Looks Real Until It Moves: 7 Fixes for AI Video Physics Bugs

Kling 4.0 should be evaluated for physics and motion reliability through practical acceptance testing rather than assumed to have solved common AI video errors, as official claims and early user reports do not constitute independent benchmarks. The guidance defines physics bugs as continuity failures involving trajectory, contact, shape, materials, occlusion, or identity, and recommends reviewing clips frame by frame through setup, contact, and recovery rather than judging isolated attractive frames. It proposes four repeatable eight-second tests involving a skateboard jump, water pour, dancer’s turn, and meshed gears to examine grounding, collision, liquid volume, body and cloth continuity, and mechanical motion. To reduce deformation, creators should simplify competing actions, stabilize camera movement and object identity, use one clear action chain and camera path, and split complex shots when exact product shape, hand interactions, large turns, multiple occlusions, or liquid collisions are essential. The material also stresses retaining consistent test settings when comparing models, verifying live availability and pricing before production decisions, and reporting only observed results from the specific generation mode and configuration used.

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