Try VLC Media Player , which supports almost every format.
Never open mysterious .mp4 files directly on your primary OS if you suspect they may contain embedded exploits. 19801mp4
Take a screenshot of a unique frame and use Google Lens or TinEye to see if the footage has appeared elsewhere. Try VLC Media Player , which supports almost every format
Filenames like "19801" are often placeholders. The real info is in the metadata. Try VLC Media Player