If you are referring to a specific video you saw on a social media platform like TikTok or a creepypasta forum, it is likely a designed to mimic the aesthetic of lost media or "cursed" videos. These are frequently renamed with technical-sounding strings (like G404) to make them appear like leaked or system-internal files. 2024 Gabriel Awards Program - Novi AMS
In materials science, "g=404" is a specific acceleration value used in experiments regarding interfacial instabilities in liquid films, though this refers to a physical constant rather than a standalone video file. g404.mp4
In professional media contexts, "G404" is a category code for the Gabriel Awards , specifically used for Documentary Series submissions. Entrants are instructed to upload their entries as .mp4 files using this code. If you are referring to a specific video