: Open the audio from the MP4 in a tool like Audacity . Switch to "Spectrogram" view to see if any images or text have been embedded into the sound frequencies.
Because these files are frequently part of larger "unfiction" projects, "guides" for them typically focus on decoding hidden metadata, audio frequencies, or visual frames. Common Elements in "NM18.mp4" Style Guides: NM18.mp4
: Look for frame-by-frame changes. ARGs often hide text or QR codes in single frames that are invisible at normal playback speeds. : Open the audio from the MP4 in a tool like Audacity
: Is the video mostly static or high-pitched noise? That is a primary indicator that the "guide" is hidden in the audio spectrogram. NM18.mp4