Adaptive ratio
Adaptive ratio is an aspect-ratio option in which the output frame follows the reference material instead of a fixed shape. It avoids forcing a crop when your reference is unusual. The trade-off is that you do not fully control the final frame size, so choose a fixed ratio when the delivery format is strict.
Related: Aspect ratio · Reference image · Video-to-video
On Genvizu: /model/seedance-2-5