ffmpeg -i "Young.Sheldon.S02E20.ts" \ -c:v libx264 -preset veryslow -tune film -crf 18 \ -c:a aac -b:a 192k \ -movflags +faststart \ "Young.Sheldon.S02E20.1080p.HDTV.AAC.mp4"

This appears to be a mix of a and a software command .

Since you wrote ffmpeg after the episode name, you might be trying to of this episode.