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Re: Sequence Grabber: subsampled images with multiple cameras on different FW ports?

Subject: Re: Sequence Grabber: subsampled images with multiple cameras on different FW ports?
From: Kevin Quennesson <email@hidden>
Date: Mon, 20 Feb 2006 21:38:57 -0500
Delivered-to: email@hidden
Delivered-to: email@hidden

Thanks.

I have a camera connected to the *front* FW400 port and another at the *back* FW800 (using a FW800->FW400 cable).

I get the same problem with any kind of combinaison (2 at the back, etc.). Does that mans there is only one firewire bus on my Powermac -- april 2005 generation???

Would adding a firewire PCI card solve this? Maybe somebody tried and I have a brand to recommend? I have been told I had to look for a PCI-X low voltage card (3.x volts), since firewire extension cards are not sold on the store anymore.

Thanks for any help!

Kevin

Le 20 févr. 06 à 21:07, Mike Woodworth a écrit :

i had the same problems... the only work around i found was to run them at lower frame rates, or on seperate FW busses.
mike
--
Mike Woodworth
email@hidden
On Feb 20, 2006, at 8:23 PM, Kevin Quennesson wrote:
Hi,
I based a project upon the WackedTV sample code.
However when I am trying to use multiple cameras - and camcorder connected to the front port of my g5 and an iSight connected to the back FW800 *or* back FW400, the resolution seems to be downsampled by 2 automatically, or more exactly the calls CVImageBufferGetCleanRect(pixelBuffer) and CVImageBufferGetDisplaySize(pixelBuffer) in the displayData callack of SGVideo.mm returns a size subsampled by two.

I understand why this would be on the same FW400 port, but in my mind the FW800 and front FW400 were independant? Why does this happen? Do I need to change some code to avoid that?
Thanks for any help!
The subsampling happens as soon as I *plug* a second camera, I do not even need to start capturing.

.:;.; ? http://www.kevinquennesson.com .::".;.; ;; ;

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