The filename is a machine-generated string typically created by content delivery networks (CDNs) or automated video processing systems like those used by Reddit, Discord, or Twitter (X) .
When a user uploads a video to a social platform, the site's backend assigns a unique alphanumeric ID (like 0h147u... ) to track the raw file in their database.
These specific filenames often appear when a user downloads a video using a browser extension or a third-party downloader . Because the original uploader didn't give the file a "real" name (like "Vacation.mp4"), your computer saves it using the cryptic internal ID assigned by the server.