Lots of great info on here
Open-Awesome is built by the community, for the community. Submit a project, suggest an awesome list, or help improve the catalog on GitHub.
A comprehensive list of all ffmpeg commandline flags.
Where it all starts
Official FFmpeg man page
Docs for FFmpeg's powerful filter chains (scaling, cropping, concatenating, merging, etc.). This is one of my most visited links when working with FFmpeg