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

[bdr]

I think this is motivation to enhance the AG streams to use SSM - then 
you could select which source multicast streams you want to receive, 
which would permit those on low bandwidth connections to choose how to 
spend their bandwidth.

George Estes wrote:
>   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 <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)
>>>       
>
>
>
>
>   

-- 
Bob Riddle (bdr @ umich.edu)            Enabling Technologies
University of Michigan Medical School   1301 Catherine Street
M4101 MSB1 - 6024                       Ann Arbor, Michigan  48109-0624

"Math illiteracy affects 7 out of every 5 people"

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