john@john-P-6831FX:~$ sudo apt-get install libavcodec-extra
[sudo] password for john: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libavcodec-extra is already the newest version.
The following packages were automatically installed and are no longer required:
  gir1.2-totem-1.0 gir1.2-totem-plparser-1.0 kde-l10n-engb libbonoboui2-0
  libbonoboui2-common libgconfmm-2.6-1c2 libglademm-2.4-1c2a libgnomecanvas2-0
  libgnomecanvas2-common libgnomeui-0 libgnomeui-common libgtkmm-2.4-1c2a
  libtotem0 pulseaudio-module-gconf pulseaudio-module-zeroconf totem-common
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 8 not upgraded.
john@john-P-6831FX:~$