> ## Documentation Index > Fetch the complete documentation index at: https://apidoc.cometapi.com/llms.txt > Use this file to discover all available pages before exploring further. # 建立 Runway 圖像轉影片任務 > 使用 CometAPI 呼叫 Runway image_to_video，將靜態圖片 URL 轉換為原始影片輸出，並支援 X-Runway-Version 以確保相容性。 使用此端點可將一張來源圖片製作成 Runway 影片動畫。 ## 呼叫前須知 * 傳送必要的 `X-Runway-Version` 標頭，例如 `2024-11-06` * 使用 `model: gen3a_turbo` * 提供穩定的 HTTPS `promptImage` * 以 `duration: 5` 和所選 Runway model/version 支援的 ratio 值作為起點 ## Duration 與 ratio | 設定 | 支援的值 | 預設起始值 | 邊界行為 | | ------------------------------------------- | --------------------------------------------------------------------------------- | ------------------- | ---------------------------------------------------------- | | `duration` | 依 Runway model/version 而定；為了獲得最廣泛的相容性，請使用 `5` 或 `10` | `5` | CometAPI 會將該值轉送給 Runway。若所選 model/version 拒絕此值，請改用 `5` 重試。 | | 搭配 `X-Runway-Version: 2024-11-06` 的 `ratio` | 依 Runway model/version 而定的解析度樣式值，例如 `1280:768`、`768:1280`、`1280:720` 或 `720:1280` | `1280:768` | 在完成的媒體中，請求值可能會被正規化；在依賴精確像素前，請先檢查最終影片。 | | 搭配較舊相容版本的 `ratio` | `16:9`、`9:16`，或所選 model/version 接受的解析度樣式值 | `16:9` 或 `1280:768` | 在正式整合中，建議優先使用目前 Runway 的解析度樣式值。 | Runway 官方格式請求使用 `ratio`，而不是 `size`。請將解析度樣式的 ratio 值理解為其對應的 `WxH`：`1280:720` 代表目標 `1280x720`，`720:1280` 代表目標 `720x1280`，而 `1280:768` 仍可能依所選 model/version 轉譯為 `1280x720`。 ## 任務流程 使用來源圖片以及可選的簡短動作 Prompt 來建立任務。 將任務 `id` 儲存起來，以便稍後輪詢。 使用 [取得 Runway 任務](./runway-to-get-task-details)。如果第一次輪詢回傳 `task_not_exist`，請等待幾秒後再重試。 ## OpenAPI ````yaml api/openapi/video/runway/official-format/post-runway-images-raw-video.openapi.json POST /runwayml/v1/image_to_video openapi: 3.1.0 info: title: Image to Video API version: 1.0.0 description: >- Create a Runway image-to-video task through the official-format CometAPI route. servers: - url: https://api.cometapi.com security: - bearerAuth: [] paths: /runwayml/v1/image_to_video: post: summary: Create a Runway image-to-video task description: >- Submit a source image plus optional motion prompt and receive a task id for later polling. operationId: runway_images_raw_video parameters: - name: X-Runway-Version in: header required: true description: Runway version header, for example `2024-11-06`. schema: type: string requestBody: required: true content: application/json: schema: type: object required: - promptImage - model properties: promptImage: type: string description: Source image URL. default: >- https://cdn.britannica.com/70/234870-050-D4D024BB/Orange-colored-cat-yawns-displaying-teeth.jpg seed: type: integer description: 'Random seed for reproducible results. Range: 0–999999999.' model: type: string description: >- Runway image-to-video model ID. Choose an available model from the [Models page](/overview/models). default: gen3a_turbo promptText: type: string description: >- Text prompt describing the desired motion or scene. Maximum 512 characters. watermark: type: boolean description: Whether to add a watermark to the output video. default: false duration: type: integer description: >- Video duration in seconds. Runway support is model/version dependent; use 5 or 10 for the broadest compatibility. CometAPI forwards this value to Runway. default: 5 ratio: type: string description: >- Requested output ratio. Accepted values are Runway model/version dependent. With X-Runway-Version 2024-11-06, use a resolution-style value accepted by the selected model, such as 1280:768, 768:1280, 1280:720, or 720:1280. Read these as WxH targets, but completed media may normalize, so inspect the returned file before relying on exact pixels. default: '1280:768' default: promptImage: >- https://cdn.britannica.com/70/234870-050-D4D024BB/Orange-colored-cat-yawns-displaying-teeth.jpg seed: 1 model: gen3a_turbo promptText: A calm camera move. watermark: false duration: 5 ratio: '1280:768' examples: Default: summary: Default value: promptImage: >- https://cdn.britannica.com/70/234870-050-D4D024BB/Orange-colored-cat-yawns-displaying-teeth.jpg seed: 1 model: gen3a_turbo promptText: A calm camera move. watermark: false duration: 5 ratio: '1280:768' responses: '200': description: Task accepted. content: application/json: schema: type: object required: - id properties: id: type: string example: id: d0658ae1-bbdd-4adc-aaba-fd8070e14d79 x-codeSamples: - lang: Shell label: Default source: | curl https://api.cometapi.com/runwayml/v1/image_to_video \ -H "Authorization: Bearer $COMETAPI_KEY" \ -H "Content-Type: application/json" \ -d '{ "promptImage": "https://your-image-host/first-frame.png", "promptText": "A calm camera move.", "model": "gen3a_turbo", "ratio": "1280:768", "duration": 5 }' - lang: Python label: Default source: > import os import requests response = requests.post( "https://api.cometapi.com/runwayml/v1/image_to_video", headers={"Authorization": "Bearer " + os.environ["COMETAPI_KEY"]}, json={ "promptImage": "https://your-image-host/first-frame.png", "promptText": "A calm camera move.", "model": "gen3a_turbo", "ratio": "1280:768", "duration": 5 }, ) task = response.json() print(task["id"]) # poll GET /runwayml/v1/tasks/{id} until the output array appears - lang: JavaScript label: Default source: > const response = await fetch("https://api.cometapi.com/runwayml/v1/image_to_video", { method: "POST", headers: { Authorization: `Bearer ${process.env.COMETAPI_KEY}`, "Content-Type": "application/json", }, body: JSON.stringify({ "promptImage": "https://your-image-host/first-frame.png", "promptText": "A calm camera move.", "model": "gen3a_turbo", "ratio": "1280:768", "duration": 5 }), }); const task = await response.json(); console.log(task.id); // poll GET /runwayml/v1/tasks/{id} until the output array appears components: securitySchemes: bearerAuth: type: http scheme: bearer description: Bearer token authentication. Use your CometAPI key. ````