Pictured: first column: Video frames taken from YouTube and fake videos generated from Sora by OpenAI; second column: frames reconstructed by diffusion; third column: the differences between the first and the second columns. As illustrated, the real-world video frames differ more from their diffusion-reconstructed frames than diffusion-generated video, a key insight for DIVID to detect diffusion-generated video. DIRE (DIffusion Reconstruction Error) is a method that measures the difference between an input image and the corresponding output image reconstructed by a pretrained diffusion model.