: These are MP4 files specifically encoded with metadata that exploits how a media player (like Discord's built-in player) calculates video duration or resolution. When a user tries to play the file, it can cause the application to freeze or crash.
If you have encountered this file, here is what you need to know about the format: KM0cudE.mp4
Knowing the source (e.g., a specific Discord server or a website) would help narrow down exactly what the video contains. MP4 files explained: How to open and use - Adobe : These are MP4 files specifically encoded with