Forums > Jitter

Multiple camera on a laptop


ken
June 14, 2006 | 10:58 pm

I am trying to write a patch for a G4 15" laptop using Max 4.5.7 and
Jitter 1.5. I want to have 5 cameras running on the same laptop. The
cameras are porting in through a firewire hub that is powered.

Ken
ken@kennethfeinstein.com
http://www.kennethfeinstein.com
646-220-8257


June 14, 2006 | 11:13 pm

On Jun 14, 2006, at 3:58 PM, Kenneth Feinstein wrote:

> I am trying to write a patch for a G4 15" laptop using Max 4.5.7
> and Jitter 1.5. I want to have 5 cameras running on the same
> laptop. The cameras are porting in through a firewire hub that is
> powered.

Depending on the camera type and resolution at which you are
transitting he capture data o he computer, it sounds like you would
probably saturate the FW bandwidth. I think you should be able to
deliver 3xIIDC @ 640×480 streams per 400Mb/s FW port (a hub does you
no good here as they all share the single port’s BW). You might
investigate PCI slots which provide additional FW ports. However
you’ll also have to investigate saturating the PCI bandwidth and deal
with CPU overhead, perhaps resulting in less than applicable
framerates. Your application might require using multiple computers.

Here’s an Apple Tech note on the subject:

http://developer.apple.com/qa/qa2004/qa1365.html

More info by googling on IIDC bandwidth.

-Joshua


June 15, 2006 | 10:44 am

see unibrain support
< http://unibrain.com/Products/VisionImg/tSpec_Fire_i_BC.htm>page
http://unibrain.com/download/pdfs/Fire-i_Board_Cams/camera_b ytes_pkts_3Public.pdf

ptgrey has lots of knowledgebase articles
http://www.ptgrey.com/support/kb/index.asp?a=4&q=22&#038; ST=bandw idth


June 16, 2006 | 5:15 pm

i used – with success – 4 FW cameras on a Pb titanium (1 giga)

those were unibrains, daisy chained, without being powered (other
than the FW port)

since i did not encounter any special problems (the rest of the
jitter patch was pretty simple – just pick at random one of the 4
images and send this to the 2nd screen for a duration chosen at
random between x

best

kasper

Kasper T. Toeplitz
noise, composition, bass, computer

http://www.sleazeArt.com


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