play rtsp stream QMultimedia

[SansBlague]

hi,

i tried to play a rtsp stream, that is streammed with VLC on localhost

#include "VideoPlayer2.h"

#include <QtWidgets>
#include <qvideowidget.h>
#include <qvideosurfaceformat.h>
#include <QGraphicsScene>
#include <QGraphicsVideoItem>

VideoPlayer2::VideoPlayer2(QWidget *parent)
    : QWidget(parent)
    , mediaPlayer(0, QMediaPlayer::StreamPlayback)
    , playButton(0)
    , positionSlider(0)
    , errorLabel(0)
{
    QGraphicsView * view=new QGraphicsView(this);
    //QVideoWidget *videoWidget = new QVideoWidget;
    QGraphicsVideoItem *videoItem= new QGraphicsVideoItem();
    QGraphicsScene * scene =new QGraphicsScene(this);
    scene->addItem(videoItem);
    view->setScene(scene);

    QAbstractButton *openButton = new QPushButton(tr("Open..."));
    connect(openButton, SIGNAL(clicked()), this, SLOT(openFile()));

    playButton = new QPushButton;
    playButton->setEnabled(false);
    playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));

    connect(playButton, SIGNAL(clicked()),
            this, SLOT(play()));

    positionSlider = new QSlider(Qt::Horizontal);
    positionSlider->setRange(0, 0);

    connect(positionSlider, SIGNAL(sliderMoved(int)),
            this, SLOT(setPosition(int)));

    errorLabel = new QLabel;
    errorLabel->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Maximum);

    QBoxLayout *controlLayout = new QHBoxLayout;
    controlLayout->setMargin(0);
    controlLayout->addWidget(openButton);
    controlLayout->addWidget(playButton);
    controlLayout->addWidget(positionSlider);

    QBoxLayout *layout = new QVBoxLayout;
   // layout->addWidget(videoWidget);
	layout->addWidget(view);
    layout->addLayout(controlLayout);
    layout->addWidget(errorLabel);

    setLayout(layout);

    mediaPlayer.setVideoOutput(videoItem);
	//mediaPlayer.setMedia(
    connect(&mediaPlayer, SIGNAL(stateChanged(QMediaPlayer::State)),
            this, SLOT(mediaStateChanged(QMediaPlayer::State)));
    connect(&mediaPlayer, SIGNAL(positionChanged(qint64)), this, SLOT(positionChanged(qint64)));
    connect(&mediaPlayer, SIGNAL(durationChanged(qint64)), this, SLOT(durationChanged(qint64)));
    connect(&mediaPlayer, SIGNAL(error(QMediaPlayer::Error)), this, SLOT(handleError()));
    view->show();
}

VideoPlayer2::~VideoPlayer2()
{
}

void VideoPlayer2::openFile()
{
    errorLabel->setText("");

   // QString fileName = QFileDialog::getOpenFileName(this, tr("Open Movie"),QDir::homePath());
	QString fileName ="rtsp://localhost:8554/toto";
    if (!fileName.isEmpty()) {
        mediaPlayer.setMedia(QUrl(fileName));
        playButton->setEnabled(true);
    }
}

void VideoPlayer2::play()
{
    switch(mediaPlayer.state()) {
    case QMediaPlayer::PlayingState:
        mediaPlayer.pause();
        break;
    default:
        mediaPlayer.play();
        break;
    }
}

void VideoPlayer2::mediaStateChanged(QMediaPlayer::State state)
{
    switch(state) {
    case QMediaPlayer::PlayingState:
        playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause));
        break;
    default:
        playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));
        break;
    }
}

void VideoPlayer2::positionChanged(qint64 position)
{
    positionSlider->setValue(position);
}

void VideoPlayer2::durationChanged(qint64 duration)
{
    positionSlider->setRange(0, duration);
}

void VideoPlayer2::setPosition(int position)
{
    mediaPlayer.setPosition(position);
}

void VideoPlayer2::handleError()
{
    playButton->setEnabled(false);
    errorLabel->setText("Error: " + mediaPlayer.errorString());
}

But it does not work
here is what my error label says: " error: Failed to load source "
Can you please tell me why ?
help help I'm desperate

by the way, I'm using Qt5.3.2 visualStudio 2010
Thank you