Almost all encoder and decoder supports with great documentation.

Ffmpeg commands can be simple for some tasks. All in one - great capabilities. Logs enabled. media solution. Can make a business. Documentation. I like some key functionities like: Encoding with whatever configs. Used for preparing an adaptive VOD and live streaming solutions.

The most helpful has to be diversity and ways it can be useful in so many cases. Ive been working in encoding sector for a while, and even with access to insanely priced tools/software, there are only few features that aren't accessable with FFMPEG.