Hi, On 01/02/07, Joseph Stone <stone...@umn.edu> wrote: > We've identified a need to have slow downlink participants be able to send > their video but not receive video. The idea here being that high downlink > bandwidth participants will be able to see everyone who is participating. > It's not enough to just not display the video for slow downers, the bridge > needs to be told not to even send the stream at all. It's enough for them > to be seen and for them to have two way audio (highly compressed - i.e. > GSM). > > > Is there a current version of vic that will fill the need?
There are a few approaches that we may be able to take: 1) Modify VIC so that it does not join the multicast group - thus it should only send traffic into the network and not receive any video traffic from external sources. I'm not sure if this will work (though it should in theory - We can test it..) but we could add this feature fairly easily. 2) The following two options depend on having wide deployment of a newer version of Internet Group Management Protocol (IGMP) - Version 3. Unfortunately I don't believe it is - though it is seeing wider deployment. 2a) UCL vic has recently included a new feature that allows one to use Single Source Multicast (SSM) - Which needs to be started using a slightly different command line. For video reception a separate vic will need to started for each video stream wished to be received. 2a) VIC could be enhanced to actually take advantage of some new features - namely source based filtering. which would allow one to choose which video srcs one wanted to see. 3) Another approach would be to use a special gateway or relay that allows on to filter/choose the sources recieved - there are a few that have featured in various AG retreats. I'd would like to hear if others are interested in such functionality. Piers. > > Joe > > > On Jan 31, 2007, at 4:25 PM, Sam Gundry wrote: > > > Hi Socrates, > > > > > I actually commented out this line yesterday, before receiving this email. > :) > > > > > Video images now display locally in both the consumer and producer windows. > > > > > What should that line of code do? I haven't noticed anything out of the > ordinary yet... > > > > > Thanks, > > Sam > > > > > > > > > > > Socrates Varakliotis wrote: > > > Hi Sam, > > I assume you're still building Vic on Windows. > > Can you comment out line 562 in tcl/ui-main.tcl and rebuild? > > #$target enable_xv $enable_xv" > > Let me know what happens then. > > Thanks, > > -- > > Socrates. > > ----- Original Message ----- From: "Sam Gundry" <sgun...@vpac.org> > > To: <andrew.row...@manchester.ac.uk> > > Cc: "Piers O'Hanlon" <p.ohan...@cs.ucl.ac.uk>; <v...@cs.ucl.ac.uk>; > > "sumover-dev" <sumover-...@cs.ucl.ac.uk>; <ag-t...@mcs.anl.gov> > > Sent: Tuesday, January 30, 2007 11:03 PM > > Subject: Re: [AG-TECH] Re: Compiling VIC in Visual Studio 8 (2005) >