[AG-TECH] Bridging and Vic on a single machine multi-camera node

[Andrew Rowley]

Hi,

As you say, all the vic windows will try to bind to the same unicast
address.  However, one of them should succeed.  It is random as to which
this one is, but one of your vic windows should be receiving all the
incoming streams.  It may be that all the streams are "muted" however.  This
means that all the streams will be listed, but no preview will be shown (it
will be grey).  In this case, uncheck the "mute" button next to each of the
streams.  They will now be visible.

Andrew :)

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Email: Andrew.Rowley at manchester.ac.uk 
-----Original Message-----
From: owner-ag-tech at mcs.anl.gov [mailto:owner-ag-tech at mcs.anl.gov] On Behalf
Of Hill, NM (Nick)
Sent: 26 January 2005 21:49
To: 'ag-tech at mcs.anl.gov'
Subject: [AG-TECH] Bridging and Vic on a single machine multi-camera node

Hi all,

I have a question about bridging an AG session on a multi-camera single
machine node as it is not working properly for me. My understanding of this
is as follows but may be wrong:

When using multicast then you can have multiple Vics running and they all
pick up the multicast channels and all is fine. If you switch to a bridge
then multiple Vics uses unicast to transmit out to the bridge OK but all try
to bind to the same incoming ports so the vic for display doesn't receive
anything and just sits "Waiting for Video".

I cannot really see how this can work on a single machine node with multiple
cameras but I'm willing to be told I'm wrong and informed how to do it! It
doesn't do it by default. 

The only solution I have tried that works is to use two bridges. The first
bridge is used for the Vics providing camera output and the second bridge to
point a Vic at to get all the incoming streams. This rather defeats the
object of the neat Multicast/Unicast switch in the Venue server as you have
to manually run the vic to the second bridge to get the incoming streams :-(

This is of course irrelevant for either a multi-machine node or a PIG with
one camera.

Any help for a multi-camera single node machine greatly appreciated, 

Nick Hill
Rutherford Appleton Labs
e-Science Centre
n.m.hill at rl.ac.uk   
01235 445423 


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