Video transmission through ethernet port.

Prakash08

I'm trying to send a video file from one PC to other PC through ethernet port. After receiving the video and when I click on play button it should play on my GUI. My problem is, I'm able to receive video data, but when click on play button it is not playing the video ...

receiving code:

#include <QtWidgets>
#include <QtNetwork>
#include <QTcpServer>
#include <QTcpSocket>
#include <QFile>
#include <QBuffer>
#include <QMediaPlayer>
#include <QVideoWidget>

class VideoReceiver : public QWidget
{
    Q_OBJECT

public:
    VideoReceiver(QWidget *parent = nullptr) : QWidget(parent)
    {
        QLabel *label = new QLabel(tr("Received Video:"));
        videoWidget = new QVideoWidget;
        QPushButton *playButton = new QPushButton(tr("Play"));
        QVBoxLayout *layout = new QVBoxLayout;
        layout->addWidget(label);
        layout->addWidget(videoWidget);
        layout->addWidget(playButton);
        setLayout(layout);

        connect(playButton, &QPushButton::clicked, this, &VideoReceiver::playVideo);

        qDebug() << "Listening for connections...";
        server.listen(QHostAddress::Any, 12345); // Listen on port 12345
        connect(&server, &QTcpServer::newConnection, this, &VideoReceiver::startPlaying);
    }

private slots:
    void startPlaying()
    {
        qDebug() << "New connection established.";
        socket = server.nextPendingConnection();
        if (!socket) {
            qDebug() << "Error establishing connection";
            return;
        }

        qDebug() << "Connection established successfully.";

        player = new QMediaPlayer;
        player->setVideoOutput(videoWidget);
        buffer = new QBuffer(player);
        buffer->open(QIODevice::WriteOnly); // Open the buffer for writing
        if (!buffer->isOpen()) {
            qDebug() << "Buffer not open for writing";
            return;
        }

        qDebug() << "Buffer opened for writing.";

        connect(player, &QMediaPlayer::mediaStatusChanged, [=](QMediaPlayer::MediaStatus status) {
            qDebug() << "Media status changed:" << status;
            if (status == QMediaPlayer::LoadedMedia) {
                // Start feeding buffered data when player is ready
                buffer->open(QIODevice::ReadOnly);
                player->setMedia(QMediaContent(), buffer);
                player->play();
                qDebug() << "Playback started.";
            }
        });


        // Buffer received data
        connect(socket, &QTcpSocket::readyRead, [=]() {

            while (socket->bytesAvailable() > 0) {
                QByteArray data = socket->readAll(); // Read data from socket
                buffer->write(data); // Write data to buffer
                qDebug() << "Data received.";
            }
        });
    }

    void playVideo()
    {
        if (player) {
            qDebug() << "Attempting to play video...";
            player->play();
            qDebug() << "Play button clicked, playback started.";
        } else {
            qDebug() << "Player is not initialized.";
        }
    }

private:
    QTcpServer server;
    QTcpSocket *socket = nullptr;
    QMediaPlayer *player = nullptr;
    QBuffer *buffer = nullptr;
    QVideoWidget *videoWidget;
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    VideoReceiver receiver;
    receiver.show();
    return a.exec();
}

#include "main.moc"

SGaist

Hi,

Are you trying to reinvent video streaming ?
Playing a buffer of raw bytes from a video file alone won't do it. There is a minimal amount of data that you must have before trying to play anything. You might be starting to play on an empty buffer.

Prakash08

I'm not trying to reinvent anything. Then can you tell me the usual way of streaming a video ?

SGaist

Using something like GStreamer for example. You can use it both on the server and client side.

mrdebug

Hi, if you have to straming audio and video files you could use live555 on server side and, client side, only QMediaPlayer using rtsp.