ffmpeg is a CLI (command line based) utility for processing media files. It is a framework with a multitude of features and, because of it’s open source license, it is the base for many widespread apps such as VLC, YouTube, iTunes and many more. A number of Linux video editors use ffmpeg underneath the GUI.
What I love even more about ffmpeg is that it can be used on it’s own to accomplish many processing tasks in a very simple manner (with one or two commands). However, it’s a very powerful program that can be used in more complex ways and even replace an editing workflow.
In this ffmpeg tutorial, I’ll show you how to install ffmpeg and I’ll be covering it’s different uses. I’ll even get into some more complex features.
Source: Install and Use ffmpeg in Ubuntu & Other Linux [Full Guide] (It’s FOSS)