libavcodec-extra-53 software package provides Libav codec library, you can install in your Ubuntu 12.04 LTS (Precise Pangolin) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libavcodec-extra-53
libavcodec-extra-53 is installed in your system.
Make ensure the libavcodec-extra-53 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libavcodec-extra-53 *
You will get with libavcodec-extra-53 package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Libraries |
| Package | libavcodec-extra-53 |
| Version | 4:0.8.17ubuntu0.12.04.1 [amd64 |
| Description | Libav codec library |
| Sub Section | libs |