Anyone had any experience creating a playlist in QTSS and
multicasting it using the built-in Relay?
The multicast relay works fine when I unicast from another computer
using QT Broadcaster , but I had some questions on multicasting
playlists.
First of all, are we supposed to use the bottom form in the QTSS web-
based admin playlist editor, "Send this playlist to a broadcast
server", when the same computer is both creating the playlist and
reflecting it? And, if so, are we supposed to put in the network
address of the computer (136.244.96.107) or the multicast address
(233.88.214.140), in the "IP Address"?
Second, I am trying to verify the changes I have to make in the sdp
file for clients to receive the multicast.
For example (this is simplified), in the sdp file created by QT
Broadcaster, and put on QTSS, we have:
o= IN IP4 127.0.0.0
m= audio 5432 RTP/AVP 96
c= IN IP4 136.244.96.107
m= video 5434 RTP/AVP 96
c= IN IP4 136.244.96.107
This is changed to the following sdp for distribution to multicast
clients
o= IN IP4 127.0.0.0
m= audio 9000 RTP/AVP 96
c= IN IP4 233.88.214.140
m= video 9002 RTP/AVP 96
c= IN IP4 233.88.214.140
Here is the summary of the sdp file created by the playlist, which
is a bit different:
o= IN IP4 136.244.96.107
c= IN IP4 127.0.0.1
m= audio 0 RTP/AVP 96
m= video 0 RTP/AVP 96
would I change this, for multicast clients, to:
o= IN IP4 127.0.0.0
c= IN IP4 233.88.214.140
m= audio 9000 RTP/AVP 96
m= video 9002 RTP/AVP 96
I believe I figured out all the settings in the QTSS Relay windows,
but am a bit confused on playlists, and only have a few hours Monday
to test this with the network admins, who want to be there for any
multicast changes. Trying to get my ducks in a row...Right now the
playlist seems to be working fine from
rtsp://136.244.12.63/play2.sdp
The b-frames sometimes don't work on VLC (jerky playback), so I am
re-encoding without them, using 1 mbps H.264.
We also have the usual occasional unpredictable client problems on
VLC on OSX when using rtsp, but the QT Broadcaster multicast works
well.
We will make the playlist and multicast from
136.244.96.107/233.88.214.140
Thanks,
Frank Fulchiero
Digital Media Specialist
Connecticut College
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