Occasionally, cryptic file names are used in "Alternate Reality Games" (ARGs) or "creepypasta" stories to make a video feel like "found footage" or a leaked file.
GoPro cameras often use specific naming conventions (like GH010111.mp4 or GX010111.mp4 ). A file named g4_0111.mp4 might be a clip from a or a similar action camera.
To help you get the text you need, here are the most likely ways this file name is used: 1. GoPro or Action Camera Footage
Many security systems and dashcams save files using a "Group/Channel + Number" format.