libavfilter3 software package provides Libav video filtering library, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libavfilter3
libavfilter3 is installed in your system.
Make ensure the libavfilter3 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libavfilter3 *
You will get with libavfilter3 package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Libraries |
| Package | libavfilter3 |
| Version | 6:9.18-0ubuntu0.14.04.1 [amd64 |
| Description | Libav video filtering library |
| Sub Section | libs |