Indeed it should support all commands. ffmpeg shouldn't even be relevant, that's just an implementation detail. If a command is missing, it should be installed.

Indeed it should support all commands. ffmpeg shouldn't even be relevant, that's just an implementation detail. If a command is missing, it should be installed. Just tell the computer what you want, and it figures out how to do it. Isn't that the dream? I think the logical conclusion here is replacing the shell with GPT. It might not be a good idea — yet — but it's certainly possible already.