QMediaPlayer / QVideoWidget do not show

[GGAllin]

Hello every one
I have a big problem with a VideoPlayer ,
I can hear the audio but i can't see the video.

I'm using Qt 5.6.2 on OsX El capitan

here's my code

VideoPlayer::VideoPlayer(VideoMetadata* meta, QWidget* parent)
    : ContentWidget(parent)
    , metadata(meta)
    , player(new QMediaPlayer(this))
    , video(new QVideoWidget)
{

    // ContentWidget is QWidget  
    QVBoxLayout* layout = new QVBoxLayout;
    layout->addWidget(video);
    setLayout(layout);
    player->setVideoOutput(video);
    player->setMedia(QUrl::fromLocalFile("/Users/me/Desktop/VIDEO_TEST/video.mp4"));
    player->stop();

    connect(player, &QMediaPlayer::mediaStatusChanged,
        this, &VideoPlayer::mediaStateChanged);

    connect(player, &QMediaPlayer::positionChanged,
        this, &VideoPlayer::positionChanged);
}

VideoPlayer::~VideoPlayer()
{
}


void VideoPlayer::mediaStateChanged(QMediaPlayer::MediaStatus state)
{
    if (state == QMediaPlayer::MediaStatus::LoadedMedia) {
        player->play();
    }
}

this looks a bit strange because same code works fine in a separate application like:

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    QWidget *widget = new QWidget;
    widget->resize(400, 300);
    QVBoxLayout *layout = new QVBoxLayout;
    QMediaPlayer *player = new QMediaPlayer;
    QVideoWidget *vw = new QVideoWidget;
    layout->addWidget(vw);
    widget->setLayout(layout);
    player->setVideoOutput(vw);
    player->setMedia(QUrl::fromLocalFile("/Users/me/Desktop/VIDEO_TEST/video.mp4"));
    player->setVolume(50);
    player->play();
    widget->show();
    qDebug() << "mediaStatus: " << player->mediaStatus() << "error: " << player->error();

    return app.exec();
}

Thanks in advanced
GG

[jsulm]

@GGAllin You don't call

video->show();

[GGAllin]

thanks for reply
but show() is called externally (when new VideoPlayer() is called)

[mrjj]

Hi
So /Users/me/Desktop/VIDEO_TEST/video.mp4 does work in
other code, on same pc ?

[SGaist]

Hi,

Why are you calling stop in your custom widget constructor rather that play ?

[GGAllin]

@mrjj doesn't work just on VideoPlayer.cpp
VideoPlayer.cpp doesn't work on OSx and Win, but on Linux work perfectly after installation of gstreamer0.10-ffmpeg

here works perfectly

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    QWidget *widget = new QWidget;
    widget->resize(400, 300);
    QVBoxLayout *layout = new QVBoxLayout;
    QMediaPlayer *player = new QMediaPlayer;
    QVideoWidget *vw = new QVideoWidget;
    layout->addWidget(vw);
    widget->setLayout(layout);
    player->setVideoOutput(vw);
    player->setMedia(QUrl::fromLocalFile("/Users/me/Desktop/VIDEO_TEST/video.mp4"));
    player->setVolume(50);
    player->play();
    widget->show();
    qDebug() << "mediaStatus: " << player->mediaStatus() << "error: " << player->error();

    return app.exec();
}

@SGaist : i changed from stop to play in my contructor, but nothing's changed
ps: sorry for my bad english!

[SGaist]

Works fine on macOS, just change the path for the video.

#include <QApplication>
#include <QWidget>
#include <QVBoxLayout>

#include <QMediaPlayer> 
#include <QVideoWidget>

class Widget : public QWidget
{
public:
    Widget(QWidget *parent = 0)
        : QWidget(parent)
    {
        QVBoxLayout *layout = new QVBoxLayout(this);
        QMediaPlayer *player = new QMediaPlayer(this);
        QVideoWidget *vw = new QVideoWidget;
        layout->addWidget(vw);
        player->setVideoOutput(vw);
        player->setMedia(QUrl::fromLocalFile("/path/to/file"));
        player->setVolume(50);
        player->play();
    }
};

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    Widget widget;
    widget.resize(400, 300);
    widget.show();

    return app.exec();
}