Hi,

I tried to use a stereo USB webcam (that works correctly under other OS's) with 
OpenCV, using Snow Leopard's QTKit. I could list the 2 cameras but always 
produced a crashe when trying to get image data from the second. Googling for 
it, I found some info saying that you can't have 2 cameras on the same USB bus.

If this info is correct, then you may be stuck in the same dead end.

Emmanuel

> From: Nathan Sims <[email protected]>
> Subject: Re: 3D movie
> To: Christopher Wright <[email protected]>
> Cc: Quartz List <[email protected]>
> Message-ID:
>    <[email protected]>
> Content-Type: text/plain; charset=us-ascii
> 
> On May 5, 2011, at 9:41 AM, Christopher Wright wrote:
> 
>>> QuickTime doesn't seem to directly support this, but I'm hoping that QC 
>>> might... I would like to take 2 camera video feeds and combine them to 
>>> produce "3D" output when viewed with red/blue glasses. Would there be a way 
>>> in QC to do this?
>> 
>> google quartz composer anaglyph
>> http://paulbourke.net/texture_colour/anaglyph/   is the first hit, and there 
>> are likely to be other good resources as well.
>> 
>> Your biggest problem might be getting 2 camera feeds working.
> 
> How right you are! Getting two camera feeds working is my stumbling block. I 
> have the basic composition working, and can use it successfully with two 
> prerecorded input movies. But placing two Video Input patches in the 
> composition, only one camera gets activated, regardless of how I set the 
> input selector of the video patches. For this test, I'm using two external 
> Firewire iSights with a Belkin Firewire hub. Note: I can use one of the 
> external iSights and the internal iSight of my MacBook simultaneously, but 
> the video feeds of these two cameras are too different for stereo viewing to 
> work well. 
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