Hello, Why does QVideoWidget renders videos more smoothly than QGraphicsView with QGraphicsVideoItem by playing the same video? Example With QVideoWidget #include <QApplication> #include <QMainWindow> #include <QMediaPlayer> #include <QVideoWidget> int main(int argc, char *argv[]) { QApplication a(argc, argv); QMainWindow* mw = new QMainWindow; QVideoWidget* video_widget = new QVideoWidget; QMediaPlayer * player = new QMediaPlayer; player->setVideoOutput(video_widget); player->setMedia(QUrl::fromLocalFile("/path/to/file.mp4")); mw->setCentralWidget(video_widget); mw->show(); player->play(); return a.exec(); } Example with QGraphicsVideoItem #include <QApplication> #include <QMainWindow> #include <QMediaPlayer> #include <QGraphicsView> #include <QGraphicsVideoItem> #include <QGraphicsScene> int main(int argc, char *argv[]) { QApplication a(argc, argv); QMainWindow* mw = new QMainWindow; QGraphicsView* view = new QGraphicsView; QGraphicsScene* scene = new QGraphicsScene(view); view->setScene(scene); QMediaPlayer * player = new QMediaPlayer; QGraphicsVideoItem *item = new QGraphicsVideoItem; player->setVideoOutput(item); player->setMedia(QUrl::fromLocalFile("/path/to/file.mp4")); scene->addItem(item); player->play(); mw->setCentralWidget(view); mw->show(); return a.exec(); } The figures outline are pixelated. Also increasing the size of the window on QGraphicsView have a negative impact on performance. Pictures runs slower than the sound and picture movements are abrupt. These effects doesn't occur on QVideoWidget. Setting the view port to OpenGL with this call view->setViewport(new QGLWidget) improves the performance but it doesn't solve the problem of the quality of the video.

QtMM has a lot of issues, it sucks. You can try to use libVLC, ffmpeg or to use DirectShow directly (of course, if a Windows is your main platform).

Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.

Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).

QVideoWidget vs QGraphicsVideoItem

Unsolved General and Desktop

21 Posts 4 Posters 11.7k Views 2 Watching

G goldstar2154

@zahi.mashael Qt-Av provide qml components too, if you have time can you please compare Qt-av & Qt-vlc qml components? it will be interesting.
Z Offline
Z Offline
zahi.mashael

wrote on last edited by zahi.mashael

#21

@goldstar2154 I have already compared the two components and VLC-Qt qml is in my opinion better. I tested with a video that was created in adobe (1920x1080x30fps) with some move animations and movements""stutter" more with QtAV than with VLC-Qt.
1 Reply Last reply

0