This cryptic string can be broken into four distinct components, each a specific instruction for your media workflow:

Let’s assume your actual file is named nsfs324engsub.mkv , duration exactly 02:00:52 , with embedded English subtitles (ASS format). You want an MP4 file playable on any device, with subtitles optionally burned in, using quality (CRF 18).

(Command-line, most powerful)