Let’s say you have a movie that you downloaded, and it’s split into 2 AVI files. Wouldn’t it be nice to join these two files together into one seamless AVI file? It’s easy.

First, you need to download a copy of MPlayer from here. Then just execute this command from the command line:

/path/to/mencoder -oac copy -ovc copy -forceidx -noodml -o joined.avi part1.avi part2.avi

This works for Windows and Linux, and you can join as many parts as you want, just put them in the correct order in the command.

Simple as that!