[streaming] VLC to DSS video problem

[Antonio Querubin]

I'm trying to get Darwin Streaming Server (DSS) to relay a transcoded 
multicast MPEG4 stream to unicast clients.  The MPEG4 stream and 
accompanying SDP file are produced by VLC from a Windows Media stream on a 
server running Windows Media Server.  If the MPEG 4 stream contains only 
audio, things work - a QuickTime client picks up the unicast audio stream 
relayed from DSS.

However, if the stream contains a video component, a QuickTime client 
connecting to DSS via unicast just hangs.  But the multicast MPEG4 stream 
from VLC is directly viewable by QuickTime.  So basically the multicast 
stream (from VLC) works but the unicast (relayed from DSS) does not when 
the stream contains video.

At first I thought this suggests the problem lies with DSS.  However, if I 
then generate a test video stream using QuickTime Broadcaster on a 
separate system instead of VLC, the unicast stream relayed from DSS works. 
So now I'm a bit confused as to where the problem actually lies.

Here's an abreviated version of the command line I use to do the 
transcoding:

"\program files\videolan\vlc\vlc.exe" mms://localhost/hskgf2006 
":sout=#transcode{vcodec=mp4v,vb=256,acodec=mp4a,ab=32}
:duplicate{dst=rtp{dst=233.25.35.220,ttl=255,sdp=sap,
sdp=file://c:\program files\darwin streaming server\movies\hskgf2006.sdp,
name=hskgf2006}"

Note that Windows Media Server, VLC, and DSS are all running concurrently 
on the same Windows 2003 Enterprise Server.

When I searched the archives the only thing I found that might be 
pertinent is that perhaps RTP packets generated by VLC may be too large 
for DSS if they contain video.  If that's true then how does one reduce 
the size of RTP packets that VLC generates?

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