It will be a necessary tool for any video editors, movie fans and video analyst. Many video formats can be supported by this app, such as mov,avi,mp4,mpeg,m4v,3gp,3g2,m4v etc.
http://itunes.apple.com/us/app/video-image-extractor/id426615036?mt=12
http://itunes.apple.com/us/app/video-image-extractor/id426615036?mt=12