I really have no movie editing experience, so when the need to try to splice together four large .avi files arose, I was flummoxed for want of a better word.
However, a little googling quickly provided what looks like a great CLI command to do just that. I got it from this post. To run the command you need to install mencoder (sudo apt-get install mencoder) and then run
mencoder -forceidx -ovc copy -oac copy -o output.avi input1.avi input2.avi …
Works great although you must make sure that all of the input avi files have the very same fps and resolution. Otherwise it’ll just error out.

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11/04/2011 at 04:46
Matt Jones
Thanks for this, it has helped me out alot joining video files.