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session.createStream({
    name: streamName,
    display: localVideo,
    cacheLocalResources: true
}).on(STREAM_STATUS.PUBLISHING, function(publishStream){
    setStatus(STREAM_STATUS.PUBLISHING);
    //play preview
    session.createStream({
        name: streamName,
        display: remoteVideo
    }).on(STREAM_STATUS.PLAYING, function(previewStream){
        //enable stop button
        onStarted(publishStream, previewStream);
    }).on(STREAM_STATUS.STOPPED, function(){
        publishStream.stop();
    }).on(STREAM_STATUS.FAILED, function(){
        //preview failed, stop publishStream
        if (publishStream.status() == STREAM_STATUS.PUBLISHING) {
            setStatus(STREAM_STATUS.FAILED);
            publishStream.stop();
        }
    }).play();
    ...
}).publish();

    session.createStream({
        name: streamName,
        display: remoteVideo
    }).on(STREAM_STATUS.PLAYING, function(previewStream){
        ...
    }).on(STREAM_STATUS.STOPPED, function(){
        publishStream.stop();
    }).on(STREAM_STATUS.FAILED, function(){
        ...
    }).play();

    session.createStream({
        name: streamName,
        display: remoteVideo
    }).on(STREAM_STATUS.PLAYING, function(previewStream){
        ...
    }).on(STREAM_STATUS.STOPPED, function(){
        publishStream.stop();
    }).on(STREAM_STATUS.FAILED, function(){
        ...
    }).play();