Qt 5.6.1 from online installer and GStreamer on (K)Ubuntu 16.10 - MediaPlayer sound issue

[Larpon]

Hi all,

I seem to always hit sound issues on Linux when upgrading distributions - no news there I guess :D

However this time the problem seems a bit more Qt specific. I'm using Qt 5.6.1 from the online installers. And sound has worked on Kubuntu 15.10 and 16.04 so far.

I'm using the MediaPlayer QML component imported from QtMultimedia 5.4 to play back an mp3 file.

But I'm getting this error:

GStreamer-CRITICAL **: gst_object_ref_sink: assertion 'GST_IS_OBJECT (object)' failed

This is what I can find of gstreamer related packages installed:

dpkg -l | grep gstreamer

ii  gir1.2-gstreamer-1.0                            1.8.3-1                                     amd64        GObject introspection data for the GStreamer library
ii  gstreamer-qapt                                  3.0.2-0ubuntu3                              amd64        GStreamer plugin to install codecs using QApt
ii  gstreamer0.10-ffmpeg:amd64                      0.10.13-5ubuntu1~vivid                      amd64        FFmpeg plugin for GStreamer
ii  gstreamer0.10-fluendo-mp3:amd64                 0.10.29.debian-1ubuntu1                     amd64        Fluendo mp3 decoder GStreamer 0.10 plugin
rc  gstreamer0.10-plugins-good:amd64                0.10.31-3+nmu4ubuntu2~gcc5.1                amd64        GStreamer plugins from the "good" set
ii  gstreamer1.0-libav:amd64                        1.8.3-1                                     amd64        libav plugin for GStreamer
ii  gstreamer1.0-nice:amd64                         0.1.13-2                                    amd64        ICE library (GStreamer plugin)
ii  gstreamer1.0-plugins-bad:amd64                  1.8.3-1ubuntu1.1                            amd64        GStreamer plugins from the "bad" set
ii  gstreamer1.0-plugins-bad-faad:amd64             1.8.3-1ubuntu1.1                            amd64        GStreamer faad plugin from the "bad" set
ii  gstreamer1.0-plugins-bad-videoparsers:amd64     1.8.3-1ubuntu1.1                            amd64        GStreamer videoparsers plugin from the "bad" set
ii  gstreamer1.0-plugins-base:amd64                 1.8.3-1ubuntu1                              amd64        GStreamer plugins from the "base" set
ii  gstreamer1.0-plugins-good:amd64                 1.8.3-1ubuntu1                              amd64        GStreamer plugins from the "good" set
ii  gstreamer1.0-plugins-ugly:amd64                 1.8.3-1ubuntu1                              amd64        GStreamer plugins from the "ugly" set
ii  gstreamer1.0-plugins-ugly-amr:amd64             1.8.3-1ubuntu1                              amd64        GStreamer plugins from the "ugly" set
ii  gstreamer1.0-pulseaudio:amd64                   1.8.3-1ubuntu1                              amd64        GStreamer plugin for PulseAudio
ii  gstreamer1.0-x:amd64                            1.8.3-1ubuntu1                              amd64        GStreamer plugins for X11 and Pango
ii  libgstreamer-plugins-bad1.0-0:amd64             1.8.3-1ubuntu1.1                            amd64        GStreamer development files for libraries from the "bad" set
ii  libgstreamer-plugins-base0.10-0:amd64           0.10.36-2                                   amd64        GStreamer libraries from the "base" set
rc  libgstreamer-plugins-base0.10-0:i386            0.10.36-2                                   i386         GStreamer libraries from the "base" set
ii  libgstreamer-plugins-base1.0-0:amd64            1.8.3-1ubuntu1                              amd64        GStreamer libraries from the "base" set
ii  libgstreamer-plugins-base1.0-dev                1.8.3-1ubuntu1                              amd64        GStreamer development files for libraries from the "base" set
ii  libgstreamer-plugins-good1.0-0:amd64            1.8.3-1ubuntu1                              amd64        GStreamer development files for libraries from the "good" set
ii  libgstreamer0.10-0:amd64                        0.10.36-1.5ubuntu1                          amd64        Core GStreamer libraries and elements
rc  libgstreamer0.10-0:i386                         0.10.36-1.2ubuntu3                          i386         Core GStreamer libraries and elements
ii  libgstreamer1.0-0:amd64                         1.8.3-1                                     amd64        Core GStreamer libraries and elements
ii  libgstreamer1.0-dev                             1.8.3-1                                     amd64        GStreamer core development files
ii  libqtgstreamer-1.0-0:amd64                      1.2.0-4                                     amd64        C++ bindings library for GStreamer with a Qt-style API
ii  libqtgstreamerui-1.0-0:amd64                    1.2.0-4                                     amd64        QtGStreamerUi library
ii  libreoffice-avmedia-backend-gstreamer           1:5.2.2-0ubuntu2                            amd64        GStreamer backend for LibreOffice
ii  phonon-backend-gstreamer:amd64                  4:4.8.2-0ubuntu2                            amd64        Phonon GStreamer 1.0 backend
ii  phonon-backend-gstreamer-common:amd64           4:4.8.2-0ubuntu2                            amd64        Phonon GStreamer 1.0.x backend icons
ii  phonon4qt5-backend-gstreamer:amd64              4:4.8.2-0ubuntu2                            amd64        Phonon Qt5 GStreamer 1.0 backend
ii  qtgstreamer-declarative:amd64                   1.2.0-4                                     amd64        QML plugins from QtGStreamer

How can I get the mp3 to play again?

Thanks for your help