[vlc-devel] Re: Jumpy streaming multicast UDP: Any help appriciated...

Marius Kjeldahl marius at kjeldahl.net
Tue Feb 8 08:48:03 CET 2005

Dave Harley wrote:
> Hi there,
> I'm  streaming DVD using multicast UDP and its cloppy.  About ever 1/2
> second I loose a few frames.  The network is fine, the switch is a
> high end job and there is no packet loss, errors or collisions on
> either the rx or tx ports.  Below is a sample of the output from vlc
> with -vvv; can anyone shed any light on this or suggest anything to
> try?

I have the identical problem in my home office, and believe it to be the 
  fault of the swich I am currently using (definitively not "high end").

Why do I believe this? When I "unicast" the stream over UDP (simply 
sending the packets over UDP to just the one machine running the vlc 
client) from the same server as the original multicast came from, it 
runs just fine. Once I attempt to do the same using multicast, I loose a 
lot of frames (most, actually, but enough get through to indicate it is 
trying to listen to the stream).

I suggest you try the UDP unicast technique to absolutely rule out any 
network problems. If your network has the right stuff to carry the UDP 
unicast stream across, it should be able to carry a similar multicast 
just fine, assuming your switches and similar support it.

Marius Kjeldahl

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