> ## 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 Reference-to-Video > - Input reference images (0–9) + reference videos (0–3) + reference audio (0–3) + text prompt to generate video - Supports various creative scenarios including new generation, video editing, and video extension - **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-reference-to-video.json POST /v1/videos/generations openapi: 3.1.0 info: title: Seedance 2.0 Reference-to-Video API description: >- Seedance 2.0 multimodal reference-to-video API, supports mixed generation from image, video, and audio reference materials 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 Reference-to-Video description: >- - Input reference images (0–9) + reference videos (0–3) + reference audio (0–3) + text prompt to generate video - Supports various creative scenarios including new generation, video editing, and video extension - **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: createSeedance20ReferenceToVideo requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/VideoGenerationRequest' examples: multimodal: summary: Multimodal reference (image + video + audio) value: model: seedance-2.0-reference-to-video prompt: >- Use the first-person perspective framing of video 1 throughout, use audio 1 as background music throughout. First-person perspective fruit tea promotional video... image_urls: - https://example.com/ref1.jpg - https://example.com/ref2.jpg video_urls: - https://example.com/reference.mp4 audio_urls: - https://example.com/bgm.mp3 duration: 10 quality: 720p aspect_ratio: '16:9' generate_audio: true video_edit: summary: Edit video (replace elements) value: model: seedance-2.0-reference-to-video prompt: >- Replace the perfume in the gift box in video 1 with the face cream in image 1, keep the camera movement unchanged image_urls: - https://example.com/cream.jpg video_urls: - https://example.com/original.mp4 duration: 5 aspect_ratio: '16:9' video_extend: summary: Extend video (multi-segment concatenation) value: model: seedance-2.0-reference-to-video prompt: >- The arched window in video 1 opens, entering the art gallery interior, continuing with video 2, then the camera enters the painting, continuing with video 3 video_urls: - https://example.com/part1.mp4 - https://example.com/part2.mp4 - https://example.com/part3.mp4 duration: 8 aspect_ratio: '16:9' generate_audio: true 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-reference-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 properties: model: type: string description: Video generation model name enum: - seedance-2.0-reference-to-video default: seedance-2.0-reference-to-video example: seedance-2.0-reference-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 **Details:** - You can use natural language to specify the purpose of each material, e.g., "use image 1 as the first frame", "use the camera movement from video 1 throughout", "use audio 1 as background music" - The model will automatically understand the correspondence between material numbers and their intended uses example: >- Use the first-person perspective framing of video 1 throughout, use audio 1 as background music throughout. First-person perspective fruit tea promotional video... image_urls: type: array description: >- Reference image URL array, **0–9 images** **Role description:** | Media Type | Role | Typical Usage | |---------|------|----------| | Image | `reference_image` | Style reference, product image, first/last frame (specified via prompt) | **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`, do not use Base64 encoding - Image URLs must be directly accessible by the server **Note:** You cannot provide only `audio_urls`; at least 1 image (`image_urls`) or 1 video (`video_urls`) must be included items: type: string format: uri maxItems: 9 example: - https://example.com/ref1.jpg - https://example.com/ref2.jpg video_urls: type: array description: >- Reference video URL array, **0–3 videos** **Role description:** | Media Type | Role | Typical Usage | |---------|------|----------| | Video | `reference_video` | Camera movement reference, motion reference, original video for editing/extension | **Video requirements:** - Supported formats: `.mp4`, `.mov` - Resolution: 480p, 720p, 1080p - Duration per video: `2` ~ `15` seconds, max 3 videos, total duration of all videos ≤ `15` seconds - Aspect ratio (width/height): `0.4` ~ `2.5` - Width/height pixels: `300` ~ `6000` px - Frame pixels (width × height): `409,600` ~ `2,086,876` (e.g., 640×640 ~ 2206×946) - Max size per video: `50MB` - Frame rate: `24` ~ `60` FPS - Total request body size must not exceed `64MB`, do not use Base64 encoding - Using video references will increase costs (input video duration is counted in billing) - Video URLs must be directly accessible by the server **Note:** You cannot provide only `audio_urls`; at least 1 image (`image_urls`) or 1 video (`video_urls`) must be included items: type: string format: uri maxItems: 3 example: - https://example.com/reference.mp4 audio_urls: type: array description: >- Reference audio URL array, **0–3 clips** **Role description:** | Media Type | Role | Typical Usage | |---------|------|----------| | Audio | `reference_audio` | Background music, sound effects, voice/dialogue reference | **Audio requirements:** - Supported formats: `.wav`, `.mp3` - Duration per clip: `2` ~ `15` seconds, max 3 clips, total duration of all audio ≤ `15` seconds - Max size per clip: `15MB` - Total request body size must not exceed `64MB`, do not use Base64 encoding - Audio URLs must be directly accessible by the server **Note:** Audio cannot be provided alone; at least 1 reference video or image must be included items: type: string format: uri maxItems: 3 example: - https://example.com/bgm.mp3 duration: type: integer description: |- Output 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: 10 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`: Determined based on prompt intent, priority: video > image > prompt **Pixel values per resolution:** | Aspect Ratio | 480p | 720p | |:------:|:----:|:----:| | 16:9 | 864×496 | 1280×720 | | 4:3 | 752×560 | 1112×834 | | 1:1 | 640×640 | 960×960 | | 3:4 | 560×752 | 834×1112 | | 9:16 | 496×864 | 720×1280 | | 21:9 | 992×432 | 1470×630 | enum: - '16:9' - '9:16' - '1:1' - '4:3' - '3:4' - '21:9' - adaptive default: '16:9' example: '16:9' 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-reference-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 ``` ```` > ## 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. # Query Task Status > Query the status, progress, and result information of asynchronous tasks by task ID ## OpenAPI ````yaml en/api-manual/task-management/get-task-detail.json get /v1/tasks/{task_id} openapi: 3.1.0 info: title: Get Task Details API description: >- Query the status, progress, and result information of asynchronous tasks by task ID license: name: MIT version: 1.0.0 servers: - url: https://api.evolink.ai description: Production environment security: - bearerAuth: [] tags: - name: Task Management description: Asynchronous task management related APIs paths: /v1/tasks/{task_id}: get: tags: - Task Management summary: Query Task Status description: >- Query the status, progress, and result information of asynchronous tasks by task ID operationId: getTaskDetail parameters: - name: task_id in: path required: true schema: type: string description: >- Task ID, ignore {} when querying, append the id from the async task response body at the end of the path example: task-unified-1774857405-abc123 responses: '200': description: Task status details content: application/json: schema: $ref: '#/components/schemas/TaskDetailResponse' '400': description: Request parameter error, format error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: invalid_task_id message: Invalid task ID format, must start with 'task-unified-' type: invalid_request_error param: task_id '401': description: Unauthenticated, token invalid or expired content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: unauthorized message: Authentication required type: authentication_error '402': description: Insufficient quota, recharge required content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: quota_exceeded message: Insufficient quota. Please top up your account. type: insufficient_quota '403': description: No permission to access content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: permission_denied message: You don't have permission to access this task type: invalid_request_error '404': description: Resource does not exist content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: task_not_found message: The requested task could not be found type: invalid_request_error '429': description: Request rate limit exceeded content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: rate_limit_exceeded message: Rate limit exceeded type: evo_api_error '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: internal_error message: Failed to retrieve task status type: api_error components: schemas: TaskDetailResponse: type: object properties: created: type: integer description: Task creation timestamp example: 1774857405 id: type: string description: Task ID example: task-unified-1774857405-abc123 model: type: string description: Model used example: seedance-2.0-reference-to-video object: type: string description: Task type enum: - image.generation.task - video.generation.task - audio.generation.task example: video.generation.task progress: type: integer minimum: 0 maximum: 100 description: Task progress percentage example: 100 results: type: array items: type: string format: uri description: Task result list (provided when completed) example: - http://example.com/video.mp4 status: type: string description: Task status enum: - pending - processing - completed - failed example: completed error: type: object nullable: true description: >- Error information when the task fails (only present when status is "failed"). Note: error.code here is a string-type business error code, different from HTTP status codes. See the Error Codes Reference for the complete list. properties: code: type: string description: Business error code (string type) example: content_policy_violation message: type: string description: User-friendly error description with troubleshooting tips example: |- Content policy violation. Your request was blocked by safety filters. type: type: string description: Error type identifier, always "task_error" example: task_error task_info: type: object description: Task detailed information properties: can_cancel: type: boolean description: Whether the task can be cancelled example: false type: type: string description: Task type enum: - image - video - audio - text example: video ErrorResponse: type: object properties: error: type: object properties: code: type: string description: Error code (string type) example: invalid_task_id message: type: string description: Error description message example: Invalid task ID format type: type: string description: Error type example: invalid_request_error param: type: string description: Related parameter name example: task_id securitySchemes: bearerAuth: type: http scheme: bearer description: >- ##All APIs require Bearer Token authentication## **Get API Key:** Visit [API Key Management Page](https://evolink.ai/dashboard/keys) to get your API Key **Add to request header:** ``` Authorization: Bearer YOUR_API_KEY ``` ````