[SOLVED] get resolution of a video file ( QMediaPlayer )

[Timmoth]

Hi, i am trying to acquire the resolution of a video before i play it however this code returns -1, -1:
@
mediaPlayer.media().canonicalResource().resolution()
@

any suggestions on how to get a files resolution?

Regards, Tim.

[Timmoth]

for anyone who maybe having the same issue as me:

I solved my problem by waiting until the user plays the video and as soon as they do so i get the QGraphicsVideoItems class property: nativeSize.

[deepakiitr]

I solved it by using the signal metaDataChanged(key, value) when key is "Resolution".
Create a QMediaPlayer and set its media content, and use that signal. It is not necessory to play the media.

[Jim_tkb]

I cannot get signal metaDataChanged(key, value) after setMedia from QMediaPlayer. metaDataChanged() signal is workng, though. Does Anyone know the solution?

[David A. Osipyan]

You can use QVideoWidget instance as video output for QMediaPlayer and retrieve native size of video from QVideoWidget::sizeHint.

QSize MyVideoPlayer::getVideoNativeSize(const QString& videoFilePath)
{
    m_mediaPlayer = new QMediaPlayer(0, QMediaPlayer::VideoSurface);
    m_mediaPlayer->setVideoOutput(m_videoWidget);
    m_mediaPlayer->setMedia(QUrl::fromLocalFile(videoFilePath));
    connect(m_mediaPlayer, SIGNAL(mediaStatusChanged(QMediaPlayer::MediaStatus)),
            this, SLOT(OnMediaStatusChanged(QMediaPlayer::MediaStatus)));

    m_isStoppingVideo = false;
    m_videoScreenSize = QSize();
    QEventLoop loop;
    m_mediaPlayer->play();
    while (!m_isStoppingVideo)
    {
        loop.processEvents();
    }
    disconnect(m_mediaPlayer, SIGNAL(mediaStatusChanged(QMediaPlayer::MediaStatus)),
                this, SLOT(OnMediaStatusChanged(QMediaPlayer::MediaStatus)));

    m_mediaPlayer->stop();
    return m_videoWidget->sizeHint();
}

void MyVideoPlayer::OnMediaStatusChanged(QMediaPlayer::MediaStatus mediaStatus)
{
    if (mediaStatus == QMediaPlayer::BufferedMedia)
    {
        m_isStoppingVideo = true;
    }
}