FFmpeg is a command line app, that's why you need a GUI (Graphical User Interface).
There are a few GUIs listed under Video Encoders
- and some applications that uses ffmpeg: exhale
In order to find out how to handle FFmpeg, check also these guides:
- How do I install and use ffmpeg on Windows?
- How do I use rav1e and FFmpeg to create high quality video files?
We're listing here the latest builds of ffmpeg, compiled by different authors.