MultiChannel Video Output

Apr 11, 2006 at 6:45pm

MultiChannel Video Output

Does anyone know if it is possible to program some kind of vj-application which should allow us to export video independently to three projectors/beamers? Or is there already a program written in jitter/max which should allow us to do so?

I’ll give some more info on our project/problem:

we need to import video streams from three channels and combine this with video footage on disk. We then should be able to mix these different sources into three different and independent output channels. Is this possible?? And if so can anyone be so heroic/kind to point us in the right direction?

Thanks for your patience and endurance/help and ideas

#25369
Apr 11, 2006 at 7:39pm

There are video cards which output multiple outputs. For example http://www.matrox.com/mga/pid/products/qidpro.cfm

In max you could build a patch and set the outputs to the corresponding output/beamer as different jit.window’s.

But there is also resolume as vj software.
http://www.resolume.com/features/multiplescreens.php
If you have a video card with multiple outputs, resolume can send out different outputs while mixing.

ra.

#74627
Apr 11, 2006 at 8:51pm

well i’m running a G5 2.5GHz with 4.5RAM and 3 videocards in it on
agp i have ATI RADEON 9600 128Vram and 2 ATI RADEON 9200 128 Vram.
One for the patch screen and 2 big beamers. I have 2 player through
UYVY,slab texture and co. Video 25fps highquality enabled 720*568,
rolls cool. So different outputs depends on how many or wich video
card you have.
But going deeper in your question when i slab things how can i be
sure wich GPU on my computer works. Is the GPU choosen when i bring
my window on my videocard output or is it the gpu on my AGP slot wich
is doing the whole work?
Hiope we will get some answers?
Cheers
hubert

#74628
Apr 11, 2006 at 9:05pm

jit.gl.slab will work on the GPU which contains the named window.
Keep in mind a window which spans multiple cards may not work in HW
renderer.

-Joshua

#74629
Apr 11, 2006 at 9:35pm

I’ve build a similar vj tool for 3 screens

I use a G5 with 2 vid cards. 2 outputs each.

Search for my name and you will find some optimization discussion.
I usually use multi similar render context for all the screens. Seems
less efficient but cutting op in Regions Of Interest works on your CPU

Good luck,

#74630
Apr 13, 2006 at 11:50am

Thanks for the reply guys!

it helped us along quite a bit. By the way Maarten, would you have a problem with publishing your vj tool patch? just to get started… no hard feelings if you dont…

for the record, there’s another topic about multiple monitors going on further on the forum with quite some interesting issues:
http://www.cycling74.com/forums/index.php?t=msg&th=19182 &start=0&rid=0&S=4e331fe8a5b13047aadacbd494348d6 6

cheers!

#74631
Apr 13, 2006 at 12:01pm

#74632
Apr 15, 2006 at 10:27pm

Hi, it’s a little bit to complex too publish in an opensource way, If
you want some tips I’m always on the forum, just ask.

On 13/04/06, david wrote:
>
> Thanks for the reply guys!
>
> it helped us along quite a bit. By the way Maarten, would you have a problem with publishing your vj tool patch? just to get started… no hard feelings if you dont…
>
> for the record, there’s another topic about multiple monitors going on further on the forum with quite some interesting issues:
> http://www.cycling74.com/forums/index.php?t=msg&th=19182 &start=0&rid=0&S=4e331fe8a5b13047aadacbd494348d6 6
>
> cheers!
>

#74633
Apr 18, 2006 at 11:35am

Hi Maarten,

first of all, thanks for your support!
i’ll kick off with this issue:

how can i select the output port/channel for a jit.window/jit.pwindow?
apart from the dstrect attribute i don’t really find an attribute that let’s me tell the object which device and which output channel on that device it should use for output.

thanks in advance!

#74634

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