m_glWidget->setImageAspectRatio(render->dar());
m_glWidget->setBackgroundColor(KdenliveSettings::window_background());
connect(render, SIGNAL(showImageSignal(QImage)), m_glWidget, SLOT(showImage(QImage)));
m_glWidget->setImageAspectRatio(render->dar());
m_glWidget->setBackgroundColor(KdenliveSettings::window_background());
connect(render, SIGNAL(showImageSignal(QImage)), m_glWidget, SLOT(showImage(QImage)));