# SimulcastStreamConfig (/zh-CN/api-reference/rtc/harmonyos/class-simulcaststreamconfig)

> For AI agents: see the complete documentation index at [llms.txt](/llms.txt).

<a id="class_simulcaststreamconfig__prototype"></a>

```ts
export class SimulcastStreamConfig {
  public dimensions: VideoDimensions;

  public bitrate: number = -1;

  public framerate: number = 5;
  constructor() {
    this.dimensions = new VideoDimensions(-1, -1);
  }
}
```

<a id="class_simulcaststreamconfig__parameters"></a>

##

<ParameterList>
<a id="dimensions"></a>
<Parameter name="dimensions">

视频尺寸。默认值为视频大流的 50%。

</Parameter>
<a id="bitrate"></a>
<Parameter name="bitrate">

视频码率 (Kbps)。该参数无需设置，SDK 会根据你设定的视频分辨率和帧率自动匹配最合适的码率。

</Parameter>
<a id="framerate"></a>
<Parameter name="framerate">

视频帧率 (fps)。默认值为 5。

</Parameter>
</ParameterList>