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Index › Programming Questions & Help › Video Capture,  Movie Playback,  Vision Libraries › 2 different video outputs from 1 sketch
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2 different video outputs from 1 sketch (Read 770 times)
cerbellum
2 different video outputs from 1 sketch
Aug 23rd, 2007, 2:22pm  
Ok, here I go, I'm currently working on a project which should do the following:

• capture video from external source set it as bg
• have a drawing tool over that video
• broadcast 2 different outputs, 1. where you can see the video + real-time drawing, 2. where you can only see the real-time drawing on a blue bg used for bluekeying.

I'm fine with the first 2 (although I'd like to get that drawing smoother, is there anything like smooth() for P3D?). The real tricky part is the 2 different sources I need to broadcast. I actually have no clue what-so-ever on how to get this thing going, so every push in the right direction is sincerely appreciated.

I'm still quite a newbie, but trying to get the hang of it all.

Thanks.
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extrapixel
Re: 2 different video outputs from 1 sketch
Reply #1 - Aug 25th, 2007, 5:14pm  
Hi,

if you have a dual-out graphics card, you could extend your desktop to the second monitor. Then make your sketch the size of both screens like so for example:

screen1 : 1024 * 768 (video + real-time drawing)
screen2 : 1600 * 1200 (real-time drawing on a blue bg)

= sketch size : 2624 * 1200
-> sketch size is the union rect of the two screens when placed next to each other. You have to change the values to the resolutions you're using.

In the example above, things drawn with x>1024 appear on the second screen (your output 2).

Your device which does the bluekeying could capture the output from screen2. Not sure what you're using there though.

patrick
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cerbellum
Re: 2 different video outputs from 1 sketch
Reply #2 - Aug 26th, 2007, 4:13pm  
sounds totally logic Smiley I'll give it a shot. Thanks!
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cerbellum
Re: 2 different video outputs from 1 sketch
Reply #3 - Aug 29th, 2007, 9:59am  
Ok, been trying this out which works nicely, though I'm still having some problems.

1. The drawing on the video looks crappy as smoothing doesn't work in P3D.
2. The larger I make the canvas the slower the drawing part gets (due to the scaling video capture), ok, understandable, any way to speed this up?

Thanks.
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