QtMultimedia's backends uses the platform API so AVFoundation on OS X, WMF/DirectX on windows etc. The GStreamer backend is used on non-android non-mac unix variants.

If it's path issue, shell_path can help your there

I don't need every frame.
But thank you for the tip I will give it a try later.

I tried the suggestion from andreyc using QMediaPlayer::media() - which did not work. The QMediaResources had information like URL (localFile name), but the resolution data returned 0 (unknown).

I did find an answer at http://forum.qt.io/topic/31278/solved-get-resolution-of-a-video-file-40-qmediaplayer-41/2, using QGraphicsVideoItems class property: nativeSize after the video started playing. (Note here - need to wait for the video to actually load & play after calling QMediaPlayer::play(). )

Hi and welcome to devnet,

Looks like you hit QTBUG-42708 which is related to QTBUG-36175 that's in progress

After initializing them in constructor, the scene appears, video music is playing but
video is not.

@ header file
QGraphicsProxyWidget* proxy;
QGraphicsScene* scene;
QGraphicsView* view;
@

@
ui->setupUi(this);
scene = new QGraphicsScene(this);

ml = new WidgetMarqueeLabel(this); ml->setDirection(1); ml->setSpeed(1); ml->setAlignment(Qt::AlignBottom); ml->setText(QString("%1").arg(xmlValue[2])); ml->setFont(QFont("Arial", 15,30)); QGridLayout *layout= new QGridLayout; video(); layout->addWidget(videoWidget,0,0); layout->addWidget(videoWidget1,0,1); layout->addWidget(ml,1,0,1,2); layout->setColumnStretch(0,10); layout->setColumnStretch(1,10); QWidget *window= new QWidget; window->setLayout(layout); proxy= scene->addWidget(window); view = new QGraphicsView(scene); view->setFixedSize(800,900); view->show();

@