void Video4LinuxWidget::on_applyButton_clicked()
{
    MLT.close();
    AbstractProducerWidget::setProducer(0);
    emit producerChanged(0);
    QCoreApplication::processEvents();

    Mlt::Producer* p = newProducer(MLT.profile());
    AbstractProducerWidget::setProducer(p);
    MLT.setProducer(p);
    MLT.play();
    emit producerChanged(p);
}
void NetworkProducerWidget::on_applyButton_clicked()
{
    MLT.setProducer(newProducer(MLT.profile()));
    MLT.play();
}