Adding 5.1 sound to an mpeg file?

[amiableakuma]

Here's what I'm doing - after decrypting a commericial DVD I own, I run AutoGK on the vob files I want - that gets me an AVI file. Then I make a few changes and run that AVI file through TMPG while using the sharpening/noise reduction filters for my own little "remastering job." Finally I take the outputed MPEG and put it in a DVD authoring program whereby I create a simple menu and burn it to a DVD-R to be able to watch on my regular DVD player.

^^^Okay, so I like this process and it's gets what I want done completed....HOWEVER, in the process I'm losing the original 5.1 or multi-channel sound mix.

I'd like to be able to keep the process nearly the same but also have the final mpeg and/or burned DVD-R featuring the 5.1/multi-channel surround sound as well. If doing so increases the file size, that's fine.

How would I go about doing this?

[steveryan]

Use DVD Decrypter to rip the audio then import into your authoring prog.

[amiableakuma]

So demux the audio to ac3 in DVD Decrypter and then add the ac3 to the video within the authoring program?

Will any authoring program mux & burn the two correctly so that the sounds plays perfectly on DVD or will only certain authoring programs do so?

And if so - which can I use?

I'd prefer to use DVDStyler - will that do it?