> ## 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 Complete Parameter Guide > Unified API for all Seedance 2.0 models, select a specific model via the `model` parameter **3 Generation Modes:** - **Text-to-Video**: Generate video from pure text descriptions, supports web search enhancement - **Image-to-Video**: Use 1-2 images as first/last frames to drive video generation - **Reference-to-Video**: Mixed multimodal reference from images, videos, and audio Each mode has a standard and fast version, 6 models in total - **Now supports AIGC realistic human materials** - Asynchronous processing mode, use the returned task ID to [query task details](/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-overview.json POST /v1/videos/generations openapi: 3.1.0 info: title: Seedance 2.0 All Models API description: >- Unified API for all 6 Seedance 2.0 models, covering text-to-video, image-to-video, and multimodal reference-to-video in both standard and fast versions 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 Video Generation (All Models) description: >- Unified API for all Seedance 2.0 models, select a specific model via the `model` parameter **3 Generation Modes:** - **Text-to-Video**: Generate video from pure text descriptions, supports web search enhancement - **Image-to-Video**: Use 1-2 images as first/last frames to drive video generation - **Reference-to-Video**: Mixed multimodal reference from images, videos, and audio Each mode has a standard and fast version, 6 models in total - **Now supports AIGC realistic human materials** - Asynchronous processing mode, use the returned task ID to [query task details](/en/api-manual/task-management/get-task-detail) - Generated video links are valid for 24 hours, please save them promptly operationId: createSeedance20VideoGeneration requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/VideoGenerationRequest' examples: text_to_video: summary: Text-to-Video value: model: seedance-2.0-text-to-video prompt: 一只猫在钢琴上弹奏月光奏鸣曲，电影感光影，特写镜头 duration: 8 quality: 720p aspect_ratio: '16:9' generate_audio: true image_to_video: summary: Image-to-Video (first frame driven) value: model: seedance-2.0-image-to-video prompt: 镜头缓缓推进，花瓣随风飘落 image_urls: - https://example.com/flower.jpg duration: 5 aspect_ratio: adaptive generate_audio: true reference_to_video: summary: Multimodal reference (image + video + audio) value: model: seedance-2.0-reference-to-video prompt: 全程使用视频1的第一视角构图，全程使用音频1作为背景音乐。第一人称视角果茶宣传广告... 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 fast_text_to_video: summary: Fast Text-to-Video value: model: seedance-2.0-fast-text-to-video prompt: 城市日落延时摄影，金色光线洒满天际线 duration: 5 aspect_ratio: '21:9' 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 the specified model 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 | Model ID | Mode | Speed | |:--------|:-----|:-----| | `seedance-2.0-text-to-video` | Text-to-Video | Standard | | `seedance-2.0-image-to-video` | Image-to-Video | Standard | | `seedance-2.0-reference-to-video` | Multimodal Reference | Standard | | `seedance-2.0-fast-text-to-video` | Text-to-Video | Fast | | `seedance-2.0-fast-image-to-video` | Image-to-Video | Fast | | `seedance-2.0-fast-reference-to-video` | Multimodal Reference | Fast | enum: - seedance-2.0-text-to-video - seedance-2.0-image-to-video - seedance-2.0-reference-to-video - seedance-2.0-fast-text-to-video - seedance-2.0-fast-image-to-video - seedance-2.0-fast-reference-to-video example: seedance-2.0-text-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 **Prompt usage for different models:** - **Text-to-Video**: Pure text description, does not support using `image_urls`, `video_urls`, `audio_urls` in the prompt - **Image-to-Video**: Pure text description, does not support using `video_urls`, `audio_urls` in the prompt - **Reference-to-Video**: 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" example: 一只猫在钢琴上弹奏月光奏鸣曲，电影感光影，特写镜头 image_urls: type: array description: >- Image URL array **Applicable models and quantity limits:** - **Text-to-Video**: Not supported - **Image-to-Video**: Required, **1-2 images** - **Reference-to-Video**: Optional, **0-9 images** **Image-to-Video image behavior:** | Image Count | Behavior | Role | |:--------:|------|------| | 1 | First frame image-to-video | Automatically set as `first_frame` | | 2 | First and last frame image-to-video | 1st image -> `first_frame`, 2nd image -> `last_frame` | **Reference-to-Video image roles:** - Style reference, product image, character appearance, 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` - 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 match - Image URLs must be directly accessible by the server items: type: string format: uri maxItems: 9 example: - https://example.com/image1.jpg video_urls: type: array description: >- Reference video URL array **Only applicable to Reference-to-Video models**, other models do not support this parameter **Quantity limit:** 0-3 videos **Role description:** - 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 x height): `409,600` ~ `2,086,876` (e.g., 640x640 ~ 2206x946) - Max size per video: `50MB` - Frame rate: `24` ~ `60` FPS - 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 **Only applicable to Reference-to-Video models**, other models do not support this parameter **Quantity limit:** 0-3 clips **Role description:** - 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` - Audio URLs must be directly accessible by the server **Note:** Audio cannot be provided alone; at least 1 image or 1 video 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 - Supports any integer value between `4`-`15` seconds - Duration directly affects billing - Applicable to all 6 models default: 5 minimum: 4 maximum: 15 example: 8 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, **only supported by standard models** (Text-to-Video, Image-to-Video, Reference-to-Video); the 3 Fast models are not supported `480p` and `720p` apply to all 6 models 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 select the best ratio **`adaptive` behavior per model:** - **Text-to-Video**: Automatically selected based on prompt content - **Image-to-Video**: Automatically adapts based on first frame image aspect ratio - **Reference-to-Video**: Priority: video material ratio > image material ratio > prompt inference **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 | *1080p only supported by standard models* 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` - `true`: Video includes synchronized audio (voice, sound effects, background music) at no additional charge - `false`: Output silent video Applicable to all 6 models default: true example: true model_params: type: object description: >- Model extension parameters **Only applicable to Text-to-Video models** (standard and fast versions) properties: web_search: type: boolean description: >- Web search, defaults to `false` **Only applicable to Text-to-Video models** (`seedance-2.0-text-to-video` and `seedance-2.0-fast-text-to-video`) **Details:** - When enabled, the model autonomously decides whether to search internet content (e.g., products, weather) based on the prompt, improving timeliness - May increase latency - Charges only apply when a search is actually triggered; multiple searches may occur after enabling default: false example: false 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 Applicable to all 6 models 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-text-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 ``` ````