Convert .AVI to .MP4 in Linux with Mencoder

Convert .AVI to .MP4 in Linux with Mencoder:

$ mencoder input.avi -o output.mp4 -oac copy -ovc lavc -lavcopts vcodec=mpeg1video -of mpeg

*NOTES:
- where input.avi is the avi file you want to convert and output.mp4 your desired mp4 file name.
- the $ sign at the start of the command is to signify the terminal's prompt, no need to type this in.