import sys
from PyQt4 import QtCore, QtGui
from PyQt4.phonon import Phonon
from gui import Ui_Form

class StartQT4(QtGui.QMainWindow):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)
        self.ui = Ui_Form()
        self.ui.setupUi(self)
        source = Phonon.MediaSource("http://www.youtube.com/watch?v=xLho8rMQpoI")
        self.ui.videoPlayer.mediaObject().setCurrentSource(source)
        self.ui.videoPlayer.play()
if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    myapp = StartQT4()
    myapp.show()
    sys.exit(app.exec_())