$ sudo apt-get remove libavcodec53 

Uninstall libavcodec53 including dependent package

If you would like to remove libavcodec53 and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove libavcodec53 

Use Purging libavcodec53

If you use with purge options to libavcodec53 package all the configuration and dependent packages will be removed.

$ sudo apt-get purge libavcodec53 

If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.

$ sudo apt-get purge --auto-remove libavcodec53 

See Also,