openvidu-browser: stopping tracks even if no initialized by OpenVidu #107

mserve · 2018-08-13T08:35:09Z

If a session disconnects, MediaTracks are stopped regarding of their origin. This also stops tracks coming from custom sources, i.e. a track is given to OpenVidu.initPublisher's videoSource

This breaks playing in video tags which should be kept also after OpenVidu stops.

mserve · 2018-09-01T12:09:57Z

Hi, should this one be fixed with e456b5e? I got a conflict when merging the current master branch into my dev branch with #108

pabloFuente · 2018-09-01T12:11:21Z

This is already included in a patch in the development master branch of OpenVidu Browser library. Will be available in the next release.

pabloFuente · 2018-09-01T12:12:15Z

And yes, that is the commit that included the change.

mserve · 2018-09-01T12:13:52Z

Great, thank you! Then I'll test the next days and close both #107 and #108 👍

mserve · 2018-09-01T12:54:09Z

solved in current master ✔️

mserve · 2018-10-06T11:39:02Z

it seems that the solution in e456b5e did not solve this issue in all cases.

openvidu/openvidu-browser/src/OpenVidu/Stream.ts

Line 448 in 6e7d345

disposeMediaStream(): void {

is still closing my tracks initialized as custom stream.

Maybe #127 would provide a proper solution, using same logic as for disposeWebRtcPeer, at least for my application the

pabloFuente · 2018-10-08T07:43:46Z

Hi,

Could you provide a sample code replicating the issue? This way we can assure the problem still exists and if so properly fix it.

Thanks.

mserve · 2018-10-08T17:01:18Z

It's not that easy to provide a mininmal working example, this one is showing the basic approach without the "token" magic which is done via WebSockets communication with a NodeJS backend in my case.

Expected / wanted behaviour:

use getUserMedia to get the source
attach it to a
start sharing the video at some point isung initSession, initPublisher and so on
stop sharing by disconnecting using OpenViduSession.disconnect()
video keeps running
start over with 3.

That way, I establish sessions only when required, but people are "on standby" with granted consent.

Barebone example to show the issue (token magic missing!!!)

<!doctype <!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Issue 107</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <script src="openvidu/openvidu-browser/static/js/openvidu-browser-2.5.0.js"></script>
    <script>
        // OpenVidu
        var OV = new OpenVidu();
        var OpenViduSession;
        var publisher;
        var videoTrack;

        // Get user consent
        OV.getUserMedia({
            audioSource: false, // No audio source - not supported in screen share
            videoSource: 'screen', // The source of video. 
            publishAudio: false, // Whether you want to start publishing with your audio unmuted or not
            publishVideo: true, // Start unmuted
        }).then(mediaStream => {
            // Ready
            console.log("[OV] Media Stream ready.");
            videoTrack = mediaStream.getVideoTracks()[0];
            var video = document.createElement('video');
            video.srcObject = new MediaStream([this.videoTrack]);
            document.getElementById("main-video").appendChild(video);
            video.play();
        });


        function startSharing() {
            // Start session
            OpenViduSession = OV.initSession();

            // Set the token
            var token = getToken();

            // Init the publisher
            publisher = OV.initPublisher(undefined, {
                    audioSource: false, // No audio source - not supported in screen share
                    videoSource: videoTrack, // Use existing track to publish
                    mirror: false
                },
                (error) => { // Function to be executed when the method finishes
                    if (error) {
                        console.error('[OV] Error while initializing publisher: ', error);
                    } else {
                        console.log('[OV] Publisher successfully initialized');
                        OpenViduSession.connect().then(
                            function () {
                                OpenViduSession.publish(publisher);
                            });
                    }
                });
        }

        function stopSharing() {
            if (OpenViduSession)
                OpenViduSession.disconnect();

            // Clear session
            OpenViduSession = null;

        }

        function getToken() {
            //Magic to make a token
            return "TOKENTOKENTOKEN";
        }
    </script>
</head>

<body>
    <div id="main-video">

    </div>
    <button onclick="startSharing()">Start sharing</button>
    <button onclick="stopSharing()">Stop sharing</button>
</body>

</html>

On disconnect, a lots of events are triggered (https://openvidu.io/docs/how-do-i/leave-session/) and one of them (streamDestroyed) kills the tracks regardless of the origin by calling disposeMediaStream:

openvidu/openvidu-browser/src/OpenViduInternal/Events/StreamEvent.ts

Line 87 in d5958ec

this.stream.disposeMediaStream();

- hence the track is stopped.

Hope that helps to clarify the issue...

pabloFuente · 2018-10-09T13:30:24Z

Hi again,

Can you please confirm the following behaviour?:

If you subscribe to event streamDestroyed in your Publisher object, does it appears this INFO message in the browser's console?:

Calling default behavior upon 'streamDestroyed' event dispatched by 'Publisher'

You can do that with a snippet like this:

 publisher.on('streamDestroyed', event => console.log('Event streamDestroyed dispatched by Publisher');

If it does, then we will add a fix to avoid the disposal of custom MediaStream objects

pabloFuente · 2018-10-09T13:37:37Z

Either way, the behaviour you stated in your sample code is not really the expected use of OpenVidu session objects. All OpenVidu connections to the session (one for each user) should be kept alive as long as the video conference is running. To unpublish a stream you should simply call Session.unpublish(publisher). To sum up, your point number 3 shouldn't be launched more than one time, at least initSession and session.connect operations. And if you don't want a user to actually leave the videoconference, you shouldn't call session.disconnect.

Regards

mserve · 2018-12-15T17:02:46Z

sorry, didn't find the time to dig into this. After Christmas, I'll update to 2.7.0 and recheck this one

Agreed on your comment on the session, but those can be indeed different conferences - I do some kind of classroom m:n screensharing where students join a virtual room to show a screen on the digital whiteboard hosted by the teachers via browsers only, some kind of m:n approach. I want to keep the consent after the application got it once after login, so the screen share must keep "running". By not ending the sessions, i would have m*n sessions opened in the background :)

pabloFuente · 2019-06-06T15:42:25Z

Closing for inactivity

mserve · 2019-10-04T17:00:07Z

I refactored the working example to keep the session. Expected behaviour: after unpublishing, the video should still be running. I can confirm that

Calling default behavior upon 'streamDestroyed' event dispatched by 'Publisher'

shows up in the console and verified using the method you proposed. Below the new example using the openvidu demo servers to test "in real".

BTW: it would be good to state somewhere in the docs that getDisplayMedia has a quite strict same-origin-policy. It seems not to be possible to call getDisplayMedia from a script which is from a different origin. As you see below in the example, I also tried to load OpenVidu from jsdeliver and this leads to

Object { name: "SCREEN_CAPTURE_DENIED", message: "AbortError: Starting video failed" }

<!doctype html>
<html>

<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Issue 107</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <script src="openvidu/openvidu-browser/static/js/openvidu-browser-2.11.0.js"></script>
    <!-- <script src="https://cdn.jsdelivr.net/npm/[email protected]/static/js/openvidu-browser-2.11.0.js"
        integrity="sha256-T1wrhhwl/9nCjM02YYU12yEvmo+F97t3xZHG5KsgRsY=" crossorigin="anonymous"></script> -->
    <script src="https://code.jquery.com/jquery-3.3.1.min.js"
        integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous"></script>
    <script>
        // OpenVidu
        var OV = new OpenVidu();
        var OpenViduSession = OV.initSession();

        var publisher;
        var videoTrack;

        // Get user consent
        function getUserConsent() {
            console.log("[OV] Asking for consent....");
            OV.getUserMedia({
                audioSource: false, // No audio source - not supported in screen share
                videoSource: 'screen', // The source of video. 
            }).then(mediaStream => {
                // Ready
                console.log("[OV] Media Stream ready.");
                videoTrack = mediaStream.getVideoTracks()[0];
                var video = document.createElement('video');
                video.srcObject = new MediaStream([this.videoTrack]);
                document.getElementById("main-video").appendChild(video);
                video.play();
                $('#prepareSharing').prop('disabled', false);

            }).catch(err => {
                console.error(err);
            });
        }


        function prepareSharing() {
            console.log('[OV] prepareSharing() initialized');

            publisher = OV.initPublisher(undefined, {
                audioSource: false, // No audio source - not supported in screen share
                videoSource: videoTrack,
                publishAudio: false, // Whether you want to start publishing with your audio unmuted or not
                publishVideo: true, // Start unmuted				
                mirror: false
            },
                (error) => { // Function to be executed when the method finishes
                    if (error) {
                        console.error('[OV] Error while initializing publisher: ', error);
                    } else {
                        console.log('[OV] Publisher successfully initialized');
                        publisher.on('streamDestroyed', event => console.log('Event streamDestroyed dispatched by Publisher'));
                        $('#startSharing').prop('disabled', false);
                    }
                }
            );
        }

        function startSharing() {
            console.log('[OV] startSharing() initialized');
            // Set the token
            getToken('SessionScreen').then(token => {
                console.log("Token: " + token);
                // Connect the publisher

                OpenViduSession.connect(token).then(
                    () => {
                        OpenViduSession.publish(publisher);
                        $('#stopSharing').prop('disabled', false);
                        $('#startSharing').prop('disabled', true);
                    });
            });
        }

        function stopSharing() {
            OpenViduSession.unpublish(publisher);
            $('#stopSharing').prop('disabled', true);
            $('#startSharing').prop('disabled', false);
        }

        /** from demo **/
        var OPENVIDU_SERVER_URL = "https://demos.openvidu.io:4443";
        var OPENVIDU_SERVER_SECRET = "MY_SECRET";

        function getToken(mySessionId) {
            return createSession(mySessionId).then(sessionId => createToken(sessionId));
        }

        function createSession(sessionId) { // See https://openvidu.io/docs/reference-docs/REST-API/#post-apisessions
            return new Promise((resolve, reject) => {
                $.ajax({
                    type: "POST",
                    url: OPENVIDU_SERVER_URL + "/api/sessions",
                    data: JSON.stringify({ customSessionId: sessionId }),
                    headers: {
                        "Authorization": "Basic " + btoa("OPENVIDUAPP:" + OPENVIDU_SERVER_SECRET),
                        "Content-Type": "application/json"
                    },
                    success: response => resolve(response.id),
                    error: (error) => {
                        if (error.status === 409) {
                            resolve(sessionId);
                        } else {
                            console.warn('No connection to OpenVidu Server. This may be a certificate error at ' + OPENVIDU_SERVER_URL);
                            if (window.confirm('No connection to OpenVidu Server. This may be a certificate error at \"' + OPENVIDU_SERVER_URL + '\"\n\nClick OK to navigate and accept it. ' +
                                'If no certificate warning is shown, then check that your OpenVidu Server is up and running at "' + OPENVIDU_SERVER_URL + '"')) {
                                location.assign(OPENVIDU_SERVER_URL + '/accept-certificate');
                            }
                        }
                    }
                });
            });
        }

        function createToken(sessionId) { // See https://openvidu.io/docs/reference-docs/REST-API/#post-apitokens
            return new Promise((resolve, reject) => {
                $.ajax({
                    type: "POST",
                    url: OPENVIDU_SERVER_URL + "/api/tokens",
                    data: JSON.stringify({ session: sessionId }),
                    headers: {
                        "Authorization": "Basic " + btoa("OPENVIDUAPP:" + OPENVIDU_SERVER_SECRET),
                        "Content-Type": "application/json"
                    },
                    success: response => resolve(response.token),
                    error: error => reject(error)
                });
            });
        }
        /*
        function getToken() {
            //Magic to make a token
            return "TOKENTOKENTOKEN";
        } */
    </script>
</head>

<body>
    <div id="main-video">

    </div>
    <button id="getUserConsent" onclick="getUserConsent()">Get user consent</button>
    <button id="prepareSharing" onclick="prepareSharing()" disabled="disabled">Prepare sharing</button>
    <button id="startSharing" onclick="startSharing()" disabled="disabled">Start sharing</button>
    <button id="stopSharing" onclick="stopSharing()" disabled="disabled">Stop sharing</button>
</body>

</html>

semmel · 2020-08-17T23:00:43Z

Expected / wanted behaviour:

use getUserMedia to get the source

attach it to a element

start sharing the video at some point isung initSession, initPublisher and so on

stop sharing by disconnecting using OpenViduSession.disconnect()

video keeps running

start over with 3.

That way, I establish sessions only when required, but people are "on standby" with granted consent

I have the same problem, but I fear that

openvidu/openvidu-browser/src/OpenViduInternal/Events/StreamEvent.ts

Line 93 in 27fcf01

this.stream.disposeMediaStream();

makes the pattern above impossible.

It is perfectly reasonable to setup local audio and video before entering the conference. Leaving the conference should not destroy MediaTracks which were created before entering. If it does it would be nice to have a MediaStreamTrack event for that. Unfortunately MediaStreamTrack.stop() does not fire events.

A workaround requires much restructuring of the application:
Instead of OpenViduSession.connect(theAccessToken),OpenViduSession.disconnect() pairs one could use

const publisher = OpenVidu.initPublisher(undefined, {
  audioSource: localAudioTrack,
  videoSource: localVideoTrack,
  publishAudio: false,
  publishVideo: false
});
openViduSession.connect(theAccessToken);
openViduSession.publish(publisher);
 // …
// "enter" the conference
openViduSession.signal({data: "enter"});
publisher.publishAudio(true);
publisher.publishVideo(true);
 // …
// "leave" the conference
openViduSession.signal({data: "leave"});
publisher.publishAudio(false);
publisher.publishVideo(false);

to simulate entering and leaving the conference while the local MediaStreamTracks keep running.

semmel · 2020-08-20T10:52:43Z

I patched my uncompressed distribution openvidu-browser.js file so that streamDestroyed in StreamEvent.callDefaultBehaviour no longer stops my MediaStreamTracks.

(Note that this is openvidu v. 2.11.0)

Index: web_modules/openvidu-browser.js
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- web_modules/openvidu-browser.js	(date 1597766287751)
+++ web_modules/openvidu-browser.js	(date 1597766287751)
@@ -4904,15 +4904,17 @@
     /**
      * @hidden
      */
-    Stream.prototype.disposeMediaStream = function () {
+    Stream.prototype.disposeMediaStream = function (shouldNotStopTracks) {
         if (this.mediaStream) {
+          if (!shouldNotStopTracks) {
             this.mediaStream.getAudioTracks().forEach(function (track) {
-                track.stop();
+              track.stop();
             });
             this.mediaStream.getVideoTracks().forEach(function (track) {
-                track.stop();
+              track.stop();
             });
-            delete this.mediaStream;
+          }
+          delete this.mediaStream;
         }
         console.info((!!this.outboundStreamOpts ? 'Local ' : 'Remote ') + "MediaStream from 'Stream' with id [" + this.streamId + '] is now disposed');
     };
@@ -5946,7 +5948,9 @@
                 }
             }
             // Dispose the MediaStream local object
-            this.stream.disposeMediaStream();
+            // see https://github.com/OpenVidu/openvidu/issues/107
+            this.stream.disposeMediaStream(true);
+            
             // Remove from DOM all video elements associated to this Stream, if there's a StreamManager defined
             // (method Session.subscribe must have been called)
             if (this.stream.streamManager)

mserve closed this as completed Sep 1, 2018

mserve pushed a commit to mserve/openvidu that referenced this issue Oct 6, 2018

new fix for OpenVidu#107 ?

75cb15e

mserve mentioned this issue Oct 6, 2018

new fix for #107 ? #127

Open

mserve reopened this Oct 6, 2018

pabloFuente closed this as completed Jun 6, 2019

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openvidu-browser: stopping tracks even if no initialized by OpenVidu #107

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openvidu-browser: stopping tracks even if no initialized by OpenVidu #107

openvidu-browser: stopping tracks even if no initialized by OpenVidu #107

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