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Did you use the tutorial on this link to open a Video?

http://docs.opencv.org/doc/tutorials/highgui/video-input-psnr-ssim/video-input-psnr-ssim.html#videoinputpsnrmssim

Furthermore, be sure that all the codecs are somehow installed on your system. You could try to manually download and install ffmpeg here

http://ffmpeg.zeranoe.com/builds/