Keyframe

Physical robots have constraints such as joint limits, speed limits, and inertia, so mapping virtual keyframes to a real machine often requires kinematic validation and trajectory adjustment.

In Kling 4.0, the more keyframes there are, the stronger the narrative controllability, but the higher the upfront design cost.

Keyframes are the core concept in motion design for defining animation states, referring to property values explicitly recorded at specific moments on the timeline (such as position, opacity, scale, rotation), and animation software automatically interpolates between adjacent keyframes to generate smooth transitions.

First generating and reviewing key frames for each scene using text-to-image, then driving I2V generation of dynamic clips from those key frames, decomposes the cross-shot consistency problem into a more manageable per-frame inspection process.