Being able to select which video streams to receive would definitely be helpful in our project to deploy PIGs to K-12 schools. Many of these schools are bandwidth challenged. We have been looking at ways to minimize bandwidth usage where needed and this would be excellent.
George At 06:23 PM 2/1/2007 -0600, Piers O'Hanlon wrote: >Hi, > >On 01/02/07, Joseph Stone <[email protected]> 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" <[email protected]> >> >>To: <[email protected]> >> >>Cc: "Piers O'Hanlon" <[email protected]>; <[email protected]>; >> >>"sumover-dev" <[email protected]>; <[email protected]> >> >>Sent: Tuesday, January 30, 2007 11:03 PM >> >>Subject: Re: [AG-TECH] Re: Compiling VIC in Visual Studio 8 (2005)
