Forums > MaxMSP

2 cameras in jitter

January 11, 2007 | 6:41 am

Hello,

do any of you think it is possible to have to TWO live cameras connected into a

PowerPC G4
1.67 GHz
512 MB DDR SDRAM
L2 Cache 512 KB
Bus Speed: 167 Mhz
OSX 10.4.8

for live video tracking (mainly find bounds)?
if so, is 30 fps per camera reasonable?

thanks,

J

On 1/10/07, karl-otto von oertzen wrote:
>
>
>
> do you still have your "inspectors" folder in your "patches" folder ?
> maybe you moved it accidently or changed or erased the path for it …
>
>
> Quote: wittlist wrote on Wed, 10 January 2007 17:52
> —————————————————-
> > Hi all,
> >
> > developed a fault with max and my inspector no longer seams to work,
> >
> > when ever i select on an object and apple-I or click on get info the
> > inspector does not open and the max window says error: no inspector
> > for …
> >
> > any ideas??
> >
> > thanks in advance
> >
> > scott
> >
> > max/msp 4.6.2
> > 10.4.8
> > MacBook
> >
> —————————————————-
>
>
> –
> karrrlo
> http://www.marswalkers.org
> http://www.fleeingbirds.org
>


January 11, 2007 | 8:50 am

it is possible, but you need ze right hardware.
unibrain offer a firewire passthru on their low budget fire-i line. i
connected two of those to one firewire slot, if you want better
throughput consider adding a second firwire card to your pbook, but
usually one will do. remember that computer vision is an intense
operation. more then 320 240 is usually not recommend on a lowly cpu.
if you had a desktop pc i would recommend two cheap flyview card, i
got my xp to run with 3 or 4 card with 16% cpu utilization before
processing the streams.
don’t use dv , it has latency problems and the native resolution of
full pal/ntsc is a resource hug.
as for the fps, you have to experminte, 30 (and less) is enough for my usage

btw. this is a jitter question, why not ask in the jitter list.
On 1/11/07, Jaime Oliver wrote:
> Hello,
>
> do any of you think it is possible to have to TWO live cameras connected into a
>
> PowerPC G4
> 1.67 GHz
> 512 MB DDR SDRAM
> L2 Cache 512 KB
> Bus Speed: 167 Mhz
> OSX 10.4.8
>
> for live video tracking (mainly find bounds)?
> if so, is 30 fps per camera reasonable?
>
> thanks,
>
> J
>
>
>
> On 1/10/07, karl-otto von oertzen wrote:
> >
> >
> >
> > do you still have your "inspectors" folder in your "patches" folder ?
> > maybe you moved it accidently or changed or erased the path for it …
> >
> >
> > Quote: wittlist wrote on Wed, 10 January 2007 17:52
> > —————————————————-
> > > Hi all,
> > >
> > > developed a fault with max and my inspector no longer seams to work,
> > >
> > > when ever i select on an object and apple-I or click on get info the
> > > inspector does not open and the max window says error: no inspector
> > > for …
> > >
> > > any ideas??
> > >
> > > thanks in advance
> > >
> > > scott
> > >
> > > max/msp 4.6.2
> > > 10.4.8
> > > MacBook
> > >
> > —————————————————-
> >
> >
> > –
> > karrrlo
> > http://www.marswalkers.org
> > http://www.fleeingbirds.org
> >
>


January 11, 2007 | 9:19 am

you’re right, I will write to that list, it’s just came natural to
write to this one.

thank you for your info, i’ll look more into it and comment on my
results.16% is excellent, i hope i make it that low.

On 1/11/07, yair reshef wrote:
> it is possible, but you need ze right hardware.
> unibrain offer a firewire passthru on their low budget fire-i line. i
> connected two of those to one firewire slot, if you want better
> throughput consider adding a second firwire card to your pbook, but
> usually one will do. remember that computer vision is an intense
> operation. more then 320 240 is usually not recommend on a lowly cpu.
> if you had a desktop pc i would recommend two cheap flyview card, i
> got my xp to run with 3 or 4 card with 16% cpu utilization before
> processing the streams.
> don’t use dv , it has latency problems and the native resolution of
> full pal/ntsc is a resource hug.
> as for the fps, you have to experminte, 30 (and less) is enough for my usage
>
> btw. this is a jitter question, why not ask in the jitter list.
> On 1/11/07, Jaime Oliver wrote:
> > Hello,
> >
> > do any of you think it is possible to have to TWO live cameras connected into a
> >
> > PowerPC G4
> > 1.67 GHz
> > 512 MB DDR SDRAM
> > L2 Cache 512 KB
> > Bus Speed: 167 Mhz
> > OSX 10.4.8
> >
> > for live video tracking (mainly find bounds)?
> > if so, is 30 fps per camera reasonable?
> >
> > thanks,
> >
> > J
> >
> >
> >
> > On 1/10/07, karl-otto von oertzen wrote:
> > >
> > >
> > >
> > > do you still have your "inspectors" folder in your "patches" folder ?
> > > maybe you moved it accidently or changed or erased the path for it …
> > >
> > >
> > > Quote: wittlist wrote on Wed, 10 January 2007 17:52
> > > —————————————————-
> > > > Hi all,
> > > >
> > > > developed a fault with max and my inspector no longer seams to work,
> > > >
> > > > when ever i select on an object and apple-I or click on get info the
> > > > inspector does not open and the max window says error: no inspector
> > > > for …
> > > >
> > > > any ideas??
> > > >
> > > > thanks in advance
> > > >
> > > > scott
> > > >
> > > > max/msp 4.6.2
> > > > 10.4.8
> > > > MacBook
> > > >
> > > —————————————————-
> > >
> > >
> > > –
> > > karrrlo
> > > http://www.marswalkers.org
> > > http://www.fleeingbirds.org
> > >
> >
>


January 11, 2007 | 10:54 am

I use two webcams regularly at 15fps, 320×240. I had to fool around a bit with the settings to decrease the cpu usage, but that’s a standard problem. Now, with a laptop PC running XP and a p4 at 3Ghz, I can track motion, use the images being produced and do some rather heavy rendering in an opengl environment as well as trigger and control samples. I was acutally suprised that this machine could handle all of that, but it does, and peaks out at around 95% cpu usage, although typical is about 85%. Set the rendering metro to around 60 and tweak the webcam settings until you get what you need, but it should be possible.
As for myself, I would be interested to know what experiences people have with cpu usage and capture-cards; usb eats up resources.


January 11, 2007 | 6:37 pm

>>
>>do any of you think it is possible to have to TWO live cameras
>>connected into a
>>
>>PowerPC G4
>>1.67 GHz

I used up to 4 cams on a similar set-up – fire-i by unibrain, daisy-chained.

no problem

best

kasper

Kasper T. Toeplitz
noise, composition, bass, computer

http://www.sleazeArt.com

http://www.myspace.com/sleazeart


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