OpenCV capture from USB not iSight (OSX)

Question

I am having trouble accessing the external USB camera instead of the built-in iSight when using OpenCV with a MacBook Pro under Mac OSX.

When passing an argument to

Answer 1

I was just messing with the same problem, macam drivers are 32 bit, if your opencv install is compiled as 64 bit it won't work. I end up installing opencv twice 64 bit with mac ports and 32 bit with howebrew whenever I am using ps3eye I switch to 32 bit version.