I currently have 2 web cams on my USB bus. I can select either one in iChat...

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On May 10, 2011, at 12:18 PM, D'Angelo Emmanuel wrote:

> 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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