opencv 3.1 java video file not opening

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Hi

my following code is not working when i try to open a local video file using opencv 3.1 in java. but when i try to read web cam its works. It a windows8 64bit machine

VideoCapture      capture =  new VideoCapture();

capture.open("C:\\Test\\SampleVideo_1280x720_1mb.mp4");

System.out.println("\nopen :"+ capture.isOpened()); // it print false

Thanks Novin