alt Hacker NewsI put your exact prompt into Copilot and it gave me the command
ffmpeg -i movie.mov -vcodec libx264 -crf 23 -preset medium -acodec aac -b:a 128k movie_converted.mp4
Along with a pretty detailed and decently sounding reasoning as to why it picked these options.
It's been increasingly more obvious people on hacker news literally do not run these supposed prompts through LLMs. I bet you could run that prompt 10 times and it would never give up without producing a (probably fine) sh command.
Read the replies. Many folks have called gpt-4.1 through copilot and get (seemingly) valid responses.