Detecting deepfake video

A deepfake video shows a real, specific person appearing to do or say something they did not. These are the fakes that feel most alarming, because video used to be strong evidence. The good news is that the same context-first habit from images works even better on video, because a real video of a newsworthy event almost never exists in isolation.

Lead with source and corroboration, again:

• Who published it and where did it originate? A clip of a public figure saying something explosive, appearing first on an obscure account and nowhere credible, is a strong candidate for a fake.
• Is it corroborated? If a well-known person really said something dramatic, it will appear on their own verified channels and be reported by multiple established outlets. A clip that exists only as one re-shared file is suspicious by that fact alone.
• Is it cropped or stripped of context? Many misleading videos are not deepfakes at all — they are real clips edited to cut the context, or slowed down or sped up. Look for the full, original version.

Then look and listen for the tells that still work (and know they are hints, not proof):

• Lip sync and speech. Watch the mouth against the audio. Generated speech often shows lips that are slightly off, too smooth, or mismatched to the sounds being made. This is one of the more revealing areas to examine.
• The edges of the face and where it meets hair, glasses, ears, and neck. Flicker, blur, or a subtle mask-like boundary can appear here, especially when the head turns.
• Micro-behavior and physics. The tiny unconscious things — natural blinking rhythm, small head movements, how hands interact with objects, how light plays across skin — are computationally hard and still trip up many fakes. Blinking that is absent, too regular, or strange remains a useful signal.

Be honest about the moving target. Old advice like check the teeth or look for unnatural lighting worked when deepfakes were crude, and the best current video generators have largely solved those. So no single visual tell is dependable, and their absence never proves a video is real. The durable skills are the same as everywhere in this course: check the source, look for corroboration, and trace the clip to its origin.

Recap. For a surprising video of a real person, start with source and corroboration — genuine newsworthy footage appears on verified channels and across multiple credible outlets, and much misleading video is really just real clips edited to remove context. As a secondary check, watch lip sync, the flickering edges of the face, and unnatural micro-behavior like blinking, but treat these as hints because the best generators keep fixing the obvious tells. When in doubt, corroboration and tracing the clip to its origin beat any single visual giveaway.