MConvert is small utility for batch processing media files with avidemux.

It can be convert one video/audio codec or container to another. Also posible to use audio/video filters 
and many other features from avidemux.

Generic process can be splited to two parts - edit project and convert files.

First, use  mconvert -e project.js sample.avi to edit project.js

Second, use mconvert -c project.js -o dst_directory file1.avi file2.avi ... 

or

mconvert -c project.js -o dst_media_file mediafile1