"9684.mp4" could be a security camera clip, a private video upload, or a stock footage asset. A typo for a hardware model:
Could you please provide a bit about what this item is or where you saw the name? 9684mp4
"9684" is sometimes used to denote large commercial dimensions (like a 96" x 84" sliding door), but this does not correlate with an "mp4" extension. a private video upload