Why Locking the Seed Still Won't Get You the Same AI Video Shot Twice

A seed in AI video generation is a starting number for the model’s noise pattern, and locking it only reproduces a result when the model version, sampler, and hardware behind it also stay the same, which they rarely do.

I ran the exact same prompt, the exact same seed, on the exact same shot from Lost Garden twice, four days apart. Same camera direction, same character reference, same everything I could control. The second version came back with a slightly different jaw line and a camera drift the first one didn’t have. Nothing in my settings had changed. The model behind the tool had.

What a seed actually controls

A seed is not a save file. It is the numerical starting point for the random noise a diffusion model gradually shapes into your image or clip. Runway’s own explainer on the mechanic is blunt about the limits: seeds control “initial...

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