First of all, I love this. ffmpeg is the closest to magic, with the arguments the closest to Harry Potter-type spells, I've ever seen.

Second... I swear it makes me want something like this for shell commands in general. The amount of time I've wasted trying to fix nightmare quoting and spacing issues when passing arguments (containing spaces) that get to a command that will run ssh to run a command remotely that needs those original arguments...

I swear if there were a visual command-line builder that guaranteed quotes and spaces and variables were always printed and escaped correctly, together with a visual reminder of what the -akxlIEJC flags all mean... in other words, I want this but for way more than just ffmpeg! :)