I remember seeing "sshn_mp4" linked in a thread years ago; it’s one of those videos that relies more on the mystery of where it came from than what's actually in it.
Based on available information, appears to be a specific digital file or video that has gained niche attention, often associated with "creepy" or "cursed" internet media. Because it is not a widely recognized commercial product or software, a review focuses on its impact as a piece of digital media. Overview of "sshn_mp4" sshn_mp4
: Heavy use of ambient noise, high-pitched frequencies, or reversed audio tracks, which are common tropes in "creepy" internet subcultures. I remember seeing "sshn_mp4" linked in a thread