> ## Documentation Index > Fetch the complete documentation index at: https://evolink.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # Minimax H3 Image-to-Video > - Provide at least one of `image_start` or `image_end`; first-frame-only, last-frame-only, and first-and-last-frame modes are supported - Output duration: `5`–`15` seconds; currently only `2k` is supported - The input image determines the output ratio; `aspect_ratio` is treated as `adaptive` - Asynchronous processing; use the returned task ID to [query status](/en/api-manual/task-management/get-task-detail) - Generated video URLs are valid for 24 hours; save them promptly ## OpenAPI ````yaml en/api-manual/video-series/minimax/minimax-h3-image-to-video.json POST /v1/videos/generations openapi: 3.1.0 info: title: Minimax H3 Image-to-Video API description: >- Minimax H3 image-to-video API supporting first-frame, last-frame, and first-and-last-frame 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: Minimax H3 Image-to-Video description: >- - Provide at least one of `image_start` or `image_end`; first-frame-only, last-frame-only, and first-and-last-frame modes are supported - Output duration: `5`–`15` seconds; currently only `2k` is supported - The input image determines the output ratio; `aspect_ratio` is treated as `adaptive` - Asynchronous processing; use the returned task ID to [query status](/en/api-manual/task-management/get-task-detail) - Generated video URLs are valid for 24 hours; save them promptly operationId: createMinimaxH3ImageToVideo requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/VideoGenerationRequest' examples: first_frame: summary: First-frame image-to-video value: model: minimax-h3-image-to-video prompt: >- Pull focus from the ramen bowl in the foreground to the people in the background. More steam rises naturally from the bowl as the camera gently pushes forward; preserve the characters and restaurant setting. image_start: >- https://cdn.hailuoai.com/prod/hailuo_demo/testsets/H3_AA_I2VA/gallery/sr_v17_variants_seed42_43_20260724/inputs/4a3a90bf9100_KDmcbkhzYo5sjjxr9FqcVmWVnzb.png duration: 5 quality: 2k last_frame: summary: Last-frame image-to-video value: model: minimax-h3-image-to-video prompt: >- Begin with a wide restaurant view and slowly push in as the characters converse naturally. The ramen steam becomes clearer, ending precisely on the composition and poses of the supplied last frame. image_end: >- https://cdn.hailuoai.com/prod/hailuo_demo/testsets/H3_AA_I2VA/gallery/sr_v17_variants_seed42_43_20260724/inputs/4a3a90bf9100_KDmcbkhzYo5sjjxr9FqcVmWVnzb.png duration: 5 quality: 2k first_last_frame: summary: First-and-last-frame image-to-video value: model: minimax-h3-image-to-video prompt: >- Slowly pull back from an extreme close-up of the character's eye to reveal the complete restaurant. Keep the motion continuous and transition precisely into the final-frame composition. image_start: >- https://cdn.hailuoai.com/prod/hailuo_demo/testsets/H3_AA_I2VA/gallery/sr_v17_variants_seed42_43_20260724/inputs/4a3a90bf9100_KDmcbkhzYo5sjjxr9FqcVmWVnzb.png image_end: >- https://images.unsplash.com/photo-1515003197210-e0cd71810b5f?auto=format&fit=crop&w=1920&q=85 duration: 8 quality: 2k 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: minimax-h3-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 properties: model: type: string description: Video generation model name enum: - minimax-h3-image-to-video default: minimax-h3-image-to-video example: minimax-h3-image-to-video prompt: type: string minLength: 1 description: >- Describe how the input image should move, how the camera should change, and the desired video content. **Prompt requirements:** - Required and cannot be empty - Chinese and English are supported - We recommend no more than `500` Chinese characters or `1000` English words; the model may ignore some details in an overly long prompt **Input restrictions:** - Use `image_start` and/or `image_end` to provide keyframes - `image_urls`, `video_urls`, and `audio_urls` are not supported; supplying them returns a parameter error example: >- Pull focus from the ramen bowl in the foreground to the people in the background. More steam rises naturally from the bowl as the camera gently pushes forward; preserve the characters and restaurant setting. image_start: type: string format: uri description: >- HTTP(S) URL of the first-frame image. **Combination rules:** - Provide at least one of `image_start` and `image_end` - `image_start` only: first-frame image-to-video - Both fields: first-and-last-frame image-to-video - At most `1` first frame; this field accepts one URL **Image requirements:** - Formats: JPG, JPEG, PNG, WEBP, HEIC, HEIF - File size: no more than `30MB` - Width and height: each from `256` to `5760` px - Aspect ratio (width/height): `0.4`–`2.5` - The URL must use HTTP(S) and be directly accessible by the service - The complete JSON request body must not exceed `64MB`; Base64 and `mm_file://` inputs are not accepted example: >- https://cdn.hailuoai.com/prod/hailuo_demo/testsets/H3_AA_I2VA/gallery/sr_v17_variants_seed42_43_20260724/inputs/4a3a90bf9100_KDmcbkhzYo5sjjxr9FqcVmWVnzb.png image_end: type: string format: uri description: >- HTTP(S) URL of the last-frame image. **Combination rules:** - Provide at least one of `image_end` and `image_start` - `image_end` only: the model generates natural motion that ends on this frame - Both fields: first-and-last-frame image-to-video - At most `1` last frame; this field accepts one URL **Image requirements:** - Formats: JPG, JPEG, PNG, WEBP, HEIC, HEIF - File size: no more than `30MB` - Width and height: each from `256` to `5760` px - Aspect ratio (width/height): `0.4`–`2.5` - The URL must use HTTP(S) and be directly accessible by the service - The complete JSON request body must not exceed `64MB`; Base64 and `mm_file://` inputs are not accepted example: >- https://images.unsplash.com/photo-1515003197210-e0cd71810b5f?auto=format&fit=crop&w=1920&q=85 duration: type: integer description: |- Output video duration in seconds. Defaults to `5` seconds. **Value restrictions:** - Only integers from `5` through `15`, inclusive, are supported - Decimals, numeric strings, `auto`, and `-1` are not supported - Output duration directly affects billing default: 5 minimum: 5 maximum: 15 example: 5 quality: type: string description: >- Output video resolution. Defaults to `2k`. **Available value:** - `2k`: the only resolution currently supported **Notes:** - `768p` is not yet available and returns a parameter error - Output bitrate, frame rate, video codec, and audio codec are selected by the platform and are not configurable enum: - 2k default: 2k example: 2k callback_url: type: string description: >- HTTPS callback URL for task completion **Callback timing:** - Triggered when the task is completed or failed - 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 pattern: ^https:// additionalProperties: false 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: minimax-h3-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 canceled. Minimax H3 tasks cannot be canceled; always `false`. example: false enum: - false default: false 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 ``` ````