: Scrub through the video frame-by-frame. Creators often hide a single frame with a face, a map, or a QR code. 3. Audio Spectrograms Many "mysterious" mp4 files hide secrets in the audio.
: Look for latitude/longitude numbers flashed briefly on the screen. video4927.mp4
If you have the actual file, you can check its metadata (the "data about the data"): : Scrub through the video frame-by-frame
Watch for specific "glitch" tropes that are common in these videos: video4927.mp4
If you are stuck, these communities are dedicated to solving these exact types of videos: