There is one annoying problem I keep getting with my Phonon application when on the GStreamer backend.
The application is supposed to play a list of video files automatically loading the next file when the previous one is over.
However with the GStreamer backend, the file currently playing stops a few seconds before the actual end of the file and the next one starts playing. This also happens if there is only one file in the list. It stops prematurely.
This happens at runtime and I keep getting the following message:

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Starting /home/aaron/MCA_Progs/WebPhonon-build-desktop-Qt_4_8_1_in_PATH__System__Release/WebPhonon...
   Aborting aboutToFinish handling.
   
   ** (WebPhonon:6604): WARNING **: gstvideo: failed to get caps of pad xvimagesink0:sink


This does not happen when I use the VLC backend. Neither does it happen in DragonPlayer when using the GStreamer backend. What could be the problem?

Which exact version of the backend do you use?

I'm using Phonon 4.7.1 with the GStreamer 0.10 backend from the OpenSUSE repositories. The same thing happens with the Phonon 4.6 and GStreamer 0.10 on Kubuntu 12.04 LTS
The full code is here https://github.com/Zakhrov/WebPhonon.git
The code for going to the next file is:

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connect(med,SIGNAL(aboutToFinish()),this,SLOT(next()));
void MainWindow::next()
{

    this->on_actionFoward_triggered();
}

void MainWindow::on_actionFoward_triggered()
{
    int index=sources.indexOf(med->currentSource())+1;

       if(sources.size()>index)
       {
            med->setCurrentSource(sources.at(index));
            this->on_actionPlay_triggered();
       }
}

replacing the aboutToFinish() signal with the finished() signal takes care of the playback problem but the gstvideo warning still appears

You should upgrade, there is a newer release of the phonon backend that uses the gstreamer 1.x library