$ sudo apt-get update
$ sudo apt-get install libmpeg2-4 

libmpeg2-4 is installed in your system.

Make ensure the libmpeg2-4 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libmpeg2-4 *

You will get with libmpeg2-4 package name, version, architecture and description in a table

libmpeg2-4 package basic information: