libavfilter-extra-2 software package provides Libav filter 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 libavfilter-extra-2
libavfilter-extra-2 is installed in your system.
Make ensure the libavfilter-extra-2 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libavfilter-extra-2 *
You will get with libavfilter-extra-2 package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Libraries |
| Package | libavfilter-extra-2 |
| Version | 4:0.8.17ubuntu0.12.04.1 [amd64 |
| Description | Libav filter library |
| Sub Section | libs |