One of the best uses of LLMs is to help find the right command line options for tools like ffmpeg.

It won't always give you a perfect answer the first time, but it's much better than memorizing the manual or interpreting a forum discussion. Haven't used it for ffmpeg, but lots of other command lines.

I find it helps if you paste in the the ffmpeg manual and get the ai to use that as source. Helps it stick to real params.

Because ffmpeg is built on the Unix chained utility philosophy I find ai is also good at building scripts the use it as well