Java opencv Can not open a .mp4 video file by VideoCapture

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Hi there, System.loadLibrary(Core.NATIVE_LIBRARY_NAME); VideoCapture capture = new VideoCapture(); boolean result = capture.open("m.mp4"); System.out.println(result); The code above return a "false" value. Actually, the code works fine in a 32 bit Windows system (Windows 7). When I try to run it in my 64 bit system (windows 7). It fails. Does anybody know the reason? Thanks a million.