[AG-TECH] Video capture to video mixer.

[Allan Spale]

Jimmy,

I have done some video mixing in the past.  You could do this in theory,
but it would probably involve a chroma key effect.  For instance, you
could have a pure blue or greeen Windows desktop (assuming this card is
sending the entire video signal out through S-Video or composite to the
video mixer).  The desktop could contain video arranged of other sites or
other graphics related to the display machine.  Then, you would replace
the chroma key with some live video stream from a local camera.

This is actually how I have done a crawl like on MSNBC or CNN.  I would
create a MS Powerpoint file that had a solid color background (like blue) 
and put some sort of graphics title like (Electronic Visualization
Laboratory/University of Illinois at Chicago).  Then I downloaded a ticker
from CoolTick (http://www.cooltick.com).  I would run the slide show and
start the ticker program.  Once this was running, I would select my chroma
key color (the background color of the slide) and select the input of the
local video coming into the video mixer).  As a result, I could see a
video signal from the room composited with a graphics title and a ticker.
In your case, you would be using vic video screens arranged on some solid
color background.  Then you could chroma key your local video before it
goes to the video card.

As a joke test, you could have the angel video/devil video scenario.  You
could have live local video of you sitting in a chair pondering the
situation.  On your left shoulder, you could have some "evil person"  in
the video stream telling you what you should do.  On your right shoulder,
you could have some "good person" in the video stream.  Assuming the audio
was coming from RAT and not being dealt with by the mixer, this might be a
fun way to come up with a scenario for testing having vic windows
"floating" around your live local video.  Then you send that chroma keyed
video to the AG.

Good luck.


Allan
EVL at UIC
node-op

On Mon, 12 May 2003, Jimmy Miklavcic wrote:

> Actually, I want to mix video from remote sites together or with local 
> video and send it back out.
> 
> Jimmy
> 
> Deb Agarwal wrote:
> 
> > We have used the Panasonic video mixers to switch between incoming
> > camera feeds and do picture-in-picture.  Is this what you are referring
> > to?
> >
> > Deb
> >
> > Jimmy Miklavcic wrote:
> >
> >> Is anyone out there able to take the incoming video feeds and process 
> >> them through a video mixer?
> >> I know some of the graphics cards have an svideo output, does that 
> >> take the entire screen as the output signal?
> >>
> >> Jimmy
> >>
> >
> >
> 
> -- 
> Jimmy Miklavcic
> Multimedia Specialist
> jhm at chpc.utah.edu
> 
> UNIVERSITY OF UTAH
> CTR FOR HIGH PERFORM COMPUTING
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> 
> Office: 801.585.9335
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> 
> http://www.chpc.utah.edu/~jhm
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> 
> 
>