This is very nice. When I use ffmpeg recently I usually ask an LLM first but it often takes a few tries to get the exact incantation right.

On a side note (I’m not a web developer), why would a command line tool like this be written and distributed using node.js? Seems like an unnecessary risk to use JavaScript for a basic (local) command line tool. Couldn’t this be written more simply in like Rust or something?