> ## Documentation Index > Fetch the complete documentation index at: https://docs.modellix.ai/llms.txt > Use this file to discover all available pages before exploring further. # SkyReels Single-Actor Avatar > **[Core Function]** SkyReels Single-Actor Avatar (audio-to-video) drives a talking-avatar video from a single portrait image and one audio track. **[Strengths]** Lip-synced single-speaker talking-head video generated from an image plus audio. **[Best For]** Virtual presenters, single-speaker dubbing, and talking avatars. **[Limitations]** Do NOT use this for multi-speaker scenes (use the multi-actor flow) or when you only have text. It requires first_frame_image and exactly one audio segment (<=200s). mode=std outputs 720p, mode=pro outputs 1080p. **[Routing]** Provide a portrait first_frame_image and one audio URL in audios; choose mode=pro for 1080p output. ## OpenAPI ````yaml /model-api/skywork/skyreels-i2v.json post /skywork/single-actor-avatar openapi: 3.1.0 info: description: >- The image-to-video models API from SkyReels (Skywork). Includes keyframe image-to-video, multi-subject reference-to-video, and audio-driven talking-avatar generation. Tasks are asynchronous: submit, then poll the task endpoint for the result. version: 1.0.0 contact: name: Modellix Support email: support@modellix.ai title: SkyReels Image-to-Video Models API servers: - url: https://api.modellix.ai/api/v1 description: The image-to-video models API from SkyReels (Skywork). security: - bearerAuth: [] paths: /skywork/single-actor-avatar: post: summary: SkyReels Single-Actor Avatar description: >- **[Core Function]** SkyReels Single-Actor Avatar (audio-to-video) drives a talking-avatar video from a single portrait image and one audio track. **[Strengths]** Lip-synced single-speaker talking-head video generated from an image plus audio. **[Best For]** Virtual presenters, single-speaker dubbing, and talking avatars. **[Limitations]** Do NOT use this for multi-speaker scenes (use the multi-actor flow) or when you only have text. It requires first_frame_image and exactly one audio segment (<=200s). mode=std outputs 720p, mode=pro outputs 1080p. **[Routing]** Provide a portrait first_frame_image and one audio URL in audios; choose mode=pro for 1080p output. operationId: singleActorAvatarAsync requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/SingleActorAvatarRequest' examples: basic: summary: Portrait + audio value: prompt: A woman passionately singing into a microphone in a studio first_frame_image: https://example.com/portrait.png audios: - https://example.com/voice.mp3 mode: std responses: '200': description: Task submitted successfully content: application/json: schema: $ref: '#/components/schemas/AsyncTaskResponse' example: code: 0 message: success data: status: pending task_id: task-skyreels-avatar-001 model_id: skyreels/single-actor-avatar get_result: method: GET url: >- https://api.modellix.ai/api/v1/tasks/task-skyreels-avatar-001 '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '429': $ref: '#/components/responses/TooManyRequests' '500': $ref: '#/components/responses/InternalServerError' components: schemas: SingleActorAvatarRequest: type: object required: - prompt - first_frame_image - audios description: SkyReels single-actor talking-avatar request (image + one audio track). properties: prompt: type: string minLength: 1 description: Text description of the video (max 512 tokens). example: A woman passionately singing into a microphone in a studio first_frame_image: type: string minLength: 1 description: Portrait image URL (jpg/jpeg/png/gif/bmp). example: https://example.com/portrait.png audios: type: array minItems: 1 maxItems: 1 description: Exactly one audio URL (mp3/wav, each segment <=200s). items: type: string minLength: 1 example: - https://example.com/voice.mp3 mode: type: string enum: - std - pro default: std description: 'Output mode: std returns 720p, pro returns 1080p.' example: std AsyncTaskResponse: type: object required: - code - message - data properties: code: type: integer description: Response code, 0 indicates success example: 0 message: type: string description: Response message example: success data: type: object required: - status - task_id - model_id properties: status: type: string enum: - pending - processing description: Task status example: pending task_id: type: string description: Unique task identifier for polling example: task-abc123 model_id: type: string description: Model ID in `provider/model` format example: skyreels/skyreels-i2v get_result: type: object description: API information to query the task result properties: method: type: string example: GET url: type: string example: https://api.modellix.ai/api/v1/tasks/task-abc123 description: Detailed data about the submitted asynchronous task. ErrorResponse: type: object required: - code - message properties: code: type: integer example: 400 message: type: string example: 'Invalid parameters: parameter ''prompt'' is required' responses: BadRequest: description: Invalid request parameters content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 400 message: 'Invalid parameters: parameter ''prompt'' is required' Unauthorized: description: Unauthorized - Invalid or missing API Key content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 401 message: 'Authentication failed: invalid API key' TooManyRequests: description: Too many requests - Rate limit exceeded headers: X-RateLimit-Limit: description: Maximum requests per minute schema: type: integer example: 100 X-RateLimit-Remaining: description: Remaining quota in current window schema: type: integer example: 0 X-RateLimit-Reset: description: Rate limit window reset time (Unix timestamp) schema: type: integer example: 1704067260 content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 429 message: >- Rate limit exceeded: 100 requests per minute, retry after 60 seconds InternalServerError: description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 500 message: Internal server error securitySchemes: bearerAuth: type: http scheme: bearer description: 'API Key authentication. Format: `Bearer YOUR_API_KEY`.' ````