How we built a hybrid reels pipeline: a real expert plus AI B-roll

The expert films the talking-head himself; the cutaways between his points are AI-generated — faceless video under synthesized speech. The story of how a one-off script grew into a five-stage pipeline, with the gotchas: hypnotic loops, ‘free’ voices that answer 402, and a Seedance that refuses to shoot 3 seconds.

The brief sounded deceptively simple: short vertical clips where a real-estate expert talks to camera, and between his points sit clean AI cutaways — construction sites, transit, a document in close-up, a phone in hand. The face is filmed by a human; the atmosphere is generated by a neural net. What started as a one-off generation script grew into a five-stage pipeline, and along the way we collected nearly every gotcha this kind of build has to offer.

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