How to repair video files?

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http://superuser.com – I have a corrupted micro SD card. With huge trying I could to recover it's data using recuva tool, but now my files are corrupted also. They are video file with some famous extensions such as 3gp, mp4, flv, wmv, avi. My video file players are VLC and Media player classic. The media player classic says, "can not render the file" and VLC doesn't show anything. Is there a way to repair these video files? (HowTos)