assigned, the following warning message will be
displayed:
Multicast TTL [1~255]: The multicast TTL (Time To Live) is the value that tells the router the range a
packet can be forwarded. Each hop decreases TTL by one.
Initial TTL Scope
0 Restricted to the same host
1 Restricted to the same subnetwork
15 Restricted to the same site
64 Restricted to the same region
128 Restricted to the same continent
255 Unrestricted in scope
IMPORTANT:
The Multicast metadata port is utilized by VIVOTEK VADP modules to transfer video analytics results,
PTZ stream, textual data, and event messages between the camera and the client side running and
observing the video analysis. If your client side computer is located outside the local network, you may
need to open the associated TCP port on routers and rewall.
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