Web/API/MediaTrackSettings/sampleRate

The MediaTrackSettings dictionary's sampleRate property is an integer indicating how many audio samples per second the MediaStreamTrack is currently configured for. This lets you determine what value was selected to comply with your specified constraints for this property's value as described in the MediaTrackConstraints.sampleRate property you provided when calling either getUserMedia() or MediaStreamTrack.applyConstraints().

If needed, you can determine whether or not this constraint is supported by checking the value of MediaTrackSupportedConstraints.sampleRate 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 sampleRate = MediaTrackSettings.sampleRate;

Value

An integer value indicating how many samples each second of audio data includes. Common values include 44,100 (standard CD audio), 48,000 (standard digital audio), 96,000 (commonly used in audio mastering and post-production), and 192,000 (used for high-resolution audio in professional recording and mastering sessions). However, lower values are often used to reduce bandwidth requirements; 8,000 samples per second is adequate for comprehensible albeit imperfect human speech, and both 11,025 FPS and 22,050 FPS are often used for low-bandwidth, reduced quality sound and music.

Example

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

Specifications

Specification	Status	Comment
Media Capture and StreamsThe definition of 'sampleRate' in that specification.	Candidate Recommendation	Initial specification.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`sampleRate`	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera No support No	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android No support No	Safari iOS ?	Samsung Internet Android No support No

Legend

No support: No support
Compatibility unknown: Compatibility unknown