Just for fun I thought I'd try to get 2 webcams running at the same time with Ubuntu. After figuring out how to launch VLC twice, I asked it to play /dev/video0 in one window, and /dev/video1 in the other. One at a time worked well, but I couldn't get both to work simultaneously.
Then it hit me: there isn't enough usb bandwidth for both. So ratcheting the resolution down to 320x240 for each one, it works!
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