Can DVDpedia catalog movies backed up on hard disk from the video_TS folders?
You can search for the movie information via title and then link the VIDEO_TS folder to the entry for the movie by dragging it over the info view for that movie in DVDpedia. You will then be able to play the movie directly from DVDpedia including the full screen mode. You can also drag VIDEO_TS folder over the DVDpedia icon to create an entry with the link, but you have to then fill the title and use the gear button on the bottom right of the edit window to search for more information (VIDEO_TS folders are scarce on actual movie information).