multiple angles on Shrek. And Cells

[mijman]

Using smartripper, I find three angles for the shrek main movie. Two of them are 1:29: (sec) and the third one is 1:30: (sec). What is going on here? It rips fine, using the 1:30 but obviously, not all 3 are on the disc. The only difference I can find so far is that the 1:30 one has an extra cell in chapter1. Is there really any difference between these?
And for that matter, why do some chapters have more cells than others? What are these cells? I would guess they are frames and such, but they don't seem to be. Do encoded mpgs have these Cells? If not, what makes them?


<font size=-1>[ This Message was edited by: mijman on 2002-01-09 15:56:45 ]</font>

[KoalaBear]

Cells are the fundamental unit of addressable playback for DVD -- "atoms," as it were, from which larger logical constructs such as PGCs (Program Chains) and chapters are assembled.

The cell concept allows you to have, say, PG and R rated versions of a movie on the same disc without encoding the whole movie twice. For example, if the parental control is engaged, the DVD player would follow the PG-rated program chain in a seamless fashion to construct a milder version of the movie for the kiddies.

Alternately, a title might be constructed in a choose-your-own-destiny fashion in which the next program chain to be played depends on the key that you press at a particular decision point. This facility is used to good effect on the Shrek DVD to implement the magic mirror and trivia games, but the possibilities are endless.

Cells are composed of MPEG segments, but they don't exist outside the DVD specification.

<font size=-1>[ This Message was edited by: KoalaBear on 2002-01-09 16:42:05 ]</font>

[vitualis]

As what KoalaBear said.

I don't remember the Shrek DVD specifically but I don't think that there were any huge differences between three three titles.

However, depending on the DVD there can be large differences. For example, The Matrix uses seamless branching for the "Follow the White Rabbit" feature and ID4 uses seamless branching to have both the standard and "special" versions of the movie on the same disc (without wasting disc capacity).

Regards.

[BOB-C]

wow!!! someone else out there whos converted SHREL too! jeeez!! i spent 3 weeks looking at that bloody thing every day i think i know that movie intimately by now...anyway waht i got out of it was: 1: 400 x 224 avi with 22050 khz stereo mp3 wav audio (1cd) 2: 512 x 288 avi with 22050 khz mp3 wav audio (1cd) 3: vcd 352 x 288 pal vcd 2CD (actually the bulk of the movie would fit 1 CD since the ratio is 1 CD=1 hour and since the movie is 1hr 26 mins approx its like the ending scenes are on 2nd disk (the thing that adds to the lot is bloody 5-6 minutes of end credits - forunately vdub or nandub lets you lower the bitrate at the beginning frame of movie end credits thus keeping the file down...nice to know thers a shrek fan out there...