Bei qdvdauthor (aur.archlinux.org/packages/qdvdauthor) wenn men ein video hinzufügen will gibt es folgende Meldung
[gons@phoenix bin]$ ./qdvdauthor
QEventLoop: Cannot be used without QApplication
QObject::connect: No such signal QAction::activated()
QObject::connect: No such slot QDVDAuthor::slotAddFrameObject ( )
QObject::connect: No such slot QDVDAuthor::slotAddTextObject ( )
QObject::connect: No such slot QDVDAuthor::slotAddImageObject ( )
QObject::connect: No such slot QDVDAuthor::slotAddMovieObject ( )
QObject::connect: No such signal QLineEdit::lostFocus ( )
QObject::connect: (sender name: 'm_pEditZoom')
QObject::connect: (receiver name: 'uiDVDLayout')
QObject::connect: No such signal QDVDAuthor::signalVisibleRegion(bool)
QLayout: Attempting to add QLayout "" to FilePreview_Dialog "PreviewFileDialog", which already has a layout
*** stack smashing detected ***: terminated
Abgebrochen (Speicherabzug geschrieben)
[gons@phoenix bin]$

wie läst sich feststellen woran der Fehler liegt?

In qdvdauthor-2.3.1/qdvdauthor/qplayer/engines/qxinewidget.cpp (bool QXineWidget::taskInitXine(){}) diese beide Stellen verursachen diesen Fehler:
i = xine_config_register_enum(xineEngine, "gui.audiodriver", 0,
audioChoices, audioInfo, NULL, 10, &QXineWidget::AudioDriverChangedCallback, this);

und
i = xine_config_register_enum(xineEngine, "gui.videodriver", 0,
videoChoices, videoInfo, NULL, 10, &QXineWidget::VideoDriverChangedCallback, this);