g4 and multiple video out

Nov 21, 2006 at 12:43pm

g4 and multiple video out

hi list,
i was wondering if anybody could give me a hint:
i need to be able to route 3 different video streams to 3 different
monitors (or projectors)
using my own powermac g4. i’ve seen it is possible to place different
graphic cards onto a g5 but i’ve not found anything about g4s…and i
don’t wish to buy a card and discover it is useless…
any help much appreciated
cheers
luca

#28806
Nov 21, 2006 at 2:05pm

#88773
Nov 21, 2006 at 2:09pm

Quote: patrick.suchet wrote on Tue, 21 November 2006 15:05
—————————————————-
> You can try this
> http://www.matrox.com/graphics/en/gxm/products/
> An external card for multi display support. See compatibility’s list.

Yeah. We just bought the triplehead2go two weeks ago. It works perfect on mac os x (although the dealer says it doesn’t).

#88774
Nov 21, 2006 at 2:41pm

thanks.
i’ll go and check!
lu

2006/11/21, Mattijs Kneppers :
>
> Quote: patrick.suchet wrote on Tue, 21 November 2006 15:05
> —————————————————-
> > You can try this
> > http://www.matrox.com/graphics/en/gxm/products/
> > An external card for multi display support. See compatibility’s list.
>
> Yeah. We just bought the triplehead2go two weeks ago. It works perfect on mac os x (although the dealer says it doesn’t).
> –
> SmadSteck – http://www.smadsteck.nl
> Interactive audiovisual sampling soft- and hardware
>
>

#88775
Nov 21, 2006 at 3:21pm

how does it split it do you have 3 screens plus your monitor for
previewing or would it be my laptop plus 2.

Cheers

Jack
On 21 Nov 2006, at 14:41, zero para wrote:

> thanks.
> i’ll go and check!
> lu
>
> 2006/11/21, Mattijs Kneppers :
>>
>> Quote: patrick.suchet wrote on Tue, 21 November 2006 15:05
>> —————————————————-
>> > You can try this
>> > http://www.matrox.com/graphics/en/gxm/products/
>> > An external card for multi display support. See compatibility’s
>> list.
>>
>> Yeah. We just bought the triplehead2go two weeks ago. It works
>> perfect on mac os x (although the dealer says it doesn’t).
>> –
>> SmadSteck – http://www.smadsteck.nl
>> Interactive audiovisual sampling soft- and hardware
>>
>>
> —
> Virus scanned by Lumison.

Jack Keenan
360tv Coordinator
Peacock Visual Arts
21 Castle Street
Aberdeen
AB11 5BQ

Tel: 01224 639539
Fax: 01224 627094

http://www.360tv.org.uk
http://www.superchannel.org
http://www.peacockvisualarts.com

#88776
Nov 21, 2006 at 3:42pm

at present i do not need previewing as i’m setting up a museum installation…
3 monitors, 6 speakers, a bunch of sensors.
thanks for replying
lu

2006/11/21, jack keenan :
> how does it split it do you have 3 screens plus your monitor for previewing
> or would it be my laptop plus 2.
>
> Cheers
>
> Jack
>
> On 21 Nov 2006, at 14:41, zero para wrote:
>
> thanks.
> i’ll go and check!
> lu
>
> 2006/11/21, Mattijs Kneppers :
>
> Quote: patrick.suchet wrote on Tue, 21 November 2006 15:05
> —————————————————-
> > You can try this
> > http://www.matrox.com/graphics/en/gxm/products/
> > An external card for multi display support. See compatibility’s list.
>
> Yeah. We just bought the triplehead2go two weeks ago. It works perfect on
> mac os x (although the dealer says it doesn’t).
> –
> SmadSteck – http://www.smadsteck.nl
> Interactive audiovisual sampling soft- and hardware
>
>
>
> –
> Virus scanned by Lumison.
>
> Jack Keenan
> 360tv Coordinator
> Peacock Visual Arts
> 21 Castle Street
> Aberdeen
> AB11 5BQ
>
> Tel: 01224 639539
> Fax: 01224 627094
>
> http://www.360tv.org.uk
> http://www.superchannel.org
> http://www.peacockvisualarts.com
>
>
>
>
>
>
>
>

#88777
Nov 21, 2006 at 4:04pm

how does it split it do you have 3 screens plus your monitor for previewing
> or would it be my laptop plus 2.
>

Actually, the triplehead2go appears to your computer as an external screen
with proportions 12:3. so your computer thinks you have one external screen,
while it are in fact three different displays. The triplehead2go has one
input + three outputs and does this splitting for you, offering you one big
space to go nuts.

I’ve been using this and am pretty satisfied. You should note however that
all your video processing will have to happen by one GPU!! (the one
connected to the triplehead’s input…)
So this puts quite some weight on your existing graphics card…

#88778
Nov 21, 2006 at 4:40pm

Quote: mojo wrote on Tue, 21 November 2006 17:04
—————————————————-
> how does it split it do you have 3 screens plus your monitor for previewing
> > or would it be my laptop plus 2.
> >
>
>
> Actually, the triplehead2go appears to your computer as an external screen
> with proportions 12:3. so your computer thinks you have one external screen,
> while it are in fact three different displays. The triplehead2go has one
> input + three outputs and does this splitting for you, offering you one big
> space to go nuts.
>
> I’ve been using this and am pretty satisfied. You should note however that
> all your video processing will have to happen by one GPU!! (the one
> connected to the triplehead’s input…)
> So this puts quite some weight on your existing graphics card…

The weight is fine. Working with jitter never really ends up in the gpu being the bottleneck. The limitation of sending matrixes back and forth on a maximum of 1 cpu is currently the real performance issue.

When you have multiple video outs on your computer (4 in my case), you can use three as preview/control monitors and the 4th one as an output of up to 3840 x 1024, split into 3 vga signals.

I really like it. Now we can just say ‘we need 3 beamers with vga inputs’ instead of ‘we need 3 beamers, a video splitter and 3 scan converters with vga input that have a zoom ratio of at least 3x’.

- Mattijs

#88779
Nov 21, 2006 at 5:05pm

thank you all for sharing your knowledge…
still i have to be sure this solution will work on my machine!
(a G4 double processor 867mhz running on os x.3.9)
cheers
lu

#88780
Nov 21, 2006 at 5:35pm

in case you need another solution:
two graphics cards in one G4 is very well possible.
one card sits in the AGP slot, the other in the PCI slot.
the AGP slot is 4x or 8x faster than the PCI slot, so it is best to
allocate the GPU process with most data traffic to the AGP card.

I have used this in various G4 machines (QS/733MHz, windtunnel/1.42GHz).
I used the PCI card as the “control center”, with the UI and the
menubar etc.
while the two monitors connected to the AGP card were linked to the
beamers,
both running in full screen mode.

This set up was very easy to configure, just plug in the cards and
install the drivers,
then drag the menu bar over to the PCI screen (in the displays
control panel). done.

HtH
-jennek

On 21-nov-2006, at 18:05, zero para wrote:

> thank you all for sharing your knowledge…
> still i have to be sure this solution will work on my machine!
> (a G4 double processor 867mhz running on os x.3.9)
> cheers
> lu
>

#88781
Nov 22, 2006 at 3:38am

If the computer sees the 3 monitors as one wide screen, I am guessing you can’t go fullscreen mode in each monitor. How would you go fullscreen with 3 jit.windows, for example?

Greg

#88782
Nov 22, 2006 at 9:29am

Quote: qfwfqduo wrote on Wed, 22 November 2006 04:38
—————————————————-
> If the computer sees the 3 monitors as one wide screen, I am guessing you can’t go fullscreen mode in each monitor. How would you go fullscreen with 3 jit.windows, for example?

That’s right. You can only go fullscreen at all three monitors at the same time. Because we use the monitors as a combined output screen that is no problem. To position movies within that space, we project the movies on videoplanes.

#88783
Nov 22, 2006 at 3:01pm

FWIW I just connected the triplehead2go to the computer with a dvi-to-vga converter and a vga-to-vga cable; that didn’t work. Mac OS didn’t autodetect the correct dimensions. When I connect it with the short dvi-to-vga cable that came from matrox, everything is fine.

- Mattijs

#88784
Nov 22, 2006 at 8:47pm

Anyone ever tried the Triplehead2go on a Powerbook G4? Would it work?

G.

#88785
Nov 23, 2006 at 10:21am

Quote: qfwfqduo wrote on Wed, 22 November 2006 21:47
—————————————————-
> Anyone ever tried the Triplehead2go on a Powerbook G4? Would it work?
>
> G.
—————————————————-

I just tried for you. Yes, it works.
Mattijs

#88786
Nov 23, 2006 at 1:23pm

thanks to everybody, you’ve been most helpful
lu

2006/11/23, Mattijs Kneppers :
>
> Quote: qfwfqduo wrote on Wed, 22 November 2006 21:47
> —————————————————-
> > Anyone ever tried the Triplehead2go on a Powerbook G4? Would it work?
> >
> > G.
> —————————————————-
>
> I just tried for you. Yes, it works.
> Mattijs
> –
> SmadSteck – http://www.smadsteck.nl
> Interactive audiovisual sampling soft- and hardware
>
>

#88787

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