Hi John,
I had the exact same problem at first. In the inspector for the Video Input patch, there is a place where you can hard-code in the dimensions from the iSight. By default the W and H are empty and you end up with 640x480. If you manually enter 640x480 on both patches, it works fine for me.
http://homepage.mac.com/johnneous/FileSharing42.html <--patch for a dual-camera 3D-glasses effect
I've had really good results with two iSights on a FW400 bus, but three will definitely choke. However, the symptoms will not be downsizing. One (or more) camera will just freeze up. (Or at least that's what happened with Wirecast.)
Pierre, how did you do the 5-camera trick without adding multiple PCI firewire cards? Did you only pull monochrome or did you downsize to 320x240?
Regards,
John Taylor
On Friday, February 03, 2006, at 05:17PM, Roland Torres <email@hidden> wrote:
>John,
>
>I recall that this came up a while back on the Firewire list, and the
>consensus was that 2 iSights at 640x480 far exceed the FW400
>bandwidth, so it "automagically" downgrades one to fill the remaining
>bandwidth for the second camera. IIRC, a single 640x480 signal takes
>up about 90% of the FW400 data bandwidth (but don't quote me on
>that). A FW800 hub won't help, of course, since the iSights are
>FW400, but if you had 2 FW800 cameras on the FW800 ports it should work.
>
>HTH,
>Roland
>
>
>On Feb 3, 2006, at 4:05 PM, John C. Randolph wrote:
>
>>
>> Ok, I got two more iSight cameras, and something's happening that I
>> don't understand.
>>
>> With two cameras installed, I put two video input patches in my
>> composition. The first one shows me a 640x480 image. The second
>> one produces a 176x144 image. It's rather jarring visually for one
>> to have so much less resolution.
>>
>> My system is a dual 2.0Ghz G5, with a GeForce 6800 Ultra, 256MB
>> VRAM, driving a 30" Cinema display. I have both of the cameras
>> plugged into the FW ports on the display. With three cameras, the
>> third input patch gives me an even smaller image.
>>
>> I've looked at the device settings for both of the input patches,
>> and they're identical. How do I get them both to hand me a 640x480
>> image, or failing that, get them both to the same size?
>>
>> Am I running out of FW bandwidth? Do I need to pick up a FW800
>> hub, and plug the cameras into that, or do I need to upgrade my
>> machine and video card?
>>
>> The input patches all defaulted to using CCIR-601-uyvy compression,
>> and there are a LOT of other choices. Would any of them help?
>>
>> Thanks,
>>
>> -jcr
>>
>>
>> John C. Randolph <email@hidden> (408) 914-0013
>> Roaming Cocoa Engineer,
>> Available for your projects at great Expense and Inconvenience.
>>
>>
>>
>>
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