ffmpeg is missing code example

Example 1: ubuntu 18 ffmpeg install

sudo apt install software-properties-common
sudo apt update
sudo add-apt-repository ppa:jonathonf/ffmpeg-4
sudo apt install ffmpeg
ffmpeg -version

Example 2: install ffmpeg mac

There are three options, sorted by complexity:

Homebrew (or other package managers)
Static builds
Compile yourself
To follow this you need to have a bit of knowledge using a terminal/shell under macOS.