QT Multimedia players for multiple video files

Kinesis

Is QT cable of creating multiple multimedia players for many video files??
I want to filter video files from a directory and display all videos on each media players (I use QGraphicView and media player).

SGaist

Hi and welcome to devnet,

It's up to you to create as many player as you want/need.

Kinesis

I want to know the way how to create media players for each video file

jsulm

@Kinesis Like shown in the documentation: http://doc.qt.io/qt-5/qmediaplayer.html ?

Kinesis

Yes I use qmediaplayer . But not like that . Here is my mainwindow.cpp.But it is for only 1 video with 1 player . I want multiple media players for multiple videos.

//mainwindow.cpp
MainWindow::MainWindow(QWidget parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QString directory = QFileDialog::getOpenFileName(this,tr("Open File"),"All files(.*)");
m_mediaPlayer = new QMediaPlayer(this, QMediaPlayer::VideoSurface);
const QRect screenGeometry = QApplication::desktop()->screenGeometry(this);
m_videoItem = new QGraphicsVideoItem;
m_mediaPlayer->setMedia(QUrl::fromLocalFile(directory));
m_videoItem->setSize(QSizeF(screenGeometry.width() / 3.2, screenGeometry.height() / 2.4));
QGraphicsScene *scene = new QGraphicsScene(this);
ui->graphicsView->setScene(scene);
scene->addItem(m_videoItem);

ui->pushButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));
connect(ui->pushButton, &QAbstractButton::clicked, this, &MainWindow::play);

m_mediaPlayer->setVideoOutput(m_videoItem);
connect(m_mediaPlayer, &QMediaPlayer::stateChanged,
this, &MainWindow::mediaStateChanged);
connect(m_mediaPlayer, &QMediaPlayer::positionChanged, this, &MainWindow::positionChanged);
connect(m_mediaPlayer, &QMediaPlayer::durationChanged, this, &MainWindow::durationChanged);

ui->horizontalSlider->setRange(0, 0);
connect(ui->horizontalSlider, &QAbstractSlider::sliderMoved,
this, &MainWindow::setPosition);
MainWindow::~MainWindow()
{
delete ui;
}

QSize MainWindow::sizeHint() const
{
return (m_videoItem->size() * qreal(3) / qreal(2)).toSize();
}

bool MainWindow::isPlayerAvailable() const
{
return m_mediaPlayer->isAvailable();
}

void MainWindow::play()
{
switch (m_mediaPlayer->state()) {
case QMediaPlayer::PlayingState:
m_mediaPlayer->pause();
break;
default:
m_mediaPlayer->play();
break;
}
}

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

void MainWindow::positionChanged(qint64 position)
{
ui->horizontalSlider->setValue(position);
}

void MainWindow::durationChanged(qint64 duration)
{
ui->horizontalSlider->setRange(0, duration);
}

void MainWindow::setPosition(int position)
{
m_mediaPlayer->setPosition(position);
}

jsulm

@Kinesis As @SGaist said you can create as many of them as you need.
What is the problem?
If you can create one you can create many in the same way...

Kinesis

@jsulm
The Problem is I don't know how to create multiple media players for multiple videos which are filtered from directory with looping or some QClasses .

jsulm

@Kinesis Please specify what exactly the problem is.
Is it: how to filter files in a directory?

Kinesis

@jsulm
Filtering the video file is not the problem.
The problem is I don't know how to show the filtered videos with media players.
It means that 1 video per 1 player , 5 videos per 5 players.

jsulm

@Kinesis You iterate over all the video files and create a player for each (like you already did above for one).

Kinesis

@jsulm
I know the logic but when it comes to coding I am really weak . please show me how to do it(just 1 example) . please :(

jsulm

@Kinesis Sorry, I will not write the code for you.
I really don't understand what the problem is as you already managed to create one player for one file...

Kinesis

@jsulm
Thanks for your help.I really appreciate that.

mrjj

@Kinesis
Hi
It is easier to help if you break down task in steps and ask pr step what we
would suggest.
Like getting all files in a folder you could do

#include <QDir>
//assume the directory exists and contains some files 
QDir directory("c:/xx/yyy"); // point to real folder
// ask for mp4 and avi. adjust to your needs
QStringList vids= directory.entryList(QStringList() << "*.mp4" << "*.avi",QDir::Files);
foreach(const QString &filename, vids) {
// new a player 
// insert to form or show as window
// give it file
// tell it to play
}

Kinesis

@mrjj
Thanks alot.

Kinesis

I got the answer . MainWindow.cpp is like that

 ui->listWidget->setFlow(QListView::LeftToRight);
    ui->listWidget->setMinimumSize(1050,800);
    ui->listWidget->setGridSize(QSize(340, 320));
    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()));
        videoItem = new QGraphicsVideoItem;
        videoItem->setSize(QSize(300,240));
        QGraphicsScene *scene = new QGraphicsScene(this);
        QGraphicsView *graphicsView = new QGraphicsView(scene);
        mediaPlayer->setVideoOutput(videoItem);

        QPushButton *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;
            }
        });



        QSlider *m_positionSlider = new QSlider(Qt::Horizontal,this);
        m_positionSlider->setRange(0,mediaPlayer->duration() / 1000);


        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(m_positionSlider ,&QAbstractSlider::sliderMoved, [mediaPlayer ,this] (int position){

            mediaPlayer->setPosition(position);
        });




        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);
        vb->addWidget(graphicsView);
        vb->addLayout(controlLayout);
        widget->setLayout(vb);
        widget->setMinimumSize(320, 320);
        ui->listWidget->setItemWidget(item,widget);
        player.append(mediaPlayer);
        scene->addItem(videoItem);



    }

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QT Multimedia players for multiple video files