DOS multiplexing for DivX and/or other MPG?

[Figge]

Hi!

Excuse a perhaps strange question from a relative newbie...

Let me explain my problem:
I want to modify the sound level in a AVI file, using only DOS tools.
I have used FFMPEG.EXE to split the video and audio data apart - that works great (make separate AVI and MP3 files).
I have also modified the audio data (still the same length so it shall match, only volume changed with MP3GAIN.EXE dos program).

But!
Then comes my problem. How to join them back together.

I have found a tool called DIVXMUX.EXE that should (?) do the job but it just quits. I have tried on several videos with same result.

Is there any other way to do this in DOS, than by DIVXMUX.EXE ?
Can FFMPEG join them back together, just as nicely as it tore them apart? If so. What command line options? There are some many... ugh...

Please help!! Many thanks in advance.

[Baldrick]

It should work with ffmpeg, have you tried:

ffmpeg -i video.avi -i audio.mp3 -vcodec copy -acodec copy output.avi

ffmpeg -i video.mpg -i audio.mpa -vcodec copy -acodec copy output.mpg

?

[Figge]

It worked!! Thanks a million!!

I know what I did wrong.
I just assumed I could not provide the "-i" option more than once. I´d tried placing filenames after eachother but that did not work... Obviously, it needs the -i in front of each of them.....

THANKS!!