QObject::connect(m_vf, SIGNAL(renderAreaChanged()), this, SIGNAL(renderAreaChanged()));
QObject::connect(m_vf, SIGNAL(videoResolutionChanged()), this, SIGNAL(videoResolutionChanged()));
QObject::connect(m_vf, SIGNAL(renderAreaChanged()), this, SIGNAL(renderAreaChanged()));
QObject::connect(m_vf, SIGNAL(videoResolutionChanged()), this, SIGNAL(videoResolutionChanged()));