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MediaTrackSettings.latency

The 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.

Syntax

var latency = MediaTrackSettings.latency;

Value

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

Example

See "Example: Constraint exerciser" in Capabilities, constraints, and settings for an example.

Specifications

Specification Status Comment
Media Capture and Streams
The definition of 'latency' in that specification.
Editor's Draft Initial specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) No support No support (Yes) ?
Feature Android Android Webview Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support ? (Yes) No support No support ? ? (Yes)

See also

Document Tags and Contributors

 Contributors to this page: Sheppy
 Last updated by: Sheppy,