Capturing webcam stream under linux

I'm trying to get images from a minoru3d webcam, which is actually two Vimicro webcams plus a USB hub in a single package. The problem is, opencv always takes streams in maximum resolution, making simultaneous capture from two webcams impossible(due to usb constraints). How do I set resolution or FPS? For some reason, opencv calls

cvSetCaptureProperty( capture, CV_CAP_PROP_FRAME_WIDTH, 320 );
cvSetCaptureProperty( capture, CV_CAP_PROP_FRAME_HEIGHT, 240 );

don't work. I don't need to work with opencv, any other library doing the same job is good for me. The webcam uses uvc drivers from kernel 2.6.30, with v4l2. I tried the custom module here: http://linuxtv.org/hg/~pinchartl/uvcvideo on my Ubuntu box with 2.6.27 kernel.

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I used luvcview and v4l2cam for my purposes. 2 is specifically written for the Minoru.

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