RTCRtpSendParameters.encodings

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RTCRtpSendParameters dictionary's encodings property is an RTCRtpEncodingParameters object providing configuration settings for the encoder being used for the RTCRtpSender 's track .

句法

sendParameters.encodings = encodingParameterList;
encodingParameterList = sendParameters.encodings;

值

An array of objects conforming to the RTCRtpEncodingParameters dictionary, each of which contains properties which provide settings and parameters that describe and configure the codec used for a single destination. Each object's properties are:

active: 若 true , the described encoding is currently actively being used. That is, for RTP senders, the encoding is currently being used to send data, while for receivers, the encoding is being used to decode received data. The default value is true .
codecPayloadType: When describing a codec for an RTCRtpSender , codecPayloadType is a single 8-bit byte (or octet) specifying the codec to use for sending the stream; the value matches one from the owning RTCRtpParameters 对象的 codecs parameter. This value can only be set when creating the transceiver; after that, this value is read only.
dtx: Only used for an RTCRtpSender whose kind is audio , this property indicates whether or not to use discontinuous transmission (a feature by which a phone is turned off or the microphone muted automatically in the absence of voice activity). The value is taken from the enumerated string type RTCDtxStatus .
maxBitrate: An unsigned long integer indicating the maximum number of bits per second to allow for this encoding. Other parameters may further constrain the bit rate, such as the value of maxFramerate or transport or physical network limitations.
maxFramerate
ptime
rid: DOMString which, if set, specifies an RTP stream ID ( RID ) to be sent using the RID header extension. This parameter cannot be modified using setParameters() . Its value can only be set when the transceiver is first created.
scaleResolutionDownBy: Only used for senders whose track's kind is 视频 , this is a double-precision floating-point value specifying a factor by which to scale down the video during encoding. The default value, 1.0, means that the sent video's size will be the same as the original. A value of 2.0 scales the video frames down by a factor of 2 in each dimension, resulting in a video 1/4 the size of the original. The value must not be less than 1.0 (you can't use this to scale the video up).

描述

In a connection in which there's only one remote peer, the encodings array will have just one object in it, describing the encoding to use when transmitting to that peer. For each peer you add the RTCRtpSender to, another entry is added to encodings to describe its configuration.

规范

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

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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
`encodings`	Chrome 69	Edge ≤79	Firefox No 不支持 No Firefox uses `RTCRtpParameters.encodings` 代替。	IE No	Opera ?	Safari ?	WebView Android 69	Chrome Android 69	Firefox Android No 不支持 No Firefox uses `RTCRtpParameters.encodings` 代替。	Opera Android ?	Safari iOS ?	Samsung Internet Android 10.0

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最后修改： Aug 27, 2020

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