If you need to extract image frames from a video file, here is an easy (and free!) way to do just that.
If you don’t have VLC Media Player, download the latest version here. Open VLC Media Player and open the video file that you wish to extract image frames from. Open Tool Preferences.
Under Video (top icon), select Show All Settings (it will default to simple settings only).
Expand the Video Filters section and select “Scene filter” (Video⇒Filters⇒Scene filter).
Fill in all of the specifics for your purposes and the location you wish the image files to save to. Head back to the main VLC Player interface, play the video, and voila! Your image files will be saved to the designated file location.