> ## Documentation Index
> Fetch the complete documentation index at: https://docs.aihubmax.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Veo3.1 视频延长

> - VEO 3.1 视频延长模型，基于已有视频生成延续片段
 - 固定延长 7 秒，支持生成配套音频
- 异步处理模式，使用返回的任务ID [进行查询](/pages/zh/api-manual/task-management/get-task-detail)
- 生成的视频链接，有效期为24小时，请尽快保存




## OpenAPI

````yaml openapi/zh/veo-3.1-extend.json POST /v1/videos/generations
openapi: 3.1.0
info:
  title: Veo3.1 视频延长
  version: '1.0'
servers:
  - url: https://api.aihubmax.com
security:
  - BearerAuth: []
paths:
  /v1/videos/generations:
    post:
      tags:
        - Video > Veo3.1
      summary: Veo3.1 视频延长
      description: >
        - VEO 3.1 视频延长模型，基于已有视频生成延续片段
         - 固定延长 7 秒，支持生成配套音频
        - 异步处理模式，使用返回的任务ID
        [进行查询](/pages/zh/api-manual/task-management/get-task-detail)

        - 生成的视频链接，有效期为24小时，请尽快保存
      operationId: veo-3.1-extend
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Veo31ExtendGenRequest'
            examples:
              standard_video_extension_with_audio:
                summary: Standard video extension with audio
                value:
                  model: veo-3.1-extend
                  prompt: The camera continues to pan across the landscape
                  video_url: https://example.com/input-video.mp4
                  aspect_ratio: '16:9'
                  generate_audio: true
              fast_mode_extension_without_audio:
                summary: Fast mode extension without audio
                value:
                  model: veo-3.1-extend-fast
                  prompt: The character walks further into the forest
                  video_url: https://example.com/scene.mp4
                  generate_audio: false
              extension_with_advanced_options:
                summary: Extension with advanced options
                value:
                  model: veo-3.1-extend
                  prompt: The bird takes flight from the branch
                  video_url: https://example.com/bird-clip.mp4
                  negative_prompt: blurry, low quality
                  auto_fix: true
                  safety_tolerance: 3
      responses:
        '200':
          $ref: '#/components/responses/TaskCreated'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '422':
          $ref: '#/components/responses/UnprocessableEntity'
        '429':
          $ref: '#/components/responses/TooManyRequests'
        '500':
          $ref: '#/components/responses/InternalServerError'
        '503':
          $ref: '#/components/responses/ServiceUnavailable'
components:
  schemas:
    Veo31ExtendGenRequest:
      type: object
      required:
        - model
        - prompt
        - video_url
      properties:
        model:
          description: |-
            `veo-3.1-extend`：标准版
            `veo-3.1-extend-fast`：快速版
          examples:
            - veo-3.1-extend
            - veo-3.1-extend-fast
          type: string
          default: veo-3.1-extend
        prompt:
          description: |
            文本提示词，描述视频延展后的内容走向

            **说明：**
            - 支持中英文
            - 描述延续的动作、场景变化等
          type: string
          example: The camera continues to pan across the landscape
        video_url:
          description: |
            输入视频的公开 URL

            **说明：**
            - 必须为公开可访问的 URL
            - 输入视频需为 `720p` 或 `1080p`
            - 输入视频宽高比需为 `16:9` 或 `9:16`
            - 系统将从该视频末尾继续生成 7 秒内容
          type: string
          example: https://example.com/input-video.mp4
        aspect_ratio:
          default: '16:9'
          description: |
            输出视频宽高比

            **可选值：**
            - `16:9` — 横屏（默认）
            - `9:16` — 竖屏
          type: string
          example: '16:9'
        generate_audio:
          default: true
          description: |
            是否生成配套音频

            **说明：**
            - 默认开启
          type: boolean
          example: true
        auto_fix:
          anyOf:
            - type: boolean
            - type: 'null'
          default: null
          description: |-
            自动修复提示词（默认 true）

            > 非必须不要传这个参数。
          x-advanced: true
          example: true
        safety_tolerance:
          anyOf:
            - maximum: 6
              minimum: 1
              type: integer
            - type: 'null'
          default: null
          description: |-
            内容安全等级，1 最严格

            > 非必须不要传这个参数。
          x-advanced: true
          example: 3
        negative_prompt:
          anyOf:
            - type: string
            - type: 'null'
          default: null
          description: |-
            负面提示词，描述不希望出现的元素

            **说明：**
            - 用逗号分隔多个关键词


            > 非必须不要传这个参数。
          x-advanced: true
          example: blurry, low quality, watermark
        seed:
          anyOf:
            - type: integer
            - type: 'null'
          default: null
          description: |-
            随机种子

            **说明：**
            - 设置固定值可复现生成结果
            - 不传则随机


            > 非必须不要传这个参数。
          x-advanced: true
          example: 42
    TaskResponse:
      type: object
      properties:
        created:
          type: integer
          description: 任务创建时间戳
          example: 1757165031
        id:
          type: string
          description: 任务ID
          example: task-unified-1757165031-uyujaw3d
        model:
          type: string
          description: 实际使用的模型名称
        object:
          type: string
          description: 任务的具体类型
          enum:
            - video.generation.task
        progress:
          type: integer
          description: 任务进度百分比 (0-100)
          minimum: 0
          maximum: 100
          example: 0
        status:
          type: string
          description: 任务状态
          enum:
            - pending
            - processing
            - completed
            - failed
          example: pending
        task_info:
          type: object
          description: 异步任务信息
          properties:
            can_cancel:
              type: boolean
              description: 任务是否可以取消
              example: true
            estimated_time:
              type: integer
              description: 预计完成时间（秒）
              example: 45
        type:
          type: string
          description: 任务的输出类型
          enum:
            - video
          example: video
    ErrorResponse400:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
              example: 请求格式错误
            type:
              type: string
              example: invalid_request_error
    ErrorResponse401:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
              example: API密钥无效
            type:
              type: string
              example: authentication_error
    ErrorResponse402:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
              example: 账户余额不足
            type:
              type: string
              example: insufficient_quota
    ErrorResponse422:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
              example: 参数校验失败
            type:
              type: string
              example: validation_error
    ErrorResponse429:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
              example: 请求频率超限
            type:
              type: string
              example: rate_limit_error
    ErrorResponse500:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
              example: 服务器内部错误
            type:
              type: string
              example: server_error
    ErrorResponse503:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
              example: 服务暂不可用，请稍后重试
            type:
              type: string
              example: service_unavailable
  responses:
    TaskCreated:
      description: 任务创建成功
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/TaskResponse'
    BadRequest:
      description: 请求格式错误
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse400'
    Unauthorized:
      description: 未授权
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse401'
    PaymentRequired:
      description: 余额不足
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse402'
    UnprocessableEntity:
      description: 参数校验失败
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse422'
    TooManyRequests:
      description: 请求频率超限
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse429'
    InternalServerError:
      description: 服务器内部错误
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse500'
    ServiceUnavailable:
      description: 服务暂不可用
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse503'
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: |
        ## 所有接口均需要使用Bearer Token进行认证 ##

        使用时在请求头中添加：

        `Authorization: Bearer YOUR_API_KEY`

````