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Seamless Branching / Multiple Angles

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Okay. I am new to DVD editing, so please bear with me.

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!
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Just looked into that stuff myself but can't create seamless branch yet.

Multi angle you can see as 2 (or more) video tracks interleaved. As you can have more audio tracks you can have more video tracks. The multi angle tracks MUST have the same GOP structure.

(Seamless) branching is branching between different parts of video. If you want to skip a scene for instance you can use this. But to make it seamless is a bit more difficult and I don't know how to do it. With dvd-lab pro you have a branching option but it isn't seamless, there's a small pause at the bracnh point.

Editdroid crawl is multi angle. Don't know what program was used to create it. But with dvd-lab pro 2 you can also make multi angle titles.

Edit: The reason I want to create seamless branch titles is to make 1 dvd that has both the normal version of a film and for instance a version with deleted scenes reinstated.
Fez: I am so excited about Star Whores.
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mpucoder wrote this at doom9.org:

There are three types of interleave:
1) seamless multi-angle in which all paths (angles) have the same time, structure, audio, and subs
2) non-seamless multi-angle in which all paths have the same time, but do not need to have the same structure (a requirement to switch angles seamlessly) , audio, or subs
3) seamless multi-story. The paths are of different lengths, and everything is independant. You cannot switch paths during play, as the path is in the PGC. Within each multi-story path there can be multi-angles, either seamless or non-seamless.

Changing the cell type can work if the player can make the jump before its buffer runs out. All players are required to make certain minimum jumps, and this is the trick to seamless branching (multi-story) - to keep the jumps over the other paths within the distances all players should handle.


And:

Seamless branching is the optional inclusion/exclusion of material. The different PGCs will have different running times. It is very tricky to do, with various restrictions on the amount of material that can be jumped over based on bitrate (basically 30 seconds is the max without getting into really clever "puddle jumping").

You can also look here.
Fez: I am so excited about Star Whores.
Hyde: Fezzy, man, it's Star Wars.
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This all helps so much. Now that I know the terminology, it will make it much easier to seek out.

So, do you know any programs that do interleaving? That's what I mainly need.
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Super Mario Bros. - The Wicked Star Story
"Ah, the proverbial sad sack with a wasted wish."
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DVD authoring?

DVD-Lab Pro <This is my first choice! I love this program!
Scenarist
DVDit!
DVD maestro
ReelDVD
Even IfoEdit has an authoring option
Etc.

It seem Warner uses a Panasonic LQ-VD2000S to author seamless branching dvds.

If you've made a branching dvd you can make it seamless with TFDVDEdit, or so I read. But's it's for MAC OS.

Fez: I am so excited about Star Whores.
Hyde: Fezzy, man, it's Star Wars.
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Hey Andy, did you ever find a method to make (semi) seamless branching dvds?
Fez: I am so excited about Star Whores.
Hyde: Fezzy, man, it's Star Wars.