Video a different size when demuxed?

[ArtOfLosingMFZB]

So I have this DVD. It is a japanese anime DVD (episodic) and I wish to add an english track and subtitles. I've run into something interesting, however. On the original DVD, there is room to spare. But when I demux the audio and video from the DVD, and then try to put those same audio and video tracks back together in DVDLab Pro, the file is now oversized for a regular double layer dvd. How is this possible? My best guess, though it is just a guess--please correct me if you have a better idea, is that since the original animation doesn't have many frames per second, they were able to somehow encode the video in a way that contains less frames, but still plays at regular speed? The video is NTSC. Any ideas as to what is going on here and what I can do to successfully demux and remux without messing anything up? Thanks in advance.

[guns1inger]

DVD doesn't allow for variable frame rates. If you did just Demux then you have extracted the DVD as-is, so it should fit.

That said, how did you demux ?
Does the DVD have multiple-video streams ?

Depending on how a disc was authored, branching discs can appear to much larger titles that they do because the same footage gets repeated. For example, the Star Wars DVDs have different language versions of the prologue text crawl. Some tools see each these, together with the main movie, as different titles. They therefore see the disc as containing 15GB of data, when it is impossible for this to occur.

If your episodes all use the same title then only one version of the title would have to be stored on the disc, saving space. However when the disc gets ripped, this single clip may be added to every episode, increasing the combined size.

[ArtOfLosingMFZB]

It is possible that the DVD has multiple video streams. The opening and closing titles are the same for each episode. I thought about this but I have no idea how to verify if that is how the DVD was made. Is there a program that would allow me to see the DVD's structure and extract the files as they were authored instead of extracting the resulting branched movies?

[manono]

You didn't answer the question - how did you demux the DVD? Even if there are multiple angles, interleaving, or episides all in the same PGC, a proper demux wouldn't give you files whose total size is greater than that of the source.

I suspect that's what you did - that you demuxed the entire thing and then demuxed the episodes again separately.

Is there a program that would allow me to see the DVD's structure and extract the files as they were authored instead of extracting the resulting branched movies?

VobBlanker will show you if there a 0 MB episodes that you may have demuxed. In fact, can you post a VobBlanker pic of the DVD? Open the DVD, highlight the VTS in the upper window so it appears in the lower window. Then save a pic and post it here.

And why would you want to add an English dub track to a Japanese DVD anyway? Subs, yes, dub, no.

[PuzZLeR]

I suspect that's what you did - that you demuxed the entire thing and then demuxed the episodes again separately.

Programs like NeroVision do this, automatically, when using Import - particularly with discs that have several episodes, versions, tracks, etc., and it is a convenience depending on how you look at it. Nevertheless, an experienced user can easily detect when this is happening and deal with it.

I too would love to know what was used to demux.

Personally, I would just demux all streams as .mpg, and audio files, and then use a lossless MPEG editor like VideoReDo, TMPGEnc MPEG Editor or Womble to manipulate the streams, remux and re-author to my taste with an author tool. But that's me.

And why would you want to add an English dub track to a Japanese DVD anyway? Subs, yes, dub, no.

Cause it's hilarious? :P

EDITED: For a couple of stupid typos. Arghhh.

[AlanHK]

How big are the:

1) original (VOB?) files

2) separate demuxed files

3) your new audio track, and what format is this -- if wave, that's your problem, should be AC3 (compressed).

[ArtOfLosingMFZB]

Sorry, I used DVD Decrypter for my demuxing. I demuxed to a separate m2v and ac3 track. I demuxed just the main feature (all of the episodes) as one (runtime 02:27:51), I didn't demux each episode individually.

How big are the:

1) original (VOB?) files

2) separate demuxed files

3) your new audio track, and what format is this -- if wave, that's your problem, should be AC3 (compressed).

1) 7.57 GB (including menus)

2) m2v=7.33 GB ac3=474 MB together=7.8 GB (main feature/all episodes only)

3) 474 MB AC3

However, when I create a DVDLab pro project (Simple, movie only), and place those same tracks into movie one, the projected size in the lower right-hand corner claims it to be 8.63 GB.

I hope this helps, thanks for replying, I really appreciate it.

*Oh, and I'm trying to include the dub because my brother prefers it. Don't ask me why, the english dub to this show is atrocious, but he doesn't seem to mind.

[manono]

It looks as if you did demux it properly, then. Is there any particular reason you have to use DVDLab Pro for this? Don't you want to keep the original menus when done? Whatever is happening to the size, it seems to be a happening in DVDLab Pro.

The "normal" way to do this is to demux using PGCDemux, replace or substitute the new audio and/or subs, reauthor using Muxman, and then replace the new DVD back into the original using the "Replace" button of VobBlanker. By demuxing using PGCDemux you also get the chapters and subs, something DVD Decrypter isn't going to supply you with (although it's possible to get a chapter list from it with some tweaking).

If it were I, I'd tell my brother he's an idiot and refuse to supply him with an English dub.