Seedance 2.5 视频生成 API

curl -X POST "https://api.looprouter.com/api/v3/contents/generations/tasks" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $LOOPROUTER_API_KEY" \
  -d '{
    "model": "doubao-seedance-2-5-260628",
    "content": [
      {
        "type": "text",
        "text": "雨后的城市街道，霓虹灯倒映在积水中，一只橘猫从画面左侧慢慢走过"
      }
    ],
    "resolution": "720p",
    "ratio": "16:9",
    "duration": 10
  }'

# 返回：{"id": "task_xxxx"} —— 只返回任务 ID，视频需轮询查询接口获取

import time
import requests

BASE = "https://api.looprouter.com"
HEADERS = {
    "Authorization": "Bearer sk-你的APIKey",
    "Accept-Encoding": "identity",  # 避免个别环境 gzip 解码异常
}

# 1. 创建任务
resp = requests.post(
    f"{BASE}/api/v3/contents/generations/tasks",
    headers=HEADERS,
    json={
        "model": "doubao-seedance-2-5-260628",
        "content": [
            {"type": "text", "text": "雨后的城市街道，霓虹灯倒映在积水中，一只橘猫从画面左侧慢慢走过"}
        ],
        "resolution": "720p",
        "ratio": "16:9",
        "duration": 10,          # 2.5 支持 4~30 秒
        "output_format": "mp4",  # 可改为 mov，用于专业后期
        # "generate_audio": True,  # 默认开启同步音频
    },
)
resp.raise_for_status()
task_id = resp.json()["id"]
print("任务已创建:", task_id)

# 2. 轮询任务状态（建议 15~30 秒一次；长时长任务可适当延长）
while True:
    task = requests.get(
        f"{BASE}/api/v3/contents/generations/tasks/{task_id}",
        headers=HEADERS,
    ).json()
    status = task["status"]
    print("当前状态:", status)
    if status in ("succeeded", "failed", "cancelled", "expired"):
        break
    time.sleep(20)

# 3. 下载成片（下载时不要携带 Authorization 头）
if status == "succeeded":
    video_url = task["content"]["video_url"]
    output_format = task.get("output_format", "mp4")
    filename = f"output.{output_format}"
    with requests.get(video_url, stream=True) as r:
        r.raise_for_status()
        with open(filename, "wb") as f:
            for chunk in r.iter_content(chunk_size=1 << 20):
                f.write(chunk)
    print("已保存", filename)
else:
    print("任务未成功:", task.get("error"))

# 模式二：首尾帧图生视频 —— 用两张图约束视频的第一帧和最后一帧
first_last_frame_body = {
    "model": "doubao-seedance-2-5-260628",
    "content": [
        {"type": "text", "text": "镜头缓缓推进，人物转身微笑"},
        {"type": "image_url", "image_url": {"url": "https://example.com/first.jpg"}, "role": "first_frame"},
        {"type": "image_url", "image_url": {"url": "https://example.com/last.jpg"}, "role": "last_frame"},
    ],
    "resolution": "720p",
    "ratio": "adaptive",  # 2.5 首帧 / 首尾帧任务仅支持 adaptive
    "duration": 8,
}

# 模式三：多模态参考 —— 参考图 / 参考视频 / 参考音频自由组合
multimodal_body = {
    "model": "doubao-seedance-2-5-260628",
    "omni_reference_task_type": "reference",
    "content": [
        {"type": "text", "text": "根据图片1中的角色生成一段在草地上奔跑的新视频"},
        {"type": "image_url", "image_url": {"url": "asset://asset-20260709190143-ntwhb"}, "role": "reference_image"},
        # {"type": "video_url", "video_url": {"url": "https://example.com/ref.mp4"}, "role": "reference_video"},
        # {"type": "audio_url", "audio_url": {"url": "https://example.com/voice.mp3"}, "role": "reference_audio"},
    ],
    "resolution": "720p",
    "ratio": "adaptive",
    "duration": -1,  # -1 表示由模型自行决定时长，按实际产出计费
}

const BASE = "https://api.looprouter.com";
const KEY = process.env.LOOPROUTER_API_KEY;

async function main() {
  // 创建任务
  const createRes = await fetch(`${BASE}/api/v3/contents/generations/tasks`, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      Authorization: `Bearer ${KEY}`,
    },
    body: JSON.stringify({
      model: "doubao-seedance-2-5-260628",
      content: [
        { type: "text", text: "雨后的城市街道，霓虹灯倒映在积水中，一只橘猫从画面左侧慢慢走过" },
      ],
      resolution: "720p",
      ratio: "16:9",
      duration: 10,
    }),
  });
  const { id } = await createRes.json();
  console.log("任务已创建:", id);

  // 轮询
  for (;;) {
    await new Promise((r) => setTimeout(r, 20000));
    const task = await (
      await fetch(`${BASE}/api/v3/contents/generations/tasks/${id}`, {
        headers: { Authorization: `Bearer ${KEY}` },
      })
    ).json();
    console.log("当前状态:", task.status);
    if (["succeeded", "failed", "cancelled", "expired"].includes(task.status)) {
      if (task.status === "succeeded") console.log("视频地址:", task.content.video_url);
      else console.error("任务未成功:", task.error);
      break;
    }
  }
}

main();

curl "https://api.looprouter.com/api/v3/contents/generations/tasks/task_xxxx" \
  -H "Authorization: Bearer $LOOPROUTER_API_KEY"