> ## 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. # Seedance 2.0 Image-to-Video > - Input 1 image for first-frame video generation, input 2 images for first-last-frame video generation, the model determines automatically - **Now supports AIGC realistic human materials** - 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/seedance2.0/seedance-2.0-image-to-video.json POST /v1/videos/generations openapi: 3.1.0 info: title: Seedance 2.0 Image-to-Video API description: >- Seedance 2.0 image-to-video API, supports first-frame and first-last-frame image-to-video generation license: name: MIT version: 1.0.0 servers: - url: https://api.evolink.ai description: Production security: - bearerAuth: [] tags: - name: Video Generation description: AI video generation endpoints paths: /v1/videos/generations: post: tags: - Video Generation summary: Seedance 2.0 Image-to-Video description: >- - Input 1 image for first-frame video generation, input 2 images for first-last-frame video generation, the model determines automatically - **Now supports AIGC realistic human materials** - 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: createSeedance20ImageToVideo requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/VideoGenerationRequest' examples: first_frame: summary: First-frame image-to-video value: model: seedance-2.0-image-to-video prompt: >- The camera slowly zooms in, the scene gradually comes to life image_urls: - https://example.com/first-frame.jpg duration: 5 aspect_ratio: adaptive first_last_frame: summary: First-last-frame image-to-video value: model: seedance-2.0-image-to-video prompt: A smooth transition between two scenes image_urls: - https://example.com/first.jpg - https://example.com/last.jpg duration: 6 aspect_ratio: '16:9' responses: '200': description: Video generation 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, token invalid or expired 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: Access denied content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: model_access_denied message: >- Token does not have access to model: seedance-2.0-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: VideoGenerationRequest: type: object required: - model - prompt - image_urls properties: model: type: string description: Video generation model name enum: - seedance-2.0-image-to-video default: seedance-2.0-image-to-video example: seedance-2.0-image-to-video prompt: type: string description: >- Text prompt describing the desired video. Supports both Chinese and English, recommended no more than 500 characters for Chinese or 1000 words for English **Note:** - This model does not support `video_urls` or `audio_urls` input example: The camera slowly zooms in, the scene gradually comes to life image_urls: type: array description: >- Image URL array, **1–2 images** **Image count and behavior:** | Image Count | Behavior | Role | |:--------:|------|------| | 1 image | First-frame image-to-video | Automatically set as `first_frame` | | 2 images | First-last-frame image-to-video | 1st image → `first_frame`, 2nd image → `last_frame` | **Image requirements:** - Supported formats: `.jpeg`, `.png`, `.webp` - Aspect ratio (width/height): `0.4` ~ `2.5` - Width/height pixels: `300` ~ `6000` px - Max size per image: `30MB` - Total request body size must not exceed `64MB` - When providing first and last frames, both images can be identical. If aspect ratios differ, the first frame takes priority and the last frame will be automatically cropped to fit - Image URLs must be directly accessible by the server items: type: string format: uri minItems: 1 maxItems: 2 example: - https://example.com/first-frame.jpg duration: type: integer description: |- Video duration (seconds), defaults to `5` seconds **Details:** - Supports any integer value between `4`–`15` seconds - Duration directly affects billing default: 5 minimum: 4 maximum: 15 example: 5 quality: type: string description: |- Video resolution, defaults to `720p` **Options:** - `480p`: Lower clarity, lower cost - `720p`: Standard clarity, this is the default - `1080p`: Ultra HD clarity enum: - 480p - 720p - 1080p default: 720p example: 720p aspect_ratio: type: string description: >- Video aspect ratio, defaults to `16:9` **Options:** - `16:9` (landscape), `9:16` (portrait), `1:1` (square), `4:3`, `3:4`, `21:9` (ultrawide) - `adaptive`: Automatically selects the closest aspect ratio based on the first-frame image proportions **Pixel values per resolution:** | Aspect Ratio | 480p | 720p | 1080p | |:------:|:----:|:----:|:-----:| | 16:9 | 864×496 | 1280×720 | 1920×1080 | | 4:3 | 752×560 | 1112×834 | 1664×1248 | | 1:1 | 640×640 | 960×960 | 1440×1440 | | 3:4 | 560×752 | 834×1112 | 1248×1664 | | 9:16 | 496×864 | 720×1280 | 1080×1920 | | 21:9 | 992×432 | 1470×630 | 2206×946 | enum: - '16:9' - '9:16' - '1:1' - '4:3' - '3:4' - '21:9' - adaptive default: '16:9' example: adaptive generate_audio: type: boolean description: |- Whether to generate synchronized audio, defaults to `true` **Options:** - `true`: Video includes synchronized audio at no additional charge - `false`: Output silent video default: true example: true callback_url: type: string description: >- HTTPS callback URL for task completion **Callback timing:** - Triggered when the task is completed, failed, or cancelled - Sent after billing confirmation is complete **Security restrictions:** - Only HTTPS protocol is supported - Callbacks to private 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 (at `1`/`2`/`4` seconds after failure respectively) - Callback response body format is consistent with the task query endpoint response format - A 2xx status code is 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: 1761313744 id: type: string description: Task ID example: task-unified-1774857405-abc123 model: type: string description: Actual model name used example: seedance-2.0-image-to-video object: type: string enum: - video.generation.task description: Specific type of the task 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: Video task details type: type: string enum: - text - image - audio - video description: Output type of the task example: video usage: $ref: '#/components/schemas/VideoUsage' 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 message 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: 165 video_duration: type: integer description: Video duration (seconds) example: 8 VideoUsage: type: object description: Usage and billing information properties: billing_rule: type: string description: Billing rule enum: - per_call - per_token - per_second example: per_second credits_reserved: type: number description: Estimated credits consumed minimum: 0 example: 50 user_group: type: string description: User group category example: default securitySchemes: bearerAuth: type: http scheme: bearer description: >- ##All endpoints require Bearer Token authentication## **Get API Key:** Visit the [API Key Management Page](https://evolink.ai/dashboard/keys) to obtain your API Key **Add to request header:** ``` Authorization: Bearer YOUR_API_KEY ``` ````