RTCRtpEncodingParameters.scaleResolutionDownBy

在此页

句法
规范
浏览器兼容性
相关话题

RTCRtpEncodingParameters dictionary's scaleResolutionDownBy property can be used to specify a factor by which to reduce the size of a video track during encoding.

This property is only available for tracks whose kind is 视频 .

句法

rtpEncodingParameters.scaleResolutionDownBy = scalingFactor;
rtpEncodingParameters = {
  scaleResolutionDownBy: scalingFactor
};

值

A double-precison floating-point number specifying the amount by which to reduce the size of the video during encoding. The default value, 1.0, means that the video will be encoded at its original size. A value of 2.0 would reduce the size of the video by a factor of 2 both horizontally and vertically, resulting in a video 25% the original size.

A value less than 1.0 would cause the video to get larger rather than smaller, which is not the intent of this property. Therefore, specifying a value less than 1.0 is not permitted and will cause a RangeError exception to be thrown by RTCPeerConnection.addTransceiver() or RTCRtpSender.setParameters() .

规范

规范	状态	注释
WebRTC 1.0: Real-time Communication Between Browsers The definition of 'RTCRtpEncodingParameters.scaleResolutionDownBy' in that specification.	候选推荐	初始定义。

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`scaleResolutionDownBy`	Chrome 74	Edge No	Firefox 46	IE No	Opera ?	Safari ?	WebView Android 74	Chrome Android 74	Firefox Android 46	Opera Android ?	Safari iOS ?	Samsung Internet Android 11.0

图例

完整支持
不支持
兼容性未知 ?

元数据

最后修改： Mar 18, 2019

在此页

句法

值

规范

浏览器兼容性

图例

相关话题