The Media Capture and Streams API, often called the Media Streams API or simply MediaStream API, is an API related to WebRTC which provides support for streaming audio and video data. It provides the interfaces and methods for working with the streams and their constituent tracks, the constraints associated with data formats, the success and error callbacks when using the data asynchronously, and the events that are fired during the process.

Basic concepts

The API is based on the manipulation of a MediaStream object representing a flux of audio- or video-related data. See an example in Get the video.

A MediaStream consists of zero or more MediaStreamTrack objects, representing various audio or video tracks. Each MediaStreamTrack may have one or more channels. The channel represents the smallest unit of a media stream, such as an audio signal associated with a given speaker, like left or right in a stereo audio track.

MediaStream objects have a single input and a single output. A MediaStream object generated by getUserMedia() is called local, and has as its source input one of the user's cameras or microphones. A non-local MediaStream may be representing to a media element, like <video> or <audio>, a stream originating over the network, and obtained via the WebRTC RTCPeerConnection API, or a stream created using the Web Audio API MediaStreamAudioSourceNode.   The output of the MediaStream object is linked to a consumer. It can be a media elements, like <audio> or <video>,  the WebRTC RTCPeerConnection API or a Web Audio API MediaStreamAudioDestinationNode.

Reference

In these reference articles, you'll find the fundamental information you'll need to know about each of the interfaces and events that make up the Media Capture and Streams API.

Interfaces

Early versions of the Media Capture and Streams API specification included separate AudioStreamTrack and VideoStreamTrack interfaces—each based upon MediaStreamTrack—which represented streams of those types. These no longer exist, and you should update any existing code to instead use MediaStreamTrack directly.

Events

Guides and tutorials

The articles below provide additional guidance and how-to information that will help you learn to use the API, and how to perform specific tasks that you may wish to handle.

Capabilities, constraints, and settings
The twin concepts of constraints and capabilities let the browser and Web site or app exchange information about what constrainable properties the browser's implementation supports and what values it supports for each one. This article discusses capabilities and constraints, as well as media settings, and includes an example we call the Constraint Exerciser.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
Experimental
Chrome Full support YesEdge Full support YesFirefox Full support YesIE No support NoOpera No support NoSafari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android ? Opera Android No support NoSafari iOS ? Samsung Internet Android Full support Yes
MediaStreamChrome Full support 55Edge Full support YesFirefox Full support 44IE No support NoOpera Full support 42Safari No support NoWebView Android Full support 55Chrome Android Full support 55Edge Mobile Full support YesFirefox Android Full support 42Opera Android ? Safari iOS No support NoSamsung Internet Android Full support 6.0
activeChrome Full support YesEdge Full support 12Firefox Full support 52IE ? Opera ? Safari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 52Opera Android ? Safari iOS ? Samsung Internet Android Full support Yes
ended
Deprecated
Chrome No support ? — 54
Notes
No support ? — 54
Notes
Notes Deprecated in Chrome 52.
Edge ? Firefox No support NoIE ? Opera No support ? — 39Safari ? WebView Android No support ? — 54
Notes
No support ? — 54
Notes
Notes Deprecated in Chrome 52.
Chrome Android No support ? — 54
Notes
No support ? — 54
Notes
Notes Deprecated in Chrome 52.
Edge Mobile Full support YesFirefox Android No support NoOpera Android No support ? — 39Safari iOS ? Samsung Internet Android Full support Yes
idChrome No support ? — 54Edge Full support 12Firefox Full support 41IE ? Opera No support ? — 39Safari ? WebView Android No support ? — 54Chrome Android No support ? — 54Edge Mobile Full support YesFirefox Android Full support 41Opera Android No support ? — 39Safari iOS ? Samsung Internet Android Full support Yes
onaddtrackChrome Full support YesEdge Full support 12Firefox Full support 50IE ? Opera ? Safari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 50Opera Android ? Safari iOS ? Samsung Internet Android Full support Yes
onremovetrackChrome Full support YesEdge Full support 12Firefox No support NoIE ? Opera ? Safari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android Full support Yes
addTrackChrome Full support YesEdge Full support 12Firefox Full support 44IE ? Opera ? Safari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android Full support Yes
cloneChrome Full support YesEdge Full support 12Firefox Full support 48IE ? Opera ? Safari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 48Opera Android ? Safari iOS ? Samsung Internet Android Full support Yes
getAudioTracksChrome Full support YesEdge Full support 12Firefox ? IE ? Opera Full support YesSafari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android ? Opera Android ? Safari iOS ? Samsung Internet Android Full support Yes
getTrackByIdChrome Full support YesEdge Full support 12Firefox Full support 49IE No support NoOpera ? Safari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 49Opera Android ? Safari iOS ? Samsung Internet Android Full support Yes
getTracks
Experimental
Chrome Full support YesEdge Full support 12Firefox ? IE ? Opera Full support YesSafari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android ? Opera Android ? Safari iOS ? Samsung Internet Android Full support Yes
getVideoTracks
Experimental
Chrome Full support YesEdge Full support 12Firefox ? IE ? Opera Full support YesSafari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android ? Opera Android ? Safari iOS ? Samsung Internet Android Full support Yes
removeTrackChrome Full support YesEdge Full support 12Firefox ? IE ? Opera Full support YesSafari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile ? Firefox Android ? Opera Android ? Safari iOS ? Samsung Internet Android Full support Yes
label
Deprecated
Chrome No support ? — 54
Notes
No support ? — 54
Notes
Notes Deprecated in Chrome 45.
Edge ? Firefox ? IE No support NoOpera No support NoSafari ? WebView Android No support ? — 54
Notes
No support ? — 54
Notes
Notes Deprecated in Chrome 45.
Chrome Android No support ? — 54
Notes
No support ? — 54
Notes
Notes Deprecated in Chrome 45.
Edge Mobile ? Firefox Android ? Opera Android No support NoSafari iOS ? Samsung Internet Android Full support Yes
stop
Deprecated
Chrome No support NoEdge Full support 13Firefox ? IE No support NoOpera No support NoSafari ? WebView Android No support NoChrome Android No support NoEdge Mobile ? Firefox Android ? Opera Android No support NoSafari iOS ? Samsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
Deprecated. Not for use in new websites.
Deprecated. Not for use in new websites.
See implementation notes.
See implementation notes.

See also