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Media player not working for multiple videos

Scheduled Pinned Locked Moved Solved General and Desktop
qt 5.5videosurfacemedia playergraphicview
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  • A aha_1980
    3 Jul 2018, 07:57

    @Kinesis I will tell you my insights from reading this thread: you should really take a C++ book and start with simple examples.

    you are lacking simple programming knowledge, sorry. most of your problems are not related to Qt.

    So please, start learning C++. it will help you a lot.

    K Offline
    K Offline
    Kinesis
    wrote on 3 Jul 2018, 08:01 last edited by
    #28

    @aha_1980
    Thanks for your suggestion . I am learning c++ now . I also like to try writing UI that's why I am approaching QT .

    1 Reply Last reply
    0
    • J jsulm
      3 Jul 2018, 07:54

      @Kinesis Please show your code...
      You need to put the code I shown AFTER you created m_playButton.

      K Offline
      K Offline
      Kinesis
      wrote on 3 Jul 2018, 08:17 last edited by
      #29

      @jsulm
      Here is the code

      MainWindow::MainWindow(QWidget *parent) :
          QMainWindow(parent),
          ui(new Ui::MainWindow)
      {
          ui->setupUi(this);
          
          ui->listWidget->setFlow(QListView::LeftToRight);
          ui->listWidget->setMinimumSize(1200,350);
          ui->listWidget->setGridSize(QSize(360, 360));
          ui->listWidget->setResizeMode(QListView::Adjust);
          ui->listWidget->setViewMode(QListView::ListMode);
          ui->listWidget->setWrapping(true);
          
          QDir directory = QFileDialog::getExistingDirectory(this, tr("Open Directory"),"/home",
                                                             
                                                             QFileDialog::ShowDirsOnly| QFileDialog::DontResolveSymlinks);
          
          directory.setNameFilters({"*.mp4" , "*.avi" , "*.flv" , "*.mwv"});
          
          for(const QFileInfo & finfo: directory.entryInfoList()){
              QMediaPlayer *mediaPlayer = new QMediaPlayer();
              mediaPlayer->setMedia(QUrl::fromLocalFile(finfo.absoluteFilePath()));
              // mediaPlayer->setMedia(playlist);
              videoItem = new QGraphicsVideoItem;
              videoItem->setSize(QSize(320,240));
              QGraphicsScene *scene = new QGraphicsScene(this);
              QGraphicsView *graphicsView = new QGraphicsView(scene);
              
              
              
              
              mediaPlayer->setVideoOutput(videoItem);
              player.append(mediaPlayer);
              scene->addItem(videoItem);
              
              connect(mediaPlayer, &QMediaPlayer::stateChanged, this, &MainWindow::mediaStateChanged);
              
              connect(mediaPlayer, &QMediaPlayer::positionChanged, this, &MainWindow::positionChanged);
              connect(mediaPlayer, &QMediaPlayer::durationChanged, this, &MainWindow::durationChanged);
              
              m_playButton = new QPushButton;
              m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));
              
              connect(m_playButton, &QAbstractButton::clicked, [mediaPlayer]() {
                  switch (mediaPlayer->state()) {
                  case QMediaPlayer::PlayingState:
                      mediaPlayer->pause();
                      break;
                  default:
                      mediaPlayer->play();
                      break;
                  }
              });
              
              connect(mediaPlayer, &QMediaPlayer::stateChanged, [m_playButton, this](QMediaPlayer::State state) {
                  switch(state) {
                  case QMediaPlayer::PlayingState:
                      m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause));
                      break;
                  default:
                      m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));
                      break;
                  }
              });
              
              
              //connect(m_playButton, &QAbstractButton::clicked, this, &MainWindow::play);
              //connect(m_positionSlider, &QAbstractSlider::sliderMoved,this, &MainWindow::setPosition);
              
              
              
              m_positionSlider = new QSlider(Qt::Horizontal);
              m_positionSlider->setRange(0, 0);
              
              
              auto    item = new QListWidgetItem("", ui->listWidget);
              auto    widget = new QWidget;
              auto    label = new QLabel(finfo.fileName());
              auto    vb = new QVBoxLayout;
              
              QBoxLayout *controlLayout = new QHBoxLayout;
              controlLayout->setMargin(0);
              controlLayout->addWidget(m_playButton);
              controlLayout->addWidget(m_positionSlider);
              
              vb->addWidget(label,1);
              vb->addWidget(graphicsView,9);
              vb->addLayout(controlLayout);
              widget->setLayout(vb);
              widget->setMinimumSize(340, 340);
              ui->listWidget->setItemWidget(item,widget);
              
              
          }
              
      }
      MainWindow::~MainWindow()
      {
          delete ui;
      }
      QSize MainWindow::sizeHint() const
      {
          return (videoItem->size() * qreal(3) / qreal(2)).toSize();
      }
      
      void MainWindow::positionChanged(qint64 position)
      {
          m_positionSlider->setValue(position);
      }
      
      void MainWindow::durationChanged(qint64 duration)
      {
          m_positionSlider->setRange(0, duration);
      }
      
      void MainWindow::setPosition(int position)
      {
          QMediaPlayer *mediaPlayer = player[1];
          mediaPlayer->setPosition(position);
      }
      
      J D 2 Replies Last reply 3 Jul 2018, 08:30
      0
      • K Kinesis
        3 Jul 2018, 08:17

        @jsulm
        Here is the code

        MainWindow::MainWindow(QWidget *parent) :
            QMainWindow(parent),
            ui(new Ui::MainWindow)
        {
            ui->setupUi(this);
            
            ui->listWidget->setFlow(QListView::LeftToRight);
            ui->listWidget->setMinimumSize(1200,350);
            ui->listWidget->setGridSize(QSize(360, 360));
            ui->listWidget->setResizeMode(QListView::Adjust);
            ui->listWidget->setViewMode(QListView::ListMode);
            ui->listWidget->setWrapping(true);
            
            QDir directory = QFileDialog::getExistingDirectory(this, tr("Open Directory"),"/home",
                                                               
                                                               QFileDialog::ShowDirsOnly| QFileDialog::DontResolveSymlinks);
            
            directory.setNameFilters({"*.mp4" , "*.avi" , "*.flv" , "*.mwv"});
            
            for(const QFileInfo & finfo: directory.entryInfoList()){
                QMediaPlayer *mediaPlayer = new QMediaPlayer();
                mediaPlayer->setMedia(QUrl::fromLocalFile(finfo.absoluteFilePath()));
                // mediaPlayer->setMedia(playlist);
                videoItem = new QGraphicsVideoItem;
                videoItem->setSize(QSize(320,240));
                QGraphicsScene *scene = new QGraphicsScene(this);
                QGraphicsView *graphicsView = new QGraphicsView(scene);
                
                
                
                
                mediaPlayer->setVideoOutput(videoItem);
                player.append(mediaPlayer);
                scene->addItem(videoItem);
                
                connect(mediaPlayer, &QMediaPlayer::stateChanged, this, &MainWindow::mediaStateChanged);
                
                connect(mediaPlayer, &QMediaPlayer::positionChanged, this, &MainWindow::positionChanged);
                connect(mediaPlayer, &QMediaPlayer::durationChanged, this, &MainWindow::durationChanged);
                
                m_playButton = new QPushButton;
                m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));
                
                connect(m_playButton, &QAbstractButton::clicked, [mediaPlayer]() {
                    switch (mediaPlayer->state()) {
                    case QMediaPlayer::PlayingState:
                        mediaPlayer->pause();
                        break;
                    default:
                        mediaPlayer->play();
                        break;
                    }
                });
                
                connect(mediaPlayer, &QMediaPlayer::stateChanged, [m_playButton, this](QMediaPlayer::State state) {
                    switch(state) {
                    case QMediaPlayer::PlayingState:
                        m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause));
                        break;
                    default:
                        m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));
                        break;
                    }
                });
                
                
                //connect(m_playButton, &QAbstractButton::clicked, this, &MainWindow::play);
                //connect(m_positionSlider, &QAbstractSlider::sliderMoved,this, &MainWindow::setPosition);
                
                
                
                m_positionSlider = new QSlider(Qt::Horizontal);
                m_positionSlider->setRange(0, 0);
                
                
                auto    item = new QListWidgetItem("", ui->listWidget);
                auto    widget = new QWidget;
                auto    label = new QLabel(finfo.fileName());
                auto    vb = new QVBoxLayout;
                
                QBoxLayout *controlLayout = new QHBoxLayout;
                controlLayout->setMargin(0);
                controlLayout->addWidget(m_playButton);
                controlLayout->addWidget(m_positionSlider);
                
                vb->addWidget(label,1);
                vb->addWidget(graphicsView,9);
                vb->addLayout(controlLayout);
                widget->setLayout(vb);
                widget->setMinimumSize(340, 340);
                ui->listWidget->setItemWidget(item,widget);
                
                
            }
                
        }
        MainWindow::~MainWindow()
        {
            delete ui;
        }
        QSize MainWindow::sizeHint() const
        {
            return (videoItem->size() * qreal(3) / qreal(2)).toSize();
        }
        
        void MainWindow::positionChanged(qint64 position)
        {
            m_positionSlider->setValue(position);
        }
        
        void MainWindow::durationChanged(qint64 duration)
        {
            m_positionSlider->setRange(0, duration);
        }
        
        void MainWindow::setPosition(int position)
        {
            QMediaPlayer *mediaPlayer = player[1];
            mediaPlayer->setPosition(position);
        }
        
        J Offline
        J Offline
        jsulm
        Lifetime Qt Champion
        wrote on 3 Jul 2018, 08:30 last edited by
        #30

        @Kinesis And exactly this code does not build?

        https://forum.qt.io/topic/113070/qt-code-of-conduct

        1 Reply Last reply
        0
        • K Kinesis
          3 Jul 2018, 08:17

          @jsulm
          Here is the code

          MainWindow::MainWindow(QWidget *parent) :
              QMainWindow(parent),
              ui(new Ui::MainWindow)
          {
              ui->setupUi(this);
              
              ui->listWidget->setFlow(QListView::LeftToRight);
              ui->listWidget->setMinimumSize(1200,350);
              ui->listWidget->setGridSize(QSize(360, 360));
              ui->listWidget->setResizeMode(QListView::Adjust);
              ui->listWidget->setViewMode(QListView::ListMode);
              ui->listWidget->setWrapping(true);
              
              QDir directory = QFileDialog::getExistingDirectory(this, tr("Open Directory"),"/home",
                                                                 
                                                                 QFileDialog::ShowDirsOnly| QFileDialog::DontResolveSymlinks);
              
              directory.setNameFilters({"*.mp4" , "*.avi" , "*.flv" , "*.mwv"});
              
              for(const QFileInfo & finfo: directory.entryInfoList()){
                  QMediaPlayer *mediaPlayer = new QMediaPlayer();
                  mediaPlayer->setMedia(QUrl::fromLocalFile(finfo.absoluteFilePath()));
                  // mediaPlayer->setMedia(playlist);
                  videoItem = new QGraphicsVideoItem;
                  videoItem->setSize(QSize(320,240));
                  QGraphicsScene *scene = new QGraphicsScene(this);
                  QGraphicsView *graphicsView = new QGraphicsView(scene);
                  
                  
                  
                  
                  mediaPlayer->setVideoOutput(videoItem);
                  player.append(mediaPlayer);
                  scene->addItem(videoItem);
                  
                  connect(mediaPlayer, &QMediaPlayer::stateChanged, this, &MainWindow::mediaStateChanged);
                  
                  connect(mediaPlayer, &QMediaPlayer::positionChanged, this, &MainWindow::positionChanged);
                  connect(mediaPlayer, &QMediaPlayer::durationChanged, this, &MainWindow::durationChanged);
                  
                  m_playButton = new QPushButton;
                  m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));
                  
                  connect(m_playButton, &QAbstractButton::clicked, [mediaPlayer]() {
                      switch (mediaPlayer->state()) {
                      case QMediaPlayer::PlayingState:
                          mediaPlayer->pause();
                          break;
                      default:
                          mediaPlayer->play();
                          break;
                      }
                  });
                  
                  connect(mediaPlayer, &QMediaPlayer::stateChanged, [m_playButton, this](QMediaPlayer::State state) {
                      switch(state) {
                      case QMediaPlayer::PlayingState:
                          m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause));
                          break;
                      default:
                          m_playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));
                          break;
                      }
                  });
                  
                  
                  //connect(m_playButton, &QAbstractButton::clicked, this, &MainWindow::play);
                  //connect(m_positionSlider, &QAbstractSlider::sliderMoved,this, &MainWindow::setPosition);
                  
                  
                  
                  m_positionSlider = new QSlider(Qt::Horizontal);
                  m_positionSlider->setRange(0, 0);
                  
                  
                  auto    item = new QListWidgetItem("", ui->listWidget);
                  auto    widget = new QWidget;
                  auto    label = new QLabel(finfo.fileName());
                  auto    vb = new QVBoxLayout;
                  
                  QBoxLayout *controlLayout = new QHBoxLayout;
                  controlLayout->setMargin(0);
                  controlLayout->addWidget(m_playButton);
                  controlLayout->addWidget(m_positionSlider);
                  
                  vb->addWidget(label,1);
                  vb->addWidget(graphicsView,9);
                  vb->addLayout(controlLayout);
                  widget->setLayout(vb);
                  widget->setMinimumSize(340, 340);
                  ui->listWidget->setItemWidget(item,widget);
                  
                  
              }
                  
          }
          MainWindow::~MainWindow()
          {
              delete ui;
          }
          QSize MainWindow::sizeHint() const
          {
              return (videoItem->size() * qreal(3) / qreal(2)).toSize();
          }
          
          void MainWindow::positionChanged(qint64 position)
          {
              m_positionSlider->setValue(position);
          }
          
          void MainWindow::durationChanged(qint64 duration)
          {
              m_positionSlider->setRange(0, duration);
          }
          
          void MainWindow::setPosition(int position)
          {
              QMediaPlayer *mediaPlayer = player[1];
              mediaPlayer->setPosition(position);
          }
          
          D Offline
          D Offline
          Devopia53
          wrote on 3 Jul 2018, 08:38 last edited by
          #31

          @Kinesis

          Declare QPushButton as a local variable like a mediaPlayer. A lambda function can not capture member variables of this.

          A 1 Reply Last reply 3 Jul 2018, 08:41
          0
          • D Devopia53
            3 Jul 2018, 08:38

            @Kinesis

            Declare QPushButton as a local variable like a mediaPlayer. A lambda function can not capture member variables of this.

            A Offline
            A Offline
            aha_1980
            Lifetime Qt Champion
            wrote on 3 Jul 2018, 08:41 last edited by
            #32

            @Devopia53 No, it can:

            auto l = [this]() {
              // use members of this here
            }
            

            Qt has to stay free or it will die.

            D 1 Reply Last reply 3 Jul 2018, 11:24
            0
            • K Offline
              K Offline
              Kinesis
              wrote on 3 Jul 2018, 08:49 last edited by Kinesis 7 Mar 2018, 09:01
              #33

              @jsulm - Yes it does not work
              @Devopia53 - When I declare local variable , it works.
              @aha_1980 - I will also try like U said .
              Sorry for replying in the same reply . Because I am a new user . I can only post per every 600s

              1 Reply Last reply
              0
              • K Offline
                K Offline
                Kinesis
                wrote on 3 Jul 2018, 09:21 last edited by Kinesis 7 Apr 2018, 04:06
                #34

                I still have a question . I replaced the slider slots into loop but I can't control the sliders and sliders are not moving when the videos are running .
                Here is the slider code

                QSlider *m_positionSlider = new QSlider(Qt::Horizontal);
                        m_positionSlider->setRange(0, 0);
                
                       
                        connect(mediaPlayer, &QMediaPlayer::positionChanged ,[m_positionSlider, this](qint64 position){
                
                            m_positionSlider->setValue(position);
                        });
                
                        connect(mediaPlayer, &QMediaPlayer::durationChanged ,[m_positionSlider, this](qint64 duration){
                
                            m_positionSlider->setRange(0,duration);
                        });
                
                
                        connect(mediaPlayer , &QMediaPlayer::setPosition, [mediaPlayer ,this] (int position){
                
                            mediaPlayer->setPosition(position);
                        });
                
                
                J 1 Reply Last reply 3 Jul 2018, 10:27
                0
                • K Kinesis
                  3 Jul 2018, 09:21

                  I still have a question . I replaced the slider slots into loop but I can't control the sliders and sliders are not moving when the videos are running .
                  Here is the slider code

                  QSlider *m_positionSlider = new QSlider(Qt::Horizontal);
                          m_positionSlider->setRange(0, 0);
                  
                         
                          connect(mediaPlayer, &QMediaPlayer::positionChanged ,[m_positionSlider, this](qint64 position){
                  
                              m_positionSlider->setValue(position);
                          });
                  
                          connect(mediaPlayer, &QMediaPlayer::durationChanged ,[m_positionSlider, this](qint64 duration){
                  
                              m_positionSlider->setRange(0,duration);
                          });
                  
                  
                          connect(mediaPlayer , &QMediaPlayer::setPosition, [mediaPlayer ,this] (int position){
                  
                              mediaPlayer->setPosition(position);
                          });
                  
                  
                  J Offline
                  J Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on 3 Jul 2018, 10:27 last edited by jsulm 7 Mar 2018, 10:30
                  #35

                  @Kinesis What is this:

                  connect(mediaPlayer , &QMediaPlayer::setPosition, [mediaPlayer ,this] (int position){
                  
                              mediaPlayer->setPosition(position);
                          });
                  

                  ?
                  QMediaPlayer::setPosition() is a slot not a signal.
                  I think you need to change the range

                  m_positionSlider->setRange(0, 0);
                  

                  You can use http://doc.qt.io/qt-5/qmediaplayer.html#duration-prop to set the range.

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

                  K 1 Reply Last reply 4 Jul 2018, 04:18
                  1
                  • A aha_1980
                    3 Jul 2018, 08:41

                    @Devopia53 No, it can:

                    auto l = [this]() {
                      // use members of this here
                    }
                    
                    D Offline
                    D Offline
                    Devopia53
                    wrote on 3 Jul 2018, 11:24 last edited by Devopia53 7 Mar 2018, 11:25
                    #36

                    @aha_1980

                    I know that well(as [&] or [=]). But what I have described is that you have captured the member variables of the this object directly. Take a look at his source code. here: connect(mediaPlayer, &QMediaPlayer::stateChanged, [m_playButton, this](QMediaPlayer::State state)
                    A m_playButton is a member of the this.

                    1 Reply Last reply
                    1
                    • J jsulm
                      3 Jul 2018, 10:27

                      @Kinesis What is this:

                      connect(mediaPlayer , &QMediaPlayer::setPosition, [mediaPlayer ,this] (int position){
                      
                                  mediaPlayer->setPosition(position);
                              });
                      

                      ?
                      QMediaPlayer::setPosition() is a slot not a signal.
                      I think you need to change the range

                      m_positionSlider->setRange(0, 0);
                      

                      You can use http://doc.qt.io/qt-5/qmediaplayer.html#duration-prop to set the range.

                      K Offline
                      K Offline
                      Kinesis
                      wrote on 4 Jul 2018, 04:18 last edited by
                      #37

                      @jsulm
                      Thanks for your suggestion . Now the slider is running along with video.But to use it like skip slider how should I correct this "QMediaPlayer::setPosition() " which is a slot but not a signal ?By the way , sorry for late response .

                      J 1 Reply Last reply 4 Jul 2018, 04:21
                      0
                      • K Kinesis
                        4 Jul 2018, 04:18

                        @jsulm
                        Thanks for your suggestion . Now the slider is running along with video.But to use it like skip slider how should I correct this "QMediaPlayer::setPosition() " which is a slot but not a signal ?By the way , sorry for late response .

                        J Offline
                        J Offline
                        jsulm
                        Lifetime Qt Champion
                        wrote on 4 Jul 2018, 04:21 last edited by
                        #38

                        @Kinesis You don't need

                        connect(mediaPlayer , &QMediaPlayer::setPosition, [mediaPlayer ,this] (int position){
                        
                                    mediaPlayer->setPosition(position);
                                });
                        

                        You're already using QMediaPlayer::positionChanged...

                        https://forum.qt.io/topic/113070/qt-code-of-conduct

                        K 1 Reply Last reply 4 Jul 2018, 04:39
                        0
                        • J jsulm
                          4 Jul 2018, 04:21

                          @Kinesis You don't need

                          connect(mediaPlayer , &QMediaPlayer::setPosition, [mediaPlayer ,this] (int position){
                          
                                      mediaPlayer->setPosition(position);
                                  });
                          

                          You're already using QMediaPlayer::positionChanged...

                          K Offline
                          K Offline
                          Kinesis
                          wrote on 4 Jul 2018, 04:39 last edited by
                          #39

                          @jsulm
                          I got this. It's done now. My code is working fully 100% now . Thanks a lot for helping me . I fell bad that I wasted your time . By the way should I upload my
                          code ? It might help someone . Thanks.

                          J 1 Reply Last reply 4 Jul 2018, 04:45
                          1
                          • K Kinesis
                            4 Jul 2018, 04:39

                            @jsulm
                            I got this. It's done now. My code is working fully 100% now . Thanks a lot for helping me . I fell bad that I wasted your time . By the way should I upload my
                            code ? It might help someone . Thanks.

                            J Offline
                            J Offline
                            jsulm
                            Lifetime Qt Champion
                            wrote on 4 Jul 2018, 04:45 last edited by
                            #40

                            @Kinesis No need to feel bad - I'm helping here voluntary :-)
                            I don't think you need to upload your code. If somebody has questions he/she can ask.

                            https://forum.qt.io/topic/113070/qt-code-of-conduct

                            1 Reply Last reply
                            2
                            • W Offline
                              W Offline
                              WoodyLanes
                              Banned
                              wrote on 31 Aug 2022, 18:57 last edited by WoodyLanes
                              #41
                              This post is deleted!
                              1 Reply Last reply
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