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WebCam not working

Hi. I am trying to run this simple code and it is not working but it used to. I am using version 2.4.9 in Code::Blocks.

image description

I have also tried using Visual C++ but the problem is the same. The VideoCapture object is returning an empty frame. This is not only the case with the first frame, but also every other. As I said, this used to work but for some strange reason now it does not. It still works on Linux Mint 13.7.

Any ideas what could be causing the problem?