Many CCTV and dashcam systems use alphanumeric prefixes (like 'g') followed by a sequence number.
Brands like GoPro or various car dashcams often use similar naming conventions for saved video clips. g7098.mp4
Filename patterns like "g[digits].mp4" are typically generated automatically by digital cameras, security systems, or internal databases. Because this name is generic, it could refer to a variety of things depending on where you encountered it: Many CCTV and dashcam systems use alphanumeric prefixes