Video prompt: The wind tousles their hair, and the sunlight dances on their sunglasses. Nearby, a vibrant red sailboat with its sails billowing in the gentle breeze cuts through the water, its crew skillfully adjusting the ropes. In the distance, a family on a pontoon boat waves enthusiastically, their golden retriever barking excitedly at the passing seagulls. The water sparkles under the clear blue sky, and the sound of laughter and the hum of boat engines fill the air, creating a lively and joyful atmosphere.
Defect: unsmooth motion ( motion is correct)