Command-Line Tool to Join Videos?

[RobDude]

I'm a bit of a developer, but I mostly just code for fun, and I have no experience with working with media files. So I've got this application that will download video files it finds on the internet, and they are often segmented. 01.mpg, 02.mpg, 03.mpg or 01.wmv, 02.wmv, 03.wmv

My program downloads them, but what I'd like to do is have it combine split files it finds from a single website - the format of the files I'm trying to combine will always be the same, but sometimes it might a .mpg or a .avi or a .wmv.

What I'm REALLY hoping for, is an application that I can use like this...

MoveMerge -i 01.mpg 02.mpg 03.mpg -o joinedMovie.mpg

Then I could just have my program, call that program - and everything would be great. If there is such a tool, could someone point me in the right direction?

[Soopafresh]

Look at mencoder , ffmpeg, and asfbin

Even if the files are of the same extension, all other dimensions must be the same as well.