User guide

Broadcasting
Encoder Presets
203
Wirecast User Guide | 154809
Multicast and Unicast
You can select Multicast or unicast from the Destination menu. Multicast lets you
broadcast to multiple computers simultainiously. Unicast lets you broadcast to a
specific computer.
You need to create an SDP File, and you must do so every time you change any option
on this page (including the encoder preset). To create an SDP file click the gear icon and
select Save SDP File, navigate to the desired location, and click Save in the Save File
dialog window. The SDP file must be given to the user to place on the computer that
receives your broadcast.
During multicast, your broadcasting computer sends data across your local network,
identifying it as a broadcast that it has no specific destination. Since many applications
could be doing the same thing, the broadcasting computer must have a unique way of
defining the data that is being multicast. This enables clients to choose between the
available multicast streams.
The multicast protocol uses unique addresses, one for video and one for audio.
Although these unique addresses look like TCP/IP addresses, they are not. Instead, they
provide a way to define uniqueness among all multicast data flowing over the network.
Once the broadcasting computer is streaming this data through the local network, any
computer on the network can receive it.
The SDP file becomes the glue between your broadcast computer and the viewer
computers. The SDP file contains multicast addresses, encoding format, and other
important information.
Select Multi
or Unicast
Select Save SDP
file