What exactly are different angles for?

[jellysandwich]

I know that for anime, one angle might
contain english credits while the other
angle would contain japanese credits.

But what are the different angles for
in normal hollywood sytle movies?

js

[Video Dude]

Same as anime :) .

Here in the US, most DVDs contain three languages: English, Spanish, and French. Some Hollywood dvds will then have different title screens for each language.

There a few movies that use the angles to display different angles of a scene. While watching a movie you can select the camera angle you like best. I remember back in 1997, this concept was heavily promoted while advertising the DVD format, but it never really became popular.

Other movies use angles for special features. Like "fun facts" and "how this movie was made".

[Mug Funky]

the R4 studio ghibli DVDs use multiangle to show storyboards as well as the feature. good thing about storyboards is you can crunch them real hard (1250 kbps for Pom Poko - that's smaller than a good-sounding DTS track and more useful) and they'll still look good, while leaving lots of room for the main feature (that people will be watching most of the time, after all).

only drawbacks are max rate for multiangle is 8000 kbps - all audio - all subs. throw in a half-rate DTS track and 2 5.1 ac3's and you've got a max bitrate of about 6300kbps - nowhere near enough. what's more, if you only multiangle part of the movie (like in the matrix), that maximum must carry through the entire movie - not just the multiangled bits. another problem is the GOP structure of angle 1 must exactly match the GOP structure of angle 2, making scenechange detection useless (unless you want to do the 2nd angle with a reeeally long i-frame list). this is why authors don't like DTS or multiangle all that much.

[jellysandwich]

Ah, ok. I think I get it now. I was a little confused,
since I thought those types of things were done in
separate PGCs altogether. If I remember correctly,
Finding Nemo was like that...

Thanks for the explanations guys.

js

[mpucoder]

only drawbacks are max rate for multiangle is 8000 kbps - all audio - all subs. That is "per angle", just so no one misinterprets it as the sum of all angles.
what's more, if you only multiangle part of the movie (like in the matrix), that maximum must carry through the entire movieNot true, only 1.5 seconds before the multiangle parts has to be at constrained bitrate, the rest of the movie is unconstrained.
"The Matrix" uses both seamless multiangle in the extra features, and seamless multistory in the main movie (and combined in places). The difference is multiangle is the same timeline, but with different video, while multistory alters the timeline (by adding or skipping material). Different titles are generally done using non-seamless multiangle, which does not require identical gop structure, and can even use different audio and subs - much easier to use. The only thing that must match is the duration. The drawback is you cannot switch angles during playback, but that would not be desirable in this use of multiangle anyway.

[influenza]

The drawback is you cannot switch angles during playback, but that would not be desirable in this use of multiangle anyway.

I only have one title that uses non-seamless multi-angle: die an other day. Both angles have different audio. I never noticed that I couldn't switch between the angles, though.