Question

I have a simple Qt application that launches a window with a QWebView. I tried several sites using the video tag with h.264, and it either can’t play the video at all (as in youtube or sublime video), or it renders the video poorly, with black lines covering parts of it, like when viewing the video here.

Is this a known issue with QtWebKit, or have I neglected to do something that would make it work better? My code is below.

#include <QtGui/QApplication>
#include <QWebView>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QWebView *view = new QWebView();
    view->load(QUrl("http://webkit.org/blog/140/html5-media-support/"));
    view->show();

    return a.exec();
}

Answer 1

What platform are you on and what codecs are you using, I believe qt uses a thin layer over the system codecs DirectShow/Quicktime/Gstreamer or possibly xine/vlc if configured that way.
Maybe you have bad codecs, see whether you can view h264 videos with your system codecs.