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121b357ba0
video_save passes [-1,1]-range pixels to rife.interpolate_nchw, but RIFE v4.25's IFNet explicitly clamps inputs to [0,1] (Head and IFNet forward pass), turning every negative pixel value into zero. v3.9 silently extrapolated and produced soft artifacts; v4.25 produces washout. Convert to [0,1] before the RIFE call and back to [-1,1] for downstream save.