Perfect! This is exactly the explanation I was looking for, and I am
confident it will work within the confines of my company's network. Thank
you VERY much.
--------------------------------------
Alan Abrams
Multimedia Specialist
Vertex Pharmaceuticals
email@hidden
Office: 617.444.6347
Cell Phone: 617.285.3706
George Cook
<email@hidden> To: email@hidden
cc: email@hidden
01/13/2003 12:53 Subject: RE:QTSS4 Multicast Relay Help---Please
AM
Alan:
There are a few ways to do this. Here's a brief overview to get you
started. You may also want to download and review the recently posted
QTSS admin guide from:
http://docs.info.apple.com/article.html?artnum=120175
First, on the local site, set up the "default relay" to automatically
relay to the remote sites. Select "Relay via TCP" and enter a valid
broadcast user name and password for each remote server. This will
automatically announce broadcasts from your local site to the remote
servers.
Second, on each remote server, set up a relay as follows. The Source
name or IP address should be the IP address or DNS name of your local
server. The mount point is the name of the sdp file that will be
generated. Check off "Wait for announced stream(s)" - in this case
because we are announcing the streams from your local server. Set the
destination to a valid multicast address (i.e. 239.1.1.1). Select
"Relay via UDP" and set the Base Port to a high number (I usually use
an even number in the 9000's such as 9016). Set "Multicast TTL" to the
number of routers you want the multicast to cross before it dies (for a
flat LAN environment, set it to 1).
The above are a one time process. Now, whenever you broadcast to your
local site (or start a Playlist) it will automatically be announced to
the remote sites, and relayed to the multicast address.
But there's one more thing...When you "tune in" to QTSS via RTSP you
will always get a unicast. For example, clients could tune in on the
broadcast by using rtsp://<local server ip>/<mount point>.sdp. But each
user will open a separate unicast.
To get a multicast from the server the client needs a multicast sdp
file. To create the multicast sdp, copy the sdp from either the
broadcaster, your local QTSS or the remote QTSS (you will find the sdp
in the movies directory). Edit the sdp to change each "c= IN IP4" line
to match the multicast address you specified above (i.e. c= IN IP4
239.1.1.1), Edit each "m=" line to the Base Port, incrementing each
"m=" line by 2 for each successive track (i.e. m=9016, m=9018, etc).
The multicast sdp file can be opened directly by QuickTime Player to
tune in on the multicast. You can e-mail the sdp file, or post it to a
web server. You cannot access the multicast sdp file directly from the
streaming server. I usually use a web server. Then from a QuickTime
client use "Open URL" with http://<address of web server>/<name of sdp
file>.
You will need to edit/create and post the multicast sdp file for each
broadcast.
-George
> Subject: QTSS4 Multicast Relay Help---Please
> To: email@hidden
> From: email@hidden
> Date: Sat, 11 Jan 2003 18:09:36 -0500
>
> Hello all.
>
> I want to understand the procedure for setting up a multicast relay
> using QTSS 4 for OSX Server. Basically, I'm broadcasting from QT
> Broadcaster, and
> I would like to relay the broadcast to 4 remote sites on my company's
> network that are set up for multicasting. Each of the remote sites has
> QTSS 4. I have a streaming server at my local site, and I would set up
> that server as the relay machine. I understand that I would have to
> relay to a multicast address, but I need to know the steps of the
> control
> panel. I keep reading that I have to manually modify the
> relayconfig.xml
> file, but can't I just set this up using the "default relay" control
> panel?
> If I do have to modify the XML file, how do people at the remote sites
> tune
> in to the multicast?
>
> Also, when making the reference movie, would I call the SDP file
> via RTSP?
>
> I've been a Multimedia developer for a while, but Streaming Server
> Administration is new to me. Any help would be GREATLY appreciated.
>
> --------------------------------------
> Alan Abrams
> Multimedia Specialist
> Vertex Pharmaceuticals
> email@hidden
> Office: 617.444.6347
> Cell Phone: 617.285.3706
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