1.) In a professionally-produced DVD, if a certain scene has an alternate angle, is the second angle an actual part of the same video file, or is it a separate video file that is accessed when the second angle is selected?
For instance, in the EditDroid version of A New Hope, how did the authors make the alternate crawl selectable? Is the alternate crawl a part of the main video file, or is it a small file that is accessed when the alternate crawl is selected?
And, last, where does the audio fall into this? Is there audio for each angle, or is there one main audio source?
2.) Is seamless branching the process used for multiple angles, or is it different? Would a seamless branch be if a scene is added that is not in one of the selectable variants of the movie? Is the EditDroid crawl considered a seamless branch, or is it just an alternate angle?
3.) Whatever the EditDroid alternate crawl is technically, I am wanting to do something along these lines in an edit I am working on. What program did the EditDroid team use for this? What programs will let you do an alternate angle? How do you integrate any alternate angles into a menu that allows you to select such?
I really can't find an overview of how to do this anywhere else. If anyone can help, please do or point me in the right direction!