Video prompt: The sun casts long shadows as he glides effortlessly across the smooth concrete, his wheels humming with speed. He launches off a ramp, executing a flawless kickflip in mid-air, his board spinning beneath him. As he lands gracefully, a group of onlookers cheer and clap, their faces filled with admiration. He then transitions into a series of intricate tricks, weaving between obstacles with precision and agility. The sound of skateboards clattering and the distant chatter of the city create a lively backdrop. Nearby, a street artist captures the scene with quick strokes of spray paint, adding vibrant colors to the mural on the park's wall. The air is filled with the scent of fresh paint and the energy of youthful exuberance.
Defect: unsmooth motion ( motion is correct)
Explanation: The skateboard is falling down due to gravity, but the motion looks unsmooth and unrealistic. It seems too jittery/shaky, rather than uniform