> ## 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. # Kling-O3 Reference to Video > - Kling-O3 Reference to Video (kling-o3-reference-to-video) generates new videos based on the style and motion characteristics of a reference video, powered by the Kling AI kling-v3-omni model - The reference video serves as a feature reference (not direct editing), and can be combined with text, reference images, and elements for creation - Sound effect generation is not supported when video input is provided (sound is forced off) - 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/kling/kling-o3-reference-to-video.json post /v1/videos/generations openapi: 3.1.0 info: title: kling-o3-reference-to-video API description: Create video reference tasks using AI models 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 APIs paths: /v1/videos/generations: post: tags: - Video Generation summary: kling-o3-reference-to-video API description: >- - Kling-O3 Reference to Video (kling-o3-reference-to-video) generates new videos based on the style and motion characteristics of a reference video, powered by the Kling AI kling-v3-omni model - The reference video serves as a feature reference (not direct editing), and can be combined with text, reference images, and elements for creation - Sound effect generation is not supported when video input is provided (sound is forced off) - 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: createVideoGeneration requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/VideoGenerationRequest' examples: basic: summary: Basic Video Reference value: model: kling-o3-reference-to-video prompt: Keep the same motion style, change to a snowy background video_url: https://example.com/reference.mp4 duration: 5 aspect_ratio: '16:9' quality: 720p pro_no_sound: summary: High Quality + No Original Sound value: model: kling-o3-reference-to-video prompt: >- Following the rhythm of the reference video, generate a street dance video video_url: https://example.com/dance.mp4 duration: 10 aspect_ratio: '9:16' quality: 1080p keep_original_sound: false with_reference_and_element: summary: Video Reference + Reference Image + Element value: model: kling-o3-reference-to-video prompt: <<>> walking in the same scene style video_url: https://example.com/reference.mp4 image_urls: - https://example.com/style.jpg duration: 8 quality: 1080p model_params: element_list: - element_id: "789012" 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 is 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: kling-o3-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: - kling-o3-reference-to-video default: kling-o3-reference-to-video example: kling-o3-reference-to-video prompt: type: string description: >- Text prompt, max 2500 characters **Reference syntax:** You can reference elements, images, and videos in the prompt using `<<>>` syntax, for example: `<<>> walking in the scene style of <<>>` example: Keep the same motion style, change to a snowy background maxLength: 2500 video_url: type: string description: |- Reference video URL **Video format requirements:** - Format: MP4 / MOV - Size: <= 200MB - Duration: >= 3 seconds - Dimensions: width and height 720px ~ 2160px - Frame rate: 24fps ~ 60fps format: uri example: https://example.com/reference.mp4 keep_original_sound: type: boolean description: |- Whether to keep original sound from reference video **Options:** - `true`: Keep the original video sound (default) - `false`: Do not keep the original video sound default: true example: true image_urls: type: array description: >- Reference image URL array (style/scene reference) **Constraint:** Image count + element count <= 4 when video is provided items: type: string format: uri example: - https://example.com/style.jpg duration: type: integer description: >- Video duration (seconds), range 3~10 **Note:** Shorter than the 15-second maximum for text-to-video/image-to-video, max supported duration is 10 seconds minimum: 3 maximum: 10 default: 5 example: 5 aspect_ratio: type: string description: |- Video aspect ratio **Options:** - `16:9`: Landscape video - `9:16`: Portrait video - `1:1`: Square video enum: - '16:9' - '9:16' - '1:1' example: '16:9' quality: type: string description: |- Resolution tier **Options:** - `720p`: Standard 720P - `1080p`: High quality 1080P enum: - 720p - 1080p default: 720p example: 720p model_params: type: object description: Advanced parameters properties: element_list: type: array description: >- Element library list. Video character elements not supported (only multi-image elements supported) **Constraint:** Image count + element count <= 4 when video is provided items: type: object properties: element_id: type: string description: Element ID watermark_info: type: object description: Watermark configuration properties: enabled: type: boolean description: Whether to enable watermark callback_url: type: string description: >- HTTPS callback URL for task completion **Callback Timing:** - Triggered when task is completed, failed, or cancelled - Sent after billing confirmation **Security Restrictions:** - HTTPS protocol only - Internal 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 - Maximum `3` retries after failure (at `1`/`2`/`4` seconds after failure) - Callback response format is consistent with task query API - 2xx status code is considered successful, other codes trigger 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: Actual model name used example: kling-o3-reference-to-video object: type: string enum: - video.generation.task description: Task type 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: Task output type 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: 300 video_duration: type: integer description: Video duration (seconds) example: 9 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_call credits_reserved: type: number description: Estimated credits consumed minimum: 0 example: 7 user_group: type: string description: User group category example: default 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 ``` ```` > ## 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-1756817821-4x3rx6ny 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: 1756817821 id: type: string description: Task ID example: task-unified-1756817821-4x3rx6ny model: type: string description: Model used example: gemini-3.1-flash-image-preview object: type: string description: Task type enum: - image.generation.task - video.generation.task - audio.generation.task example: image.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/image.jpg 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: image 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 ``` ````