They overheat the CPU and the resulting videos come out choppy with dropped frames, poor sync, missing timestamps, and other problems. Unfortunately, most recording software can not get anywhere near that.
That should be all that is necessary to start experimenting. Some laptops have a built-in camera that claims to record HD 1080p at 30fps. It's amazing how much effort it takes to program a computer to do what our brains can do without even being aware of it! 3D vision requires triangulating distances from simultaneous video feeds.
This was a feasibility study for building a robot with eyes and ears. This computer vision research project discloses, through some advanced computer commands, how to record smooth, high-definition video from several sources at once using inexpensive hardware and cheap, USB webcams.
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