Extracted input parameters from video-model-api-doc.md for each platform: - Vidu: T2V, I2V, 2I2V, Ref2V (v1/v2 subject/non-subject modes) - Seedance: T2V, TI2V, Ref2V - Tongyi/DashScope: T2V, I2V, 2I2V, Ref2V, IA2V - Kling: T2V - Hailuo/MiniMax: TI2V - HappyHorse: T2V, I2V, Ref2V