interesting approach, i solved similar problem by creating visual tool to generate ffmpeg commands but its not the same(it cant do conversion etc.)

I like that you took no AI approach, i am looking for something like this i.e. understanding intent and generating command without using AI but so far regex based approaches have proved to be inadequate. I also tried indexing keywords and creating index of keywords with similar meaning that improved the situation a bit but without something heavy like bert its always a subpar experience.