Stop/Close webcam which is opened by navigator.getUserMedia

问题

I opened a webcam by using the following JavaScript code: navigator.getUserMedia

Is there any JavaScript code to stop or close the webcam? Thanks everyone.

回答1:

EDIT

Since this answer has been originally posted the browser API has changed. .stop() is no longer available on the stream that gets passed to the callback. The developer will have to access the tracks that make up the stream (audio or video) and stop each of them individually.

More info here: https://developers.google.com/web/updates/2015/07/mediastream-deprecations?hl=en#stop-ended-and-active

Example (from the link above):

stream.getTracks().forEach(function(track) {
  track.stop();
});

Browser support may differ.

Original answer

navigator.getUserMedia provides you with a stream in the success callback, you can call .stop() on that stream to stop the recording (at least in Chrome, seems FF doesn't like it)

回答2:

You can call "stop" over MediaStream object which is going to be obsolete; new proposal is to release media tracks by calling "stop" over each media track:

mediaStream.stop();

// or
mediaStream.getTracks()[0].stop();
mediaStream.getTracks()[1].stop();

---

Updated at Nov 03, 2015 ---- 10:34:24 AM

Here is a cross-browser stream.stop hack:

var MediaStream = window.MediaStream;

if (typeof MediaStream === 'undefined' && typeof webkitMediaStream !== 'undefined') {
    MediaStream = webkitMediaStream;
}

/*global MediaStream:true */
if (typeof MediaStream !== 'undefined' && !('stop' in MediaStream.prototype)) {
    MediaStream.prototype.stop = function() {
        this.getTracks().forEach(function(track) {
            track.stop();
        });
    };
}

回答3:

Don't use stream.stop(), it's deprecated

MediaStream Deprecations

Use stream.getTracks().forEach(track => track.stop())

回答4:

Starting Webcam Video with different browsers

For Opera 12

window.navigator.getUserMedia(param, function(stream) {
                            video.src =window.URL.createObjectURL(stream);
                        }, videoError );

For Firefox Nightly 18.0

window.navigator.mozGetUserMedia(param, function(stream) {
                            video.mozSrcObject = stream;
                        }, videoError );

For Chrome 22

window.navigator.webkitGetUserMedia(param, function(stream) {
                            video.src =window.webkitURL.createObjectURL(stream);
                        },  videoError );

Stopping Webcam Video with different browsers

For Opera 12

video.pause();
video.src=null;

For Firefox Nightly 18.0

video.pause();
video.mozSrcObject=null;

For Chrome 22

video.pause();
video.src="";

With this the Webcam light go down everytime...

回答5:

FF, Chrome and Opera has started exposing getUserMedia via navigator.mediaDevices as standard now (Might change :)

online demo

navigator.mediaDevices.getUserMedia({audio:true,video:true})
    .then(stream => {
        window.localStream = stream;
    })
    .catch( (err) =>{
        console.log(err);
    });
// later you can do below
// stop both video and audio
localStream.getTracks().forEach( (track) => {
track.stop();
});
// stop only audio
localStream.getAudioTracks()[0].stop();
// stop only video
localStream.getVideoTracks()[0].stop();

回答6:

You can end the stream directly using the stream object returned in the success handler to getUserMedia. e.g.

localMediaStream.stop()

video.src="" or null would just remove the source from video tag. It wont release the hardware.

回答7:

Try bellow method

var mediaStream = null;
    navigator.getUserMedia(
        {
            audio: true,
            video: true
        },
        function (stream) {
            mediaStream = stream;
            mediaStream.stop = function () {
                this.getAudioTracks().forEach(function (track) {
                    track.stop();
                });
                this.getVideoTracks().forEach(function (track) { //in case... :)
                    track.stop();
                });
            };
            /*
             * Rest of your code.....
             * */
        });

    /*
    * somewhere insdie your code you call
    * */
    mediaStream.stop();

回答8:

If the .stop() is deprecated then I don't think we should re-add it like @MuazKhan dose. It's a reason as to why things get deprecated and should not be used anymore. Just create a helper function instead... Here is a more es6 version

function stopStream (stream) {
    for (let track of stream.getTracks()) { 
        track.stop()
    }
}

回答9:

Since you need the tracks to close the streaming, and you need the stream boject to get to the tracks, the code I have used with the help of the Muaz Khan's answer above is as follows:

if (navigator.getUserMedia) {
    navigator.getUserMedia(constraints, function (stream) {
        videoEl.src = stream;
        videoEl.play();
        document.getElementById('close').addEventListener('click', function () {
            stopStream(stream);
        });
    }, errBack);

function stopStream(stream) {
console.log('stop called');
stream.getVideoTracks().forEach(function (track) {
    track.stop();
});

Of course this will close all the active video tracks. If you have multiple, you should select accordingly.

回答10:

Suppose we have streaming in video tag and id is video - <video id="video"></video> then we should have following code -

var videoEl = document.getElementById('video');
// now get the steam 
stream = videoEl.srcObject;
// now get all tracks
tracks = stream.getTracks();
// now close each track by having forEach loop
tracks.forEach(function(track) {
   // stopping every track
   track.stop();
});

// assign null to srcObject of video videoEl.srcObject = null;

回答11:

You need to stop all tracks (from webcam, microphone):

localStream.getTracks().forEach(track => track.stop());

回答12:

Using .stop() on the stream works on chrome when connected via http. It does not work when using ssl (https).

回答13:

Please check this: https://jsfiddle.net/wazb1jks/3/

navigator.getUserMedia(mediaConstraints, function(stream) {
    window.streamReference = stream;
}, onMediaError);

Stop Recording

function stopStream() {
    if (!window.streamReference) return;

    window.streamReference.getAudioTracks().forEach(function(track) {
        track.stop();
    });

    window.streamReference.getVideoTracks().forEach(function(track) {
        track.stop();
    });

    window.streamReference = null;
}

回答14:

The following code worked for me:

public vidOff() {

      let stream = this.video.nativeElement.srcObject;
      let tracks = stream.getTracks();

      tracks.forEach(function (track) {
          track.stop();
      });

      this.video.nativeElement.srcObject = null;
      this.video.nativeElement.stop();
  }

回答15:

Have a reference of stream form successHandle

var streamRef;

var handleVideo = function (stream) {
    streamRef = stream;
}

//this will stop video and audio both track
streamRef.getTracks().map(function (val) {
    val.stop();
});

来源：https://stackoverflow.com/questions/11642926/stop-close-webcam-which-is-opened-by-navigator-getusermedia