User guide

82 Chapter 8
Stream Switcher
Version 3.1
Viewing the active source
To view the output of the switcher:
• If the broadcasters broadcast the SDP to port 9875, the switcher will
automatically transfer the SDP to port 9875 of the output address. See
“Installing the Envivio Linux Kernel” on page 32 for further details on
using this feature.
• If the broadcasters broadcast the SDP using SAP, the switcher will not
be able to send the SDP to the output address. In this case you need to
modify the SDP file (see next paragraph), and open it from your
player.
• Otherwise, modify the SDP file created by one of the sources (see next
paragraph), and open it from your player.
Modifying an SDP file
To create an SDP file that the player can use to view the active source:
1. Retrieve the SDP file created by one of the sources, for example, the
first Envivio 4Caster.
2. Change the IP address (
c=) and port (m=) to those defined in the
output settings. In our example, change:
c=IN IP4 236.130.82.35/1 to c=IN IP4 235.55.58.54 for the IP address
m=video 6850 RTP/AVP 96 to m=video 6002 RTP/AVP 96, and
m=audio 6852 RTP/AVP 97 to m=audio 6004 RTP/AVP 97 for the port
numbers and so on for each m= line.