> ## 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. # HappyHorse 1.0 Video-Edit > - HappyHorse 1.0 video edit, takes 1 source video and text instructions to perform style transfer, local replacement, etc. - Optionally accepts 0–5 reference images for style / subject guidance - **Does not support** `duration`: output video duration = `min(input video duration, 15)`, determined by the model - **Does not support** `aspect_ratio`: output aspect ratio matches the source video - **Special billing rule**: `(input video duration + output video duration) × resolution unit price`; the model truncates inputs longer than 15 seconds to 15 seconds - 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/happyhorse1.0/happyhorse-1.0-video-edit.json POST /v1/videos/generations openapi: 3.1.0 info: title: HappyHorse 1.0 Video-Edit API description: >- HappyHorse 1.0 video editing API, performs style transfer, local replacement, etc., based on a source video and text instructions 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: HappyHorse 1.0 Video-Edit description: >- - HappyHorse 1.0 video edit, takes 1 source video and text instructions to perform style transfer, local replacement, etc. - Optionally accepts 0–5 reference images for style / subject guidance - **Does not support** `duration`: output video duration = `min(input video duration, 15)`, determined by the model - **Does not support** `aspect_ratio`: output aspect ratio matches the source video - **Special billing rule**: `(input video duration + output video duration) × resolution unit price`; the model truncates inputs longer than 15 seconds to 15 seconds - 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: createHappyHorse10VideoEdit requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/VideoGenerationRequest' examples: with_reference: summary: Video edit with reference image value: model: happyhorse-1.0-video-edit prompt: >- Have the character in the video wear the striped sweater from the image video_urls: - https://cdn.example.com/source.mp4 image_urls: - https://cdn.example.com/sweater.jpg quality: 720p keep_original_sound: true style_transfer: summary: Style transfer (no reference image) value: model: happyhorse-1.0-video-edit prompt: Replace the video background with snowy mountains video_urls: - https://cdn.example.com/source.mp4 quality: 1080p keep_original_sound: false 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: missing_video_urls message: happyhorse-1.0-video-edit requires video_urls or video_url 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: happyhorse-1.0-video-edit 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 - video_urls properties: model: type: string description: Video generation model name enum: - happyhorse-1.0-video-edit default: happyhorse-1.0-video-edit example: happyhorse-1.0-video-edit prompt: type: string description: >- Edit instruction text, **required** **Length limits:** - Chinese: up to `2500` characters - Non-Chinese: up to `5000` characters - Excess content is automatically truncated **Prompt tips:** - Use editing instructions instead of creative descriptions - Examples: `Replace the protagonist's clothes with the striped sweater in the image`, `Replace the video background with snowy mountains` example: >- Have the character in the video wear the striped sweater from the image video_urls: type: array description: >- Source video URL to edit, **required**, **only 1** (the first item of the array is taken) **Video requirements:** - Supported formats: MP4, MOV (H.264 encoding recommended) - Duration: `3` ~ `60` seconds - The model automatically truncates inputs longer than `15` seconds to the first `15` seconds - Resolution: long edge ≤ `2160` px, short edge ≥ `320` px - Aspect ratio: `1:2.5` ~ `2.5:1` - File size: ≤ `100MB` - Frame rate: > `8` fps - Video URL must be **publicly accessible (HTTP or HTTPS)**; private OSS, intranet, or authenticated links are not supported **Compatible fields:** `video_url` / `video` are also accepted (lower priority than `video_urls`) items: type: string format: uri minItems: 1 maxItems: 1 example: - https://cdn.example.com/source.mp4 image_urls: type: array description: |- Reference image URL array, **optional**, **0 ~ 5 images** Used for style / subject guidance. **Image requirements:** - Supported formats: JPEG, JPG, PNG, WEBP - Resolution: width and height ≥ `300` px - Aspect ratio: `1:2.5` ~ `2.5:1` - File size: ≤ `10MB` - Image URLs must be **publicly accessible (HTTP or HTTPS)** items: type: string format: uri maxItems: 5 example: - https://cdn.example.com/sweater.jpg keep_original_sound: type: boolean description: >- Whether to keep the original audio of the input video, defaults to `false` **Options:** - `true`: Keep the original audio of the input video - `false`: Discard the original audio; the model generates new audio default: false example: false quality: type: string description: |- Video resolution tier, defaults to `720p` **Options:** - `720p`: Standard clarity, this is the default - `1080p`: HD clarity **Billing note:** Resolution tier directly affects billing enum: - 720p - 1080p default: 720p example: 720p seed: type: integer description: >- Random seed, default is random **Details:** - Range: `1` ~ `2147483647` - A fixed seed reduces parameter-induced variation when iterating on prompts and improves reproducibility minimum: 1 maximum: 2147483647 example: 42 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-1761313744-h1edgh12 model: type: string description: Actual model name used example: happyhorse-1.0-video-edit 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 - cancelled 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: 2400 video_duration: type: integer description: >- Output video duration (seconds), equals min(input video duration, 15) example: 6 VideoUsage: type: object description: >- Usage and billing information. EDIT billing = (input video duration + output video duration) × resolution unit price; pre-deduction is estimated as locally detected input duration × 2, and the actual deduction is reconciled based on the model-returned usage field 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 (pre-deducted as input duration × 2) minimum: 0 example: 1608660 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 ``` ````