Phonon (or any else) video capture

[TimeCoder]

Hi!

I need video capture from web-camera (desktop application), under Windows 7 and Linux Mint. How to enumerate devices and run frames loop - I can't find it, and for begin I tryed execute this trivial code:

#include <QtGui/QApplication>
#include <phonon/VideoPlayer>
#include <QLabel>
#include <QUrl>
 
int main(int argc, char *argv[])
{
    QApplication a(argc,argv);
    a.setApplicationName("test");
    QLabel l;
    Phonon::VideoPlayer* player = new Phonon::VideoPlayer(Phonon::VideoCategory,&l);
    player->play(QUrl::fromLocalFile("d:\\test.avi"));
    l.show();
 
    return a.exec();
}

#include <QtGui/QApplication>
#include <phonon/VideoPlayer>
#include <QLabel>
#include <QUrl>

int main(int argc, char *argv[])
{
    QApplication a(argc,argv);
    a.setApplicationName("test");
    QLabel l;
    Phonon::VideoPlayer* player = new Phonon::VideoPlayer(Phonon::VideoCategory,&l);
    player->play(QUrl::fromLocalFile("d:\\test.avi"));
    l.show();

    return a.exec();
}

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Under Windows 7 this code doesn't work. Just blank window, no video.
Under Linux Mint this code doesn't compile (after adding QT += phonon in pro-file).

What I am doing wrong? Qt version: 4.8.2

Thank you in advance for your help.