Another Preview post - FFMPEG for nextcloud 28

Nextcloud Hub 7 (28.0.2)
Linuxserver docker container
Unraid 6.12.6
PHP Unknown

I thought this version may have FFMPEG installed as stock but not mp4 previews…

Assuming i need to install FFMPEG, and i have searched high and low for a very basic guide on how to do this. Can anyone help me out?

I know how to enter the Nextcloud config and such, I have set up a few simple things like maintenance window and default phone code but i and quite new and learning. please be patient.