If you have the link it came from, search for the folder ID (the 28821 part) on Google to find the original post.
If you don't recognize the source, run it through VirusTotal before playing it to ensure it is a safe media file.
Right-click the file and select Properties (Windows) or Get Info (Mac) to see the "Date Created" or "Origin." 28821-_1531966025.mp4
💡 Knowing the source app would help me track down the exact video.
The "1531966025" part of the name often corresponds to a Unix timestamp (this one translates to July 19, 2018 ), suggesting this is a clip from that date. If you have the link it came from,
The filename appears to be a specific identifier typically used by Reddit's video hosting service (v.redd.it) or similar social media content delivery networks .
If you found this on your device, it was likely saved by a third-party Reddit downloader or a browser cache. The "1531966025" part of the name often corresponds
If you have the file and want to know what it is without opening it: