aichat has shell integration scripts that allow you to write English into the command line and press Alt+E to have it replaced with a command: https://github.com/sigoden/aichat/tree/main/scripts/shell-in...

So you'd just type "use ffmpeg to convert 'my input.avi' to NTSC output and make the audio track quieter" => Alt+E => replaced with `ffmpeg -i "my input.avi" -target ntsc-dvd -af "volume=0.5" "output.mpg`