MovieDek. Extract frames from movies in batch and save them as files on your computer.
Use the Preferences window to specify the rate of frame grabbing, output image type, image scaling, frame range etc.
MovieDek is part of the Limit Point Software Utilities Bundle : http://www.limit-point.com/Utilities.html. Purchase a Utilities password to activate all the utilities, including MovieDek. Updates are always free, new products always included!