What is the simplest way to encode with xvid

I have a collection of home videos. I can import them from the camera as .avi files. From there, I would like to encode them into mpeg4 videos, but I would like to use xvid - I heard it complied to the mpeg4 standards. I have been reading a lot of forums, but there is nothing that says what the command line is or something simple. I know several Arch users have used xvid. Is it possible to encode with xvid from the command line? If not, how can I do it?
Oh, I have also installed xvidcore via pacman, but there doesn't seem to be an exvidenc like I thought there would be.
Thanks for any help

I think mencoder is unbeatable, it's man page is quite lengthy but worth reading carefully as there's loads of good info there.
Basically, you can do something like this:
cat film.avi | mencoder -oac mp3lame -lameopts cbr:br=64 -ovc xvid -xvidencopts bitrate=1000 -vf crop=720:544:24:16,pp=lb -o output.avi
That's a really rough guide and may not work how you want it to - there's tons of switches and options you can apply if you want.

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