I like the community and the many examples that ffmpeg has. I used ffmpeg for many years as a developer, I created a player and a encoder by using the library. During my Ph.D I also use ffmpeg to create videos. You can find always a solution to do what you need, sometimes it is not easy to create the list of arguments used in the command line version but with the help how the users (stackoverflow, documentation and examples) you can reproduce what you need.

FFMPEG is the perfect tool for working with media files, it lends itself as a multi-functional tool offering almost everything (Media compression, Media file type conversion etc etc). Iv used FFMPEG personally to take media streams and prepare them for real time streaming and iv used this tool to compress files with huge data sizes to files with pretty small sizes (something like 800MB to 20MB) after rendering.

I have used it for video editing, after using other paid software, like premiere pro. It is true that you need to get used to it, as it uses coding language - but you can find anything you need to in online tutorials (I could learn it with no previous coding experience). I specially like that it does not occupy much space in laptop, it is a complete new way of video editing, and it is super neat. It easily allows you to change video formats, extract or add audio, change quality of videos...