multiple cameras error in OS X

Hi,

Just starting a project that requires two webcams, using a Macbook Pro with OS X 10.4.8. One camera is the built-in iSight and the other is a cheap USB camera using macam drivers. Both work independently but not together. I stripped the example so it is very simple and still I can’t see what could be causing the problem. Perhaps I am going about this wrong?

Code:

  
  
void testApp::setup(){	   
	  
	camWidth 		= 320;	// try to grab at this size.   
	camHeight 		= 240;  
  
	vidGrabber.setVerbose(true);  
	vidGrabber2.setVerbose(true);  
	vidGrabber.listDevices();  
	// device ID 2: USB camera  
	// device ID 3: built-in I-sight  
	vidGrabber.setDeviceID(3);  
	vidGrabber2.setDeviceID(2);  
	vidGrabber.initGrabber(camWidth,camHeight);  
	vidGrabber2.initGrabber(camWidth,camHeight);  
	  
}  
  
//--------------------------------------------------------------  
void testApp::update(){  
	vidGrabber.grabFrame();  
	vidGrabber2.grabFrame();  
}  
//--------------------------------------------------------------  
void testApp::draw(){  
	ofSetColor(0xffffff);  
	vidGrabber.draw(20,20);  
	vidGrabber2.draw(20,20+camHeight);  
}  
  

Here is the console output:

  
  
[Session started at 2010-02-05 13:55:07 -0800.]  
-------------------------------------  
(unavailable) device[0] DV Video  
(unavailable) device[1] IIDC FireWire Video  
device[2] Intel Create and Share CS330 (SPCA501) - macam #0: Intel Create and Share CS330 (SPCA501)  
device[3] USB Video Class Video - Built-in iSight  
-------------------------------------  
OF_WARNING: No camera settings to load  
OF_ERROR: error: can't get default sequence grabber component  
OF_ERROR: error: unable to initialize the seq grabber  
  

When the program is running, the first stream displays video and the second is just a white box. The same is true if I switch the order of the cameras.

While the application is running, if I open a different application (e.g. the macam utility) I can still get the stream from the second webcam. So it seems the hardware is capable of capturing both streams.

Any ideas? Thanks