> ## Documentation Index > Fetch the complete documentation index at: https://docs.evolink.ai/llms.txt > Use this file to discover all available pages before exploring further. # Wan2.7 Image to Video > - WAN2.7 (wan2.7-image-to-video) model supports image-to-video generation with multimodal inputs (image / audio / video) - Choose one of three generation modes via the `generation_mode` parameter: - `first_frame`: **First-frame to video** — generate a video starting from the given first frame, optional driving audio - `first_last_frame`: **First-and-last-frame to video** — generate a video by interpolating between the first and last frames, optional driving audio - `video_continuation`: **Video continuation** — continue an input video clip; an optional ending frame is allowed (no driving audio) - `generation_mode` is optional (backward compatible); if omitted, an appropriate mode will be selected automatically based on the materials in the request - Valid material combinations (any other combination will be rejected): 1. `image_start` (first frame) 2. `image_start` + `audio_urls` (first frame + driving audio) 3. `image_start` + `image_end` (first + last frame) 4. `image_start` + `image_end` + `audio_urls` (first + last frame + driving audio) 5. `video_urls` (video continuation) 6. `video_urls` + `image_end` (video continuation + last frame) - Asynchronous processing mode, use the returned task ID to [query status](/en/api-manual/task-management/get-task-detail) - Generated video links are valid for 24 hours, please save them promptly ## OpenAPI ````yaml /en/api-manual/video-series/wan2.7/wan2.7-image-to-video.json POST /v1/videos/generations openapi: 3.1.0 info: title: wan2.7-image-to-video API description: >- Generate videos from images using the WAN2.7 model. Supports first-frame / last-frame images, video continuation clips, and audio-driven generation license: name: MIT version: 1.0.0 servers: - url: https://api.evolink.ai description: Production Environment security: - bearerAuth: [] paths: /v1/videos/generations: post: tags: - Video Generation summary: wan2.7-image-to-video API description: >- - WAN2.7 (wan2.7-image-to-video) model supports image-to-video generation with multimodal inputs (image / audio / video) - Choose one of three generation modes via the `generation_mode` parameter: - `first_frame`: **First-frame to video** — generate a video starting from the given first frame, optional driving audio - `first_last_frame`: **First-and-last-frame to video** — generate a video by interpolating between the first and last frames, optional driving audio - `video_continuation`: **Video continuation** — continue an input video clip; an optional ending frame is allowed (no driving audio) - `generation_mode` is optional (backward compatible); if omitted, an appropriate mode will be selected automatically based on the materials in the request - Valid material combinations (any other combination will be rejected): 1. `image_start` (first frame) 2. `image_start` + `audio_urls` (first frame + driving audio) 3. `image_start` + `image_end` (first + last frame) 4. `image_start` + `image_end` + `audio_urls` (first + last frame + driving audio) 5. `video_urls` (video continuation) 6. `video_urls` + `image_end` (video continuation + last frame) - Asynchronous processing mode, use the returned task ID to [query status](/en/api-manual/task-management/get-task-detail) - Generated video links are valid for 24 hours, please save them promptly operationId: createWan27ImageToVideoGeneration requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/Wan27ImageToVideoRequest' examples: first_frame: summary: First-frame to video value: model: wan2.7-image-to-video generation_mode: first_frame prompt: A cat playing piano image_start: https://example.com/first_frame.jpg first_frame_with_audio: summary: First frame + driving audio value: model: wan2.7-image-to-video generation_mode: first_frame prompt: A young man performing an English rap image_start: https://example.com/first_frame.jpg audio_urls: - https://example.com/rap.mp3 first_last_frame: summary: First-and-last-frame to video value: model: wan2.7-image-to-video generation_mode: first_last_frame prompt: Camera gradually rises from eye level to a top-down view image_start: https://example.com/first_frame.png image_end: https://example.com/last_frame.png video_continuation: summary: Video continuation value: model: wan2.7-image-to-video generation_mode: video_continuation prompt: >- A girl takes a selfie in front of a mirror, then leaves home with her backpack video_urls: - https://example.com/clip.mp4 responses: '200': description: Video task created successfully content: application/json: schema: $ref: '#/components/schemas/VideoGenerationResponse' '400': description: Invalid request parameters content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: invalid_request message: Invalid request parameters type: invalid_request_error '401': description: Unauthenticated, invalid or expired token content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: unauthorized message: Invalid or expired token type: authentication_error '402': description: Insufficient quota, top-up required content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: insufficient_quota message: Insufficient quota. Please top up your account. type: insufficient_quota '403': description: No access permission content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: model_access_denied message: 'Token does not have access to model: wan2.7-image-to-video' type: invalid_request_error '429': description: Rate limit exceeded content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: rate_limit_exceeded message: Too many requests, please try again later type: rate_limit_error '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: internal_error message: Internal server error type: api_error components: schemas: Wan27ImageToVideoRequest: required: - model type: object properties: model: type: string description: Model name, must be `wan2.7-image-to-video` enum: - wan2.7-image-to-video example: wan2.7-image-to-video generation_mode: type: string description: >- Generation mode that determines which material combinations are valid. **Explicitly specifying it is recommended** **Values:** - `first_frame`: First-frame to video. Required: `image_start`. Optional: `audio_urls`. Not accepted: `image_end`, `video_urls` - `first_last_frame`: First-and-last-frame to video. Required: `image_start` + `image_end`. Optional: `audio_urls`. Not accepted: `video_urls` - `video_continuation`: Video continuation. Required: `video_urls[0]`. Optional: `image_end` (used as ending frame). Not accepted: `image_start`, `audio_urls` **Backward-compatible behavior:** when `generation_mode` is omitted, an appropriate mode will be selected automatically based on the materials in the request; explicit specification is recommended to avoid ambiguity enum: - first_frame - first_last_frame - video_continuation example: first_frame prompt: type: string description: >- Text prompt for video generation. Supports both Chinese and English; each character/letter counts as 1, with overflow auto-truncated. Maximum length: 5000 characters maxLength: 5000 example: A cat playing piano negative_prompt: type: string description: >- Negative prompt describing what should not appear in the video. Supports both Chinese and English. Maximum length 500 characters; overflow is auto-truncated maxLength: 500 example: Blurry, low quality image_start: type: string format: uri description: |- First-frame image URL **Mode constraints:** - `first_frame` mode: **required** - `first_last_frame` mode: **required** - `video_continuation` mode: **not allowed** **Image limits:** - Formats: JPEG, JPG, PNG (transparency not supported), BMP, WEBP - Resolution: width and height in `[240, 8000]` pixels - Aspect ratio: 1:8 ~ 8:1 - File size: up to `20MB` example: https://example.com/first_frame.jpg image_end: type: string format: uri description: >- Ending-frame image URL **Mode constraints:** - `first_last_frame` mode: **required** - `video_continuation` mode: optional (acts as the ending frame for the continuation) - `first_frame` mode: **not allowed** (use `first_last_frame` if both first and last frames are needed) **Image limits:** - Formats: JPEG, JPG, PNG (transparency not supported), BMP, WEBP - Resolution: width and height in `[240, 8000]` pixels - Aspect ratio: 1:8 ~ 8:1 - File size: up to `20MB` example: https://example.com/last_frame.jpg video_urls: type: array items: type: string format: uri description: >- Video continuation URL array. **Only 1 element is supported** **Mode constraints:** - `video_continuation` mode: **required** - `first_frame` / `first_last_frame` mode: **not allowed** - Cannot be combined with `audio_urls` **Video limits:** - Formats: mp4, mov - Duration: `2 ~ 10` seconds (length of the input clip itself) - Resolution: width and height in `[240, 4096]` pixels - Aspect ratio: 1:8 ~ 8:1 - File size: up to `100MB` **Continuation duration rules:** - `duration` represents the **total final output video length** (input clip + model-generated continuation) - Generated continuation length = `duration` − input video length - `duration` must be ≥ input video length - Billing is based on the total final output length (i.e. `duration`) **Examples:** | Input clip length | duration | Continuation generated | Final output | Billed | | --- | --- | --- | --- | --- | | 3s | 15 | 12s | 15s | 15s | | 5s | 10 | 5s | 10s | 10s | | 8s | 8 | 0s (input only) | 8s | 8s | example: - https://example.com/clip.mp4 audio_urls: type: array items: type: string format: uri minItems: 1 maxItems: 1 description: >- Driving audio URL array. **Currently supports only 1 element**. The model will use this audio as the driving source for video generation (e.g. lip sync, motion alignment) **Mode constraints:** - `first_frame` mode: optional - `first_last_frame` mode: optional - `video_continuation` mode: **not allowed** (cannot be combined with `video_urls`) **Format requirements:** - Supported formats: `wav`, `mp3` - Duration range: `2 ~ 30` seconds - File size: up to `15MB` **Truncation handling:** - If audio length exceeds `duration`, the first N seconds are extracted and the rest discarded - If audio length is shorter than the video duration, the remaining portion is silent. For example: if audio is 3s and video duration is 5s, the first 3s have sound and the last 2s are silent example: - https://example.com/audio.mp3 quality: type: string description: |- Video quality, defaults to `720p` **Options:** - `720p`: Standard definition, standard price, this is the default - `1080p`: High definition, higher price enum: - 720p - 1080p default: 720p example: 720p duration: type: number description: >- Video duration in seconds (integer). Range `2 ~ 15`, default `5` **Meaning:** - `first_frame` / `first_last_frame` modes: total length of the generated video - `video_continuation` mode: total length of the final output video (= original input clip + model-generated continuation) **Additional constraints in `video_continuation` mode:** - `duration` must be **≥ input video length** (otherwise an error is returned) - Generated continuation length = `duration` − input video length - When `duration` equals the input video length, no continuation is generated and the input clip is returned as-is - See the continuation duration rules and examples in the `video_urls` field for details **Billing:** based on the actual generated video duration minimum: 2 maximum: 15 default: 5 example: 5 seed: type: integer description: >- Random seed, defaults to random **Notes:** - Range: `1` ~ `2147483647` - Fixing the seed reduces variation when iterating on prompts and improves reproducibility minimum: 1 maximum: 2147483647 example: 42 prompt_extend: type: boolean description: >- Whether to enable intelligent prompt rewriting. When enabled, a large model will optimize the prompt, which significantly improves results for simple or insufficiently descriptive prompts. **Note:** Default is `false`. Omitting the field or sending `false` will not trigger rewriting; explicitly send `true` to enable. default: false example: false callback_url: type: string description: >- HTTPS callback URL for task completion **Callback Timing:** - Triggered when task is completed, failed, or cancelled - Sent after billing confirmation **Security Restrictions:** - Only HTTPS protocol is supported - Callbacks to internal IP addresses are prohibited (127.0.0.1, 10.x.x.x, 172.16-31.x.x, 192.168.x.x, etc.) - URL length must not exceed `2048` characters **Callback Mechanism:** - Timeout: `10` seconds - Up to `3` retries after failure (retries at `1`/`2`/`4` seconds after failure) - Callback response format is consistent with the task query API response - 2xx status codes are considered successful, other status codes trigger retries format: uri example: https://your-domain.com/webhooks/video-task-completed VideoGenerationResponse: type: object properties: created: type: integer description: Task creation timestamp example: 1757169743 id: type: string description: Task ID example: task-unified-1757169743-7cvnl5zw model: type: string description: Actual model name used example: wan2.7-image-to-video object: type: string enum: - video.generation.task description: Specific task type progress: type: integer description: Task progress percentage (0-100) minimum: 0 maximum: 100 example: 0 status: type: string description: Task status enum: - pending - processing - completed - failed example: pending task_info: $ref: '#/components/schemas/VideoTaskInfo' description: Detailed video task information type: type: string enum: - text - image - audio - video description: Task output type example: video usage: $ref: '#/components/schemas/Usage' description: Usage and billing information ErrorResponse: type: object properties: error: type: object properties: code: type: string description: Error code identifier message: type: string description: Error description type: type: string description: Error type VideoTaskInfo: type: object properties: can_cancel: type: boolean description: Whether the task can be cancelled example: true estimated_time: type: integer description: Estimated completion time (seconds) minimum: 0 example: 120 Usage: type: object description: Usage and billing information properties: billing_rule: type: string description: Billing rule enum: - per_call - per_token - per_second example: per_call credits_reserved: type: number description: Estimated credits to be consumed minimum: 0 example: 5 user_group: type: string description: User group category enum: - default - vip example: default securitySchemes: bearerAuth: type: http scheme: bearer description: >- ## All APIs require Bearer Token authentication ## **Get your API Key:** Visit the [API Key management page](https://evolink.ai/dashboard/keys) to obtain your API Key **Add to request headers:** ``` Authorization: Bearer YOUR_API_KEY ``` ````