I have problems with getting usb web cam working.
I'm trying to get stream from camera with mjpg-streamer.
If I plug web cam directly to raspberry pi, I can get at about 10 fps at 480x360, but 640x480 is not working, image is loading very slow (1 frame per 20+ seconds) with artifacts or not loading at all. CPU is not loaded fully, 30% max, but command line responds slowly, sometimes ssh connection breaks. Strange effect.
I tried to plug web cam via usb hub with extra power supply, but then I can't get fps > 1 even at 160x120, works very slow.
I also tried another web camera on raspbian and arch linux with same results.
Something similar is described here: http://www.raspberrypi.org/phpBB3/viewt ... 0&p=130610