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Chapter 3 Managing Your QuickTime Streaming Server 39

Configuring a Multicast Relay

Setting up a multicast relay allows you to receive a unicast stream from one server and

relay it out to a local area network over multicast (note that network must be multicast

enabled for viewers to be able to access the stream). The following steps show how this

is set up.

To relay an incoming stream as a multicast stream:

1 Set up a multicast relay on the streaming server.

a If the broadcast source for the relay is configured as an Automatic Unicast

(Announce), set the Relay Type to “Announced UDP.” If the broadcast source for the

relay is configured as a Manual Unicast, set the Relay Type to “Request Incoming

Stream.”

b Set the “Source IP” of the relay to 127.0.0.1.

c Set the path to the Announced (specified in step 2) or Unannounced sdp file

(manually copied to the server) as the “Path” for the relay. This path is relative to your

streaming server's Movies directory. Make sure to include the “.sdp” extension.

d If you are using Automatic Unicast on the Broadcaster/Encoder, select “Announced

UDP” for the Relay Type. If the source is a manual unicast, select “Request Incoming

Stream.”

e Leave User Name and Password fields blank. When using the loopback address

(127.0.0.1), authentication is not required.

f Create a destination for the relay by clicking the “+” icon. Specify a valid multicast

address for the Destination IP address. Set the Destination type to “Unannounced

UDP.” Set the UDP base port number to an even number (something in the 9000–

9996 range works well). The multicast TTL is the number of router hops the multicast

will work through. Set it for the topology of the network you are working on.

g Click the Save button.

2 Set up QuickTime Broadcaster to send an “Automatic Unicast (Announce)” or “Manual

Unicast” to the server.

For Automatic Unicasts, the filename specified in Broadcaster will be created on the

server (the .sdp extension will be added if not specified). More information on

Automatic Unicast is available on page 35. For Manual Unicast, the .sdp file must be

Exported from Broadcaster and manually copied to the Streaming Server's Movies

directory. After you start the broadcast, test the reflected stream from the server in

QuickTime Player by opening this URL:

rtsp://<serverIP>/<filename.sdp>

3 To enable clients to tune in to the multicast relay, make a copy of the SDP file and edit

the copy as follows:

a In the line that begins with c=IN IP4, change the IP address to the multicast IP

address specified in step 1.

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Apple QuickTime Technical Information Seite 39