{
  "model": "doubao-seedance-2-0-260128",
  "content": [
    {
      "type": "text",
      "text": "保持商品外观、颜色、形状与数量，镜头缓慢推进，不新增文字，不切换场景。"
    },
    {
      "type": "image_url",
      "image_url": {
        "url": "https://YOUR-PUBLIC-IMAGE-HOST/product.png"
      },
      "role": "first_frame"
    }
  ],
  "ratio": "1:1",
  "duration": 4,
  "resolution": "720p",
  "generate_audio": false
}