OpenCV 3.0 BETA - can't open video files

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When i want to open video file with VideoCapture, the isOpened() returns everytime false. But VideoCapture works with the camera. I use build from the opencv.org. It worked few days ago, but i forgot what i did to work. :P

So my question is, what should i do, if after VideoCapture video_in("video.mp4"); video_in.isOpened() returns false? Is it wrong settings, or did i forget add some libs?

Thank you.

[EDIT] Problem solved, i coied opencv_ffmpeg300.dll to debug folder, and it works now.