GNU/Linux Desktop Survival Guide by Graham Williams
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Join Videos

$ mencoder -ovc copy -oac copy video1.avi video2.avi -o video.avi

To join multiple avi files into one big avi file:

$ avimerge -i a1.avi a2.avi a3.avi -o a.avi

I have found this to get the audio of the second file out of sync!