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Studio demos make every talking-head API look like magic. We ran five of them through real US creator footage — regional accents, kitchen lighting, compressed webcam video — and scored sync, artifacts, latency, and cost. Here is the decision matrix we would actually use.
The same prompt can produce a different video three weeks later because the model, safety layer, codec, or default settings moved under your feet. Treat generative media like a dependency: log the run, hash the output, and regression-test the weird stuff.
We handed the same neo-noir short-film brief to ten generative video engines, capped the spend, and scored the outputs on consistency, camera control, audio, latency, cost, and licensing. Here is the prompt pack, the scoreboard, and the workflow guide we would actually use.