QtGStreamer: Segmentation fault when calling query function

[Benjamin Federau]

Mandeep Sandhu <mandeepsandhu.chd at gmail.com> hat am 25. April 2013 um 12:15
geschrieben:


> 
> On Wed, Apr 24, 2013 at 8:07 PM, bfederau <benjamin.federau at basyskom.com
> [mailto:benjamin.federau at basyskom.com] >wrote:
> 
> > Hi,
> > 
> > I have implemented the following Qt function
> > 
> > QTime Player::getPosition()
> > {
> >     if (m_pipeline) {
> >         QGst::PositionQueryPtr query =
> > QGst::PositionQuery::create(QGst::FormatTime);
> >         m_pipeline->query(query);
> >         return QGst::ClockTime(query->position()).toTime();
> >     } else {
> >         return QTime();
> >     }
> > }
> > 
> > When it comes to the m_pipeline->query(query) line the app crashes with a
> > Segmentation fault.
> > 
> > The backtrace is:
> > #0  0x00000011 in ?? ()
> > #1  0xb335b41d in QGlib::RefPointer<QGst::PositionQuery>::clear() () from
> > /home/meego/mediaplayer/libMediaPlayer.so
> > #2  0xb335a7c6 in QGlib::RefPointer<QGst::PositionQuery>::~RefPointer() ()
> > from /home/meego/mediaplayer/libMediaPlayer.so
> > #3  0xb3359489 in Player::getPosition() () from
> > /home/meego/mediaplayer/libMediaPlayer.so
> > .....
> > 
> > And on console I get a:
> > GLib-GObject-CRITICAL **: g_value_get_int64: assertion `G_VALUE_HOLDS_INT64
> > (value)' failed
> > 
> > 
> > Can somebody give me a hint whats going wrong here?
> > 
Can you share a sample program that illustrates this issue. I can try it locally
here.
> 
> 
> -mandeep
> 
> 
> 
> 

 
I forgot to say that I'm using the Qt5 ported version of qt-gstreamer that I
have found at
https://code.launchpad.net/~phablet-team/phablet-extras/qt-gstreamer
 
The problem was that the Qt5 QML plugin was not ported yet, because of the
change from Graphics View (Qt4) to Scene Graph (Qt5). For my purpose I have
ported the QML plugin using the PaintedItem (Painter API). In my C++ part I have
implemented the player functions like play, pause, stop and the a getPostion
function. Play, pause and stop is working, but the getPosition function causes
the described seg fault.
 

> 
>  
> 
> > 
> > Cheers
> > -
> > Benjamin Federau
> > 
> > 
> > 
> > --
> > View this message in context:
> > http://gstreamer-devel.966125.n4.nabble.com/QtGStreamer-Segmentation-fault-when-calling-query-function-tp4659657.html
> > Sent from the GStreamer-devel mailing list archive at Nabble.com.
> > _______________________________________________
> > gstreamer-devel mailing list
> > gstreamer-devel at lists.freedesktop.org
> > [mailto:gstreamer-devel at lists.freedesktop.org]
> > http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> > 

> 
> 
>