It would work without a hitch if the Pi didn't have all the problems it has. Just as an example, there's one of these Allwinner tablet boards that runs android that was shown displaying video from 4 different webcams at the same time in android.dktucson wrote:I do security cameras as a side business and deal with computer dvr's. The old Pico2000 capture cards had a single chip splitting 30fps by 4 inputs for 7fps (halty & jerky). even with it's own video processor (BT878chip) you'd want a minimum of a 1.4 ghz machine and 512mb ram.
USB bandwith is even worse--try getting 4 usb cams to work on a quad core loaded for bear...t's just not going to work