---
title: "RealtimeClientEventInputAudioBufferAppend"
url: "https://kongair.terwilligar.com/apis/openai-api-2-3-0/versions/ea92d048-c746-4ead-a6a8-da28d93137d1/schemas/RealtimeClientEventInputAudioBufferAppend"
---

> Full API specification: https://kongair.terwilligar.com/apis/openai-api-2-3-0/versions/ea92d048-c746-4ead-a6a8-da28d93137d1.md

# RealtimeClientEventInputAudioBufferAppend

Send this event to append audio bytes to the input audio buffer. The audio buffer is temporary storage you can write to and later commit. In Server VAD mode, the audio buffer is used to detect speech and the server will decide when to commit. When Server VAD is disabled, you must commit the audio buffer manually. The client may choose how much audio to place in each event up to a maximum of 15 MiB, for example streaming smaller chunks from the client may allow the VAD to be more responsive. Unlike made other client events, the server will not send a confirmation response to this event.

## OpenAPI definition

```yaml
openapi: 3.0.0
info:
  title: OpenAI API
  version: 2.3.0
servers:
  - url: https://api.openai.com/v1
components:
  schemas:
    RealtimeClientEventInputAudioBufferAppend:
      type: object
      description: >
        Send this event to append audio bytes to the input audio buffer. The
        audio 

        buffer is temporary storage you can write to and later commit. In Server
        VAD 

        mode, the audio buffer is used to detect speech and the server will
        decide 

        when to commit. When Server VAD is disabled, you must commit the audio
        buffer

        manually.


        The client may choose how much audio to place in each event up to a
        maximum 

        of 15 MiB, for example streaming smaller chunks from the client may
        allow the 

        VAD to be more responsive. Unlike made other client events, the server
        will 

        not send a confirmation response to this event.
      properties:
        event_id:
          type: string
          description: Optional client-generated ID used to identify this event.
        type:
          type: string
          enum:
            - input_audio_buffer.append
          description: The event type, must be `input_audio_buffer.append`.
          x-stainless-const: true
        audio:
          type: string
          description: >
            Base64-encoded audio bytes. This must be in the format specified by
            the 

            `input_audio_format` field in the session configuration.
      required:
        - type
        - audio
      x-oaiMeta:
        name: input_audio_buffer.append
        group: realtime
        example: |
          {
              "event_id": "event_456",
              "type": "input_audio_buffer.append",
              "audio": "Base64EncodedAudioData"
          }
```