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Using 2 Webcams Simultaneously

Can someone tell me if it is possible to capture from 2 webcams simultaneously at a resolution of 640x480? When capturing at a resolution of 320x240 or less, everything is fine, however when capturing at a resolution greater than that then I get the following the error:

libv4l2: error turning on stream: No space left on device

VIDIOC_STREAMON: No space left on device

Does anyone know how to solve this problem?