Why the original music video is a natural fit for AI face-swapping
The "POPSTAR" music video's premise is already a face swap. The video opens with DJ Khaled pestering Drake over FaceTime to come and shoot the video. Drake, stuck at home, sends Justin Bieber instead. Bieber then spends the next eight minutes lip-syncing Drake's lyrics through a mansion party, with a bald, bearded security guard never leaving his side. At the end, Bieber wakes up next to Hailey Bieber, and it was all a dream. The joke is that the man on the song isn't the man in the clip. Swapping in yet another person extends that joke one step further. The AI version puts the user in Bieber's place, standing in for Bieber standing in for Drake. The "Lil [Name]" caption format, which Neymar started with "Lil Ney", gives the post a built-in caption and a built-in joke without having to explain anything. The bodyguard is the punchline: he's there for someone famous, and the comedy is in who he ends up guarding.
How AI video models handle the face replacement
The popstar ai video generator uses a reference-to-video model that accepts a character image and a video reference. The uploaded photo defines the new lead's face, hair, skin tone, body shape, outfit, and accessories. The reference video guides the movement, timing, framing, and camera motion. The model copies the reference performer's gestures, walking pace, expressions, and performance timing frame by frame. The mouth movements match the reference performer's mouth frame by frame: open, closed, stretched, and rounded on exactly the same frames. The bodyguard, other people, mansion setting, lighting, framing, and action order remain consistent from the reference. The model preserves the same identity throughout the clip, including turns and reappearance after foreground overlaps. The song audio is retained from the original clip. The result is a 12-second vertical video where the subject appears to perform the walk with natural movement and lip-sync, without the user needing to film anything themselves.