[AG-TECH] Re: Compiling VIC in Visual Studio 8 (2005)

[Piers O'Hanlon]

Hi,

On 01/02/07, Joseph Stone <stone004 at 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" <sgundry at vpac.org>
>
> To: <Andrew.Rowley at manchester.ac.uk>
>
> Cc: "Piers O'Hanlon" <p.ohanlon at cs.ucl.ac.uk>; <vic at cs.ucl.ac.uk>;
>
> "sumover-dev" <sumover-dev at cs.ucl.ac.uk>; <ag-tech at mcs.anl.gov>
>
> Sent: Tuesday, January 30, 2007 11:03 PM
>
> Subject: Re: [AG-TECH] Re: Compiling VIC in Visual Studio 8 (2005)
>