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:
Without more context, such as where the file was found or its file size, it is likely a from a digital device rather than a recognizable internet video. g4_0123.mp4
Brands like Garmin or VIOFO often use alphanumeric strings to categorize locked or continuous recording files. g4_0123.mp4