> ## Documentation Index
> Fetch the complete documentation index at: https://docs.comfy.org/llms.txt
> Use this file to discover all available pages before exploring further.

# 使用 Videos Video Extend 搭配 Comfy Router

> 通过 Comfy Router 调用 kling/videos-video-extend：endpoint、请求形状以及 Router 返回的响应。

`kling/videos-video-extend` 的 API 参考，由 Comfy Router 提供，来源于 Kling。

## 快速开始

在[你的 Comfy 工作区](https://platform.comfy.org/profile/api-keys)中创建一个密钥，并将其导出为 `COMFY_API_KEY`。Python 和 TypeScript 代码片段使用 Comfy SDK（`pip install comfy-sdk`、`npm install @comfyorg/sdk`）；cURL 代码片段是通过原始 HTTP 执行的同一调用。

**模型 ID：** `kling/videos-video-extend`

**端点：** `POST https://api.comfy.org/v2/models/kling/videos-video-extend`

<Tabs>
  <Tab title="Wait for the result">
    <CodeGroup>
      ```python Python theme={null}
      from comfy_sdk import Comfy

      # Reads COMFY_API_KEY from the environment.
      # The SDK automatically creates an idempotency key and reuses it for automatic retries.
      with Comfy() as client:
          result = client.models.run(
              "kling/videos-video-extend",
              {
                  "cfg_scale": 0.5,
                  "prompt": "The camera keeps drifting forward down the alley.",
                  "video_id": "kling-video-6f5e4d3c2b1a",
              },
          )

      print(result)
      ```

      ```typescript TypeScript theme={null}
      import { comfy } from "@comfyorg/sdk";

      // Reads COMFY_API_KEY from the environment.
      // The SDK automatically creates an idempotency key and reuses it for automatic retries.
      const { data } = await comfy.models.run("kling/videos-video-extend", {
        cfg_scale: 0.5,
        prompt: "The camera keeps drifting forward down the alley.",
        video_id: "kling-video-6f5e4d3c2b1a",
      });

      console.log(data);
      ```

      ```bash cURL theme={null}
      curl https://api.comfy.org/v2/models/kling/videos-video-extend \
        -H "X-API-Key: $COMFY_API_KEY" \
        -H "Idempotency-Key: $(uuidgen)" \
        -H "Content-Type: application/json" \
        -d "{\"cfg_scale\": 0.5, \"prompt\": \"The camera keeps drifting forward down the alley.\", \"video_id\": \"kling-video-6f5e4d3c2b1a\"}"
      ```
    </CodeGroup>
  </Tab>

  <Tab title="Queue and collect later">
    <CodeGroup>
      ```python Python theme={null}
      from comfy_sdk import Comfy

      # Reads COMFY_API_KEY from the environment.
      # Each submit() call mints its own Idempotency-Key and reuses it for automatic retries.
      with Comfy() as client:
          handle = client.models.submit(
              "kling/videos-video-extend",
              {
                  "cfg_scale": 0.5,
                  "prompt": "The camera keeps drifting forward down the alley.",
                  "video_id": "kling-video-6f5e4d3c2b1a",
              },
          )
          print("request_id:", handle.request_id)  # with the model ID, all another process needs

          # Poll until the request completes, waiting the Retry-After the server names.
          for update in handle.iter_events():
              print(update.status, update.queue_position)

          # The provider's own payload, the same value models.run() returns.
          # A request that failed or was cancelled raises the typed Router error here.
          result = handle.get()

      print(result)
      ```

      ```typescript TypeScript theme={null}
      import { comfy } from "@comfyorg/sdk";

      // Reads COMFY_API_KEY from the environment.
      // Each submit() call mints its own Idempotency-Key and reuses it for automatic retries.
      const handle = await comfy.models.submit("kling/videos-video-extend", {
        cfg_scale: 0.5,
        prompt: "The camera keeps drifting forward down the alley.",
        video_id: "kling-video-6f5e4d3c2b1a",
      });
      console.log("requestId:", handle.requestId); // with the model ID, all another process needs

      // Poll until the request completes, waiting the Retry-After the server names.
      for await (const update of handle.events()) {
        console.log(update.status, update.queuePosition);
      }

      // The same result models.run() returns. A request that failed or was cancelled rejects here.
      const result = await handle.get();

      console.log(result.data);
      ```

      ```bash cURL theme={null}
      # 1. Submit. Router answers 201 with request_id, status_url, response_url and cancel_url.
      curl https://api.comfy.org/v2/models/kling/videos-video-extend/requests \
        -H "X-API-Key: $COMFY_API_KEY" \
        -H "Idempotency-Key: $(uuidgen)" \
        -H "Content-Type: application/json" \
        -d "{\"cfg_scale\": 0.5, \"prompt\": \"The camera keeps drifting forward down the alley.\", \"video_id\": \"kling-video-6f5e4d3c2b1a\"}"

      # 2. Poll until status is COMPLETED, waiting the Retry-After seconds each response names.
      REQUEST_ID="<request_id from the 201 body>"
      curl -i https://api.comfy.org/v2/models/kling/videos-video-extend/requests/$REQUEST_ID/status \
        -H "X-API-Key: $COMFY_API_KEY"

      # 3. Collect. 200 with the model's native output, 202 with the status body while it is still running.
      curl https://api.comfy.org/v2/models/kling/videos-video-extend/requests/$REQUEST_ID \
        -H "X-API-Key: $COMFY_API_KEY"
      ```
    </CodeGroup>
  </Tab>
</Tabs>

## 数据结构

### 输入

<ParamField body="callback_url" type="string (uri)">
  回调通知地址。任务状态发生变化时，服务器将发送通知。

  Format: `uri`
</ParamField>

<ParamField body="cfg_scale" type="number" default="0.5">
  视频生成的灵活度。该值越高，模型的灵活度越低，与用户提示词的相关性越强。

  Range: `0` to `1`

  Format: `float`
</ParamField>

<ParamField body="negative_prompt" type="string">
  负面文本提示词，用于指定扩展视频中需要避免的元素
</ParamField>

<ParamField body="prompt" type="string">
  正向文本提示词，用于引导视频扩展
</ParamField>

<ParamField body="video_id" type="string" required>
  要扩展的视频 ID。支持文生视频、图生视频以及此前的视频扩展操作生成的视频。扩展后的总时长不能超过 3 分钟。
</ParamField>

根据 Router 在 `GET /v2/models/kling/videos-video-extend/openapi.json` 提供的 schema 生成，该文档与请求到达提供商之前用于校验调用的文档相同。

### 输出

<ResponseField name="code" type="integer">
  错误码
</ResponseField>

<ResponseField name="data" type="object" />

<ResponseField name="data.created_at" type="integer">
  任务创建时间，Unix 时间戳（毫秒）
</ResponseField>

<ResponseField name="data.final_unit_deduction" type="string">
  任务的扣费单位数
</ResponseField>

<ResponseField name="data.task_id" type="string">
  任务 ID
</ResponseField>

<ResponseField name="data.task_info" type="object" />

<ResponseField name="data.task_info.external_task_id" type="string" />

<ResponseField name="data.task_result" type="object" />

<ResponseField name="data.task_result.videos" type="object[]" />

<ResponseField name="data.task_result.videos[].duration" type="string">
  视频总时长，单位为秒
</ResponseField>

<ResponseField name="data.task_result.videos[].id" type="string">
  已生成的视频 ID
</ResponseField>

<ResponseField name="data.task_result.videos[].url" type="string (uri)">
  已生成视频的 URL

  Format: `uri`
</ResponseField>

<ResponseField name="data.task_result.videos[].watermark_url" type="string (uri)">
  已生成视频的带水印 URL，防盗链格式

  Format: `uri`
</ResponseField>

<ResponseField name="data.task_status" type="string">
  任务状态

  可能的值：`submitted`、`processing`、`succeed`、`failed`
</ResponseField>

<ResponseField name="data.updated_at" type="integer">
  任务更新时间，Unix 时间戳（毫秒）
</ResponseField>

<ResponseField name="message" type="string">
  报错信息
</ResponseField>

<ResponseField name="request_id" type="string">
  请求 ID
</ResponseField>

## 示例

### 输入

```json theme={null}
{
  "cfg_scale": 0.5,
  "prompt": "The camera keeps drifting forward down the alley.",
  "video_id": "kling-video-6f5e4d3c2b1a"
}
```

### 输出

```json theme={null}
{
  "code": 0,
  "data": {
    "created_at": 1798761600000,
    "task_id": "kling-video-extend-task-0a1b2c3d4e5f",
    "task_result": {
      "videos": [
        {
          "duration": "10",
          "id": "kling-video-5f4e3d2c1b0a",
          "url": "https://example.invalid/kling/videos-video-extend/generated.mp4"
        }
      ]
    },
    "task_status": "succeed",
    "updated_at": 1798762020000
  },
  "message": "SUCCEED",
  "request_id": "c7b6a504-3f2e-41d0-8a9c-6b5d4e3f2a10"
}
```

## 发布前须知

SDK 会生成 `Idempotency-Key` 并在自动重试中复用它。手动重试时，请复用原始 key。Router 最长可保持连接 10 分钟。

请求失败时，Router 会发送 `X-Comfy-Error-Type` 响应头说明原因。`422` 表示 Router 在调用提供商之前就拒绝了输入。生成的资源请及时下载，因为[结果链接会过期](/zh/development/comfy-router/reference#结果资产)。

<CardGroup cols={3}>
  <Card title="请求头" icon="list" href="/zh/development/comfy-router/quickstart">
    身份验证、幂等性、请求 ID、错误分类、重试节奏、消费限额。
  </Card>

  <Card title="使用 Router API" icon="code" href="/zh/development/comfy-router/quickstart">
    模型发现、校验错误、重试与计费。
  </Card>

  <Card title="限制" icon="triangle-exclamation" href="/zh/development/comfy-router/limitations">
    Router 目前不支持的功能，以及替代方案。
  </Card>
</CardGroup>