MediaTrackSettings.latency

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MediaTrackSettings dictionary's latency property is a double-precision floating-point number indicating the estimated latency (specified in seconds) of the MediaStreamTrack as currently configured. This lets you determine what value was selected to comply with your specified constraints for this property's value as described in the MediaTrackConstraints.latency property you provided when calling either getUserMedia() or MediaStreamTrack.applyConstraints() .

This is, of course, an approximation, since latency can vary for many reasons including CPU, transmission, and storage overhead.

If needed, you can determine whether or not this constraint is supported by checking the value of MediaTrackSupportedConstraints.latency as returned by a call to MediaDevices.getSupportedConstraints() . However, typically this is unnecessary since browsers will simply ignore any constraints they're unfamiliar with.

因为 RTP doesn't include this information, tracks associated with a WebRTC RTCPeerConnection will never include this property.

var latency = MediaTrackSettings.latency;

A double-precision floating-point number indicating the estimated latency, in seconds, of the audio track as currently configured.

规范	状态	注释
媒体捕获和流 The definition of 'latency' in that specification.	候选推荐	最初的规范。

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