> ## 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. # Gemini Omni 1.1 Flash Video Extend > - Extend one input video using optional reference images and a text prompt - `video_urls`: Exactly one directly reachable HTTP/HTTPS MP4, no longer than 30 seconds. - `image_urls`: Optional reference image URLs, up to 10 images. HTTP/HTTPS only. Each image contributes input tokens. - `quality`: Output resolution: 360p, 720p, 1080p, 4k, or auto. Default: auto; auto follows the input video's resolution. - `duration`: Seconds appended after the input video. Integer from 3 to 10; default 3. - `aspect_ratio`: Only auto is accepted and it is the default. Output aspect ratio follows the input video. - The model generates synchronized native audio automatically. - Write negative requirements directly in prompt. - Asynchronous processing: [query task status](/en/api-manual/task-management/get-task-detail) - Generated links remain valid for 24 hours; save them promptly. - **Billing scope:** Output-video usage is calculated from the appended seconds. The input video, reference images, prompt, and model reasoning also contribute to usage; final charges follow actual token usage. - **Input-video cost and `quality`:** Input video tokens are calculated using the selected output resolution, not the source video's original resolution. ## OpenAPI ````yaml en/api-manual/video-series/gemini-omni-1.1-flash/gemini-omni-1.1-flash-video-extend.json POST /v1/videos/generations openapi: 3.1.0 info: title: Gemini Omni 1.1 Flash Video Extend description: Extend one input video using optional reference images and a text prompt license: name: MIT version: 1.0.0 servers: - url: https://api.evolink.ai description: Production environment security: - bearerAuth: [] paths: /v1/videos/generations: post: tags: - Video Generation summary: Gemini Omni 1.1 Flash Video Extend description: >- - Extend one input video using optional reference images and a text prompt - `video_urls`: Exactly one directly reachable HTTP/HTTPS MP4, no longer than 30 seconds. - `image_urls`: Optional reference image URLs, up to 10 images. HTTP/HTTPS only. Each image contributes input tokens. - `quality`: Output resolution: 360p, 720p, 1080p, 4k, or auto. Default: auto; auto follows the input video's resolution. - `duration`: Seconds appended after the input video. Integer from 3 to 10; default 3. - `aspect_ratio`: Only auto is accepted and it is the default. Output aspect ratio follows the input video. - The model generates synchronized native audio automatically. - Write negative requirements directly in prompt. - Asynchronous processing: [query task status](/en/api-manual/task-management/get-task-detail) - Generated links remain valid for 24 hours; save them promptly. - **Billing scope:** Output-video usage is calculated from the appended seconds. The input video, reference images, prompt, and model reasoning also contribute to usage; final charges follow actual token usage. - **Input-video cost and `quality`:** Input video tokens are calculated using the selected output resolution, not the source video's original resolution. operationId: createGeminiOmni11FlashVideoExtendGeneration requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/GeminiOmni11FlashVideoExtendRequest' examples: video_extend: summary: Video extend value: model: gemini-omni-1.1-flash-video-extend prompt: The person keeps walking and slowly exits the frame. video_urls: - https://example.com/source.mp4 duration: 3 quality: auto aspect_ratio: auto video_extend_with_reference: summary: Video extend with reference image value: model: gemini-omni-1.1-flash-video-extend prompt: >- The person continues walking while retaining the reference clothing style. video_urls: - https://example.com/source.mp4 image_urls: - https://example.com/reference.png duration: 3 quality: auto aspect_ratio: auto responses: '200': description: Video 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: Not authenticated, 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: gemini-omni-1.1-flash-video-extend 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: GeminiOmni11FlashVideoExtendRequest: required: - model - prompt - video_urls type: object additionalProperties: false properties: model: type: string description: Model name, fixed to `gemini-omni-1.1-flash-video-extend` enum: - gemini-omni-1.1-flash-video-extend example: gemini-omni-1.1-flash-video-extend default: gemini-omni-1.1-flash-video-extend prompt: type: string description: >- Text prompt describing what should happen after the input video ends. example: The person keeps walking and slowly exits the frame. video_urls: type: array items: type: string format: uri minItems: 1 maxItems: 1 description: >- Exactly one directly reachable HTTP/HTTPS MP4, no longer than 30 seconds. example: - https://example.com/source.mp4 image_urls: type: array items: type: string format: uri minItems: 1 maxItems: 10 description: >- Optional reference image array, up to 10 images. It may be used with the video being extended to constrain subjects, style, or elements. **Input requirements:** - HTTP/HTTPS image URLs only - Supported formats: `png`, `jpeg`, `webp` **Billing:** Every reference image contributes input tokens. example: - https://example.com/reference.png duration: type: integer description: >- Appended video duration in seconds; default `3`. **Notes:** - Accepts any integer from `3` to `10` - Specifies how many seconds are generated after the input video, not the total output duration - Total output duration = input video duration + `duration` - Appended duration directly affects billing minimum: 3 maximum: 10 default: 3 example: 3 quality: type: string description: >- Output video resolution; default `auto`. **Supported values:** - `360p`: short side 360 - `720p`: short side 720 - `1080p`: short side 1080 - `4k`: short side 2160 - `auto`: follows the input video's resolution; default Choosing a specific resolution can upscale or downscale the output. **Billing:** Input and output video tokens are both calculated using the final output resolution; higher resolutions cost more. enum: - 360p - 720p - 1080p - 4k - auto default: auto example: auto aspect_ratio: type: string description: >- Only auto is accepted and it is the default. Output aspect ratio follows the input video. enum: - auto default: auto example: auto callback_url: type: string description: >- HTTPS callback URL to notify when the task completes **Callback timing:** - Triggered when the task completes (completed), fails (failed), or is cancelled (cancelled) - Sent after billing is confirmed **Security restrictions:** - HTTPS protocol only - Callbacks to internal IP addresses are forbidden (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 on failure (retried `1`s / `2`s / `4`s after each failure respectively) - The callback body format matches the response of the task query endpoint - A 2xx status code from the callback URL is treated as success; other status codes trigger a retry format: uri example: https://your-domain.com/webhooks/video-task-completed VideoGenerationResponse: type: object properties: created: type: integer description: Task creation timestamp example: 1757169743 id: type: string description: Task ID example: task-unified-1757169743-7cvnl5zw model: type: string description: The model name actually used example: gemini-omni-1.1-flash-video-extend object: type: string enum: - video.generation.task description: The 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. The create endpoint returns processing. enum: - pending - processing - completed - failed example: processing task_info: $ref: '#/components/schemas/VideoTaskInfo' description: Detailed video task information type: type: string enum: - text - image - audio - video description: The output type of the task example: video usage: $ref: '#/components/schemas/Usage' 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: false estimated_time: type: integer description: Estimated completion time (seconds) minimum: 0 example: 60 video_duration: type: integer description: 'Total output duration: input duration plus appended duration.' example: 6 Usage: type: object description: Usage and billing information properties: billing_rule: type: string description: Billing rule enum: - per_call - per_token - per_second example: per_token credits_reserved: type: number description: Estimated credits to be consumed minimum: 0 example: 102.34 user_group: type: string description: Billing group the user belongs to example: default securitySchemes: bearerAuth: type: http scheme: bearer description: >- ##All endpoints require authentication using a Bearer Token## **Get your API Key:** Visit the [API Key management page](https://evolink.ai/dashboard/keys) to obtain your API Key **Add it to the request header:** ``` Authorization: Bearer YOUR_API_KEY ``` ````