Stability AI Stable Video Diffusion API

openapi: 3.1.0
info:
  title: Stability AI Stable Video Diffusion API
  description: >-
    The Stability AI Stable Video Diffusion API enables developers to generate
    short video clips from a single input image. Powered by the Stable Video
    Diffusion model, the API produces smooth animated sequences that bring static
    images to life with realistic motion. This is useful for creating product
    animations, visual effects previews, and dynamic content from existing image
    assets. The API uses an asynchronous workflow where a generation is started
    and then polled for completion.
  version: 'v2beta'
  contact:
    name: Stability AI Support
    url: https://platform.stability.ai
  termsOfService: https://stability.ai/terms-of-service
externalDocs:
  description: Stability AI Video Documentation
  url: https://platform.stability.ai/docs/getting-started/stable-video-diffusion
servers:
  - url: https://api.stability.ai
    description: Production Server
tags:
  - name: Image to Video
    description: >-
      Generate short video clips from a single input image using the Stable
      Video Diffusion model. The API uses an asynchronous start-and-poll pattern.
security:
  - bearerAuth: []
paths:
  /v2beta/image-to-video:
    post:
      operationId: startImageToVideo
      summary: Start an image-to-video generation
      description: >-
        Initiates an asynchronous video generation from a single input image.
        Returns a generation ID that can be used to poll for the completed video.
        The model produces a short animated sequence with realistic motion derived
        from the input image. Parameters control the strength of motion and
        conditioning.
      tags:
        - Image to Video
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              $ref: '#/components/schemas/ImageToVideoRequest'
      responses:
        '200':
          description: Video generation started successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AsyncGenerationResponse'
        '400':
          description: Bad request due to invalid parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized due to missing or invalid API key
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Rate limit exceeded
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /v2beta/image-to-video/result/{id}:
    get:
      operationId: getImageToVideoResult
      summary: Get the result of a video generation
      description: >-
        Polls for the result of an asynchronous image-to-video generation.
        Returns the generated video when processing is complete or a status
        indicating the generation is still in progress.
      tags:
        - Image to Video
      parameters:
        - $ref: '#/components/parameters/generationId'
      responses:
        '200':
          description: Video generation is complete
          content:
            video/mp4:
              schema:
                type: string
                format: binary
            application/json:
              schema:
                $ref: '#/components/schemas/VideoGenerationResponse'
        '202':
          description: Generation is still in progress
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AsyncGenerationResponse'
        '401':
          description: Unauthorized due to missing or invalid API key
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: Generation ID not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        API key authentication. Pass your Stability AI API key as a Bearer token
        in the Authorization header.
  parameters:
    generationId:
      name: id
      in: path
      required: true
      schema:
        type: string
      description: >-
        The unique identifier of the asynchronous generation to poll for results.
  schemas:
    ImageToVideoRequest:
      type: object
      required:
        - image
      properties:
        image:
          type: string
          format: binary
          description: >-
            The source image to animate. The image should contain a clear subject
            with a stable composition suitable for animation. Supported
            resolutions include 1024x576, 576x1024, and 768x768.
        seed:
          type: integer
          minimum: 0
          maximum: 4294967294
          default: 0
          description: >-
            A value to control randomness in the video generation.
        cfg_scale:
          type: number
          minimum: 0
          maximum: 10
          default: 1.8
          description: >-
            Controls how closely the video follows the conditioning from the
            input image. Higher values produce videos more faithful to the
            input but may reduce motion quality.
        motion_bucket_id:
          type: integer
          minimum: 1
          maximum: 255
          default: 127
          description: >-
            Controls the amount of motion in the generated video. Lower values
            produce less motion, higher values produce more dynamic motion.
    VideoGenerationResponse:
      type: object
      properties:
        video:
          type: string
          description: >-
            Base64-encoded video data when Accept header is set to
            application/json.
        finish_reason:
          type: string
          enum:
            - SUCCESS
            - CONTENT_FILTERED
          description: >-
            The reason the generation finished.
        seed:
          type: integer
          description: >-
            The seed used for generation.
    AsyncGenerationResponse:
      type: object
      properties:
        id:
          type: string
          description: >-
            The unique generation ID used to poll for results.
        status:
          type: string
          description: >-
            The current status of the generation.
    ErrorResponse:
      type: object
      properties:
        id:
          type: string
          description: >-
            A unique identifier for the error instance.
        name:
          type: string
          description: >-
            The error type name.
        message:
          type: string
          description: >-
            A human-readable description of the error.