Remuxing AVI per CLI

[YouDontKnowMe]

well I've got a few avi files with 2.0 mp3 sound (animes dvd-rips) after I watched it, I bought the dvds because I like the anime very much and supporting the companies with a few bucks is always nice... well now my problem is that these avis has got 2.0 mp3 sound... I want to kill this 2.0 mp3 sound and change it against an 5.1 AC3... via cli... is there any way to do so?

xvid + 2.0 mp3 = avi ~~> xvid + 5.1 ac3 = avi <--- how it should wotk...

thanks in advance

[Nicholi]

You can use AVIMux GUI through the command-line (despite the name :P). You just have to write a short script (http://www.alexander-noe.com/video/amg/script.html) beforehand in its language, or have some batch automation generate it for you. The only things that would be changing are the inputfile, new input audio and outputfile.

[YouDontKnowMe]

I really dont understand anything... could you write me an bat which remuxxes ALL avi files with the ac3 that has got the same name ?