A zero-based index of the title; where the title will be inserted in the list of titles. Pass -1 to append the title to the end of the list.
The name for a group of related video files (called "Chapters") on your DVD. For example, for a DVD called "My Summer Vacation," you might have the titles "Water Skiing," "New Friends," and "Hiking." For each of those titles, you might have one or more different video files.