Multiple ac3 components

[DVmadman]

I was to back up a DVD that is too big to fit on a DVD-R disc so I would like to trim the fat out of it. The movie portion is 5.1gb. If I demux a VOB from the movie I find that is has 3 ac3 components (English Dolby Surround, English 5.1 Surround, and French). I was wondering if I could demux the whole movie, then remux it with only the English 5.1 Surround ac3 component as a means to trim the size.

If so:
1) How do I determine which ac3 component file is the one I want? Is there a tool that will tell me this?

2) What tool do I use to remux them back into VOB form so I can use Sizzle to author the new disk?

I would really like to do this without converting or recompressing the video. I want to keep full quality video.

thanks,

[pusa]

Use DVD2onex. It's easier when leaving/removing audio tracks of your choice when using this program. DVD2one.com

[DVmadman]

But dooesn't DVD2oneX automatically recompress the video? I don't want to degrade the video.

[pusa]

The movie portion is 5.1gb.

How can a 5.1GB video fit into DVD-R since DVD-R can hold about 4.7GB if you don't want to trim the video?

[deadsierra]

If he trims 2/3 of the audio in the movie portion, that might do the trick. And, I don't believe that DVD2oneX will upscale video, so try picking a ridiculous custom size, like 20000 MB. I don't know if that'll work though, got nothing to try it on right now. I'd like to hear your results though...

[galactica]

my experience:
you can do it, however you will get slightly (by say 100 megs) reduced file size. No biggie though, its VERY hard to notice the difference of that from the source files

best luck. just pick what your entire VIDEO_TS file size is as your user defined size for dvd2one

[DVmadman]

Galactica is right. The two "extra" ac3 components only amount to ~200mb. Stripping them would not get me under the DVD-R limit. I had to resort to DVD2oneX afterall.

The good news is that the video still looks great even ofter recompression.

Thanks all for the input.