G4_0123.mp4 -

Instead, file names following this specific pattern—a letter followed by a number, an underscore, and then a sequence of digits—are commonly associated with:

Many DVR and NVR systems (such as those from Lorex, Swann, or Hikvision) auto-save clips using "g" (for group/channel) or "ch" prefixes followed by timestamps or sequence numbers. g4_0123.mp4

In computer science and AI research (such as the UCF101 or Kinetics datasets), video files are often renamed to short codes like "g01_v01.mp4" for easier processing. g4_0123.mp4

Brands like Garmin or VIOFO often use alphanumeric strings to categorize locked or continuous recording files. g4_0123.mp4

DJI and GoPro cameras generate sequential filenames that vary slightly by model but often look like "G0010123.mp4."