Motion Consistency
How stable objects, characters, and physics stay across a video's frames — the difference between smooth footage and AI weirdness like flickering textures, morphing faces, or a coffee cup that changes shape mid-shot. It is the central quality metric of AI video models, and the main thing that improved between model generations. You can help it along: simpler scenes, fewer subjects, one clear camera movement, and shorter clips all boost consistency. When a generation morphs, do not just retry the same prompt — reduce the number of moving elements in it.