VideoGenerationContentItem

{
    "type": "text",
    "text": "延续原视频中的公路旅行场景。",
    "image_url": "http://example.com",
    "video_url": "http://example.com",
    "video": "http://example.com",
    "audio_url": "http://example.com",
    "draft_task": "string",
    "role": "reference_image"
}