: Use a player like VLC and press e to advance frame-by-frame. Look for "subliminal" flashes of text or QR codes.
: Open the audio in Audacity and switch to "Spectrogram" view. Creators often hide images or text in the sound frequencies. 1,2,3...04.mp4
Before interacting with the file, ensure it is what it claims to be: : Use a player like VLC and press