opencv 3.1 java video file not opening

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. VideoCapture capture = new VideoCapture(); capture.open("C:\\Test\\SampleVideo_1280x720_1mb.mp4"); System.out.println("\nopen :"+ capture.isOpened()); // it print false Thanks Novin