Hooked up my Canon camera as a PC webcam with ExtraWebCam. Worked fine with Skype/VideoLAN. OpenCV failed to open as DirectShow device. In fact, the DirectShow and code of other video capture methods are disabled because HAVE_VIDEOINPUT macro is not defined. (see cap.cpp)
Updated CMakefile according to this ticket and it worked.
https://code.ros.org/trac/opencv/ticket/491
At the beginning I thought the macro is somehow related to missing DirectShow SDK. Then I also installed DirectX-11 SDK (thinking that it comes with DirectShow), followed by Windows SDK for Windows 7 (.Net Framework 3.5SP1). Full installation of Windows SDK requires 4G of hard-disk space. Removing .Net related matters lowers the space needed to 1.5G.
'fback' is a good sample to test.
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