How to keep audio compressed?

[Esc]

I have some avi files that I need to alter & recode using AviSynth. As a result, I get uncompressed audio after the recoding. Is there a way to keep mp3 audio other than manually demux it from the original avi and re-mux it into the new one. I have dozens of videos and would like to keep manual labor as low as possible.

[Mug Funky]

if you want to keep manual labour to a min, try doing the muxing with a command line app like mencoderor ffmpeg. then you can (automatically?) make a batch to do them all at once.

[Esc]

Thanks for the suggestion. I'll try that way!