: Right-click the file, go to Properties (Windows) or Get Info (Mac), and look at the "Origin" or "Description" tags.
If you are trying to figure out what is in this specific video: 12379147-1440p.mp4
: Services like Cloudinary or Vimeo use similar IDs to store different resolution versions (like 1440p) of a single upload. : Right-click the file, go to Properties (Windows)