see upstream report https://bugs.kde.org/show_bug.cgi?id=335111

** Description changed:

  I've been using Kubuntu 16.04 since it was released, and have been using
  Amarok to play MP3s without any issues, until yesterday. After
  installing some updates:
  
  Start-Date: 2017-02-02  13:17:53
  Commandline: apt full-upgrade
  Requested-By: mruffalo (1000)
  Install: linux-image-4.4.0-62-generic:amd64 (4.4.0-62.83, automatic), 
linux-image-extra-4.4.0-62-generic:amd64 (4.4.0-62.83, automatic), 
linux-headers-4.4.0-62:amd64 (4.4.0-62.83, automatic), 
linux-headers-4.4.0-62-generic:amd64 (4.4.0-62.83, automatic)
  Upgrade: linux-headers-generic:amd64 (4.4.0.59.62, 4.4.0.62.65), 
linux-libc-dev:amd64 (4.4.0-59.80, 4.4.0-62.83), libgnutls-openssl27:amd64 
(3.4.10-4ubuntu1.1, 3.4.10-4ubuntu1.2), ntfs-3g:amd64 (1:2015.3.14AR.1-1build1, 
1:2015.3.14AR.1-1ubuntu0.1), linux-image-generic:amd64 (4.4.0.59.62, 
4.4.0.62.65), gstreamer1.0-plugins-good:amd64 (1.8.2-1ubuntu0.3, 
1.8.3-1ubuntu0.3), gstreamer1.0-plugins-base:amd64 (1.8.2-1ubuntu0.2, 
1.8.3-1ubuntu0.1), libgstreamer-plugins-good1.0-0:amd64 (1.8.2-1ubuntu0.3, 
1.8.3-1ubuntu0.3), gstreamer1.0-pulseaudio:amd64 (1.8.2-1ubuntu0.3, 
1.8.3-1ubuntu0.3), libgstreamer-plugins-base1.0-0:amd64 (1.8.2-1ubuntu0.2, 
1.8.3-1ubuntu0.1), gstreamer1.0-x:amd64 (1.8.2-1ubuntu0.2, 1.8.3-1ubuntu0.1), 
gstreamer1.0-libav:amd64 (1.8.2-1~ubuntu1, 1.8.3-1ubuntu0.1), libgnutls30:amd64 
(3.4.10-4ubuntu1.1, 3.4.10-4ubuntu1.2), libxpm4:amd64 (1:3.5.11-1, 
1:3.5.11-1ubuntu0.16.04.1), libgstreamer1.0-0:amd64 (1.8.2-1~ubuntu1, 
1.8.3-1~ubuntu0.1), linux-generic:amd64 (4.4.0.59.62, 4.4.0
 .62.65)
  End-Date: 2017-02-02  13:21:02
  
  Amarok can no longer play MP3 files. I ran Amarok with the --debug
  command-line argument, and this is what happens when I double-click a
  MP3 file in the playlist:
  
- amarok:   BEGIN: void Playlist::Actions::play(const QModelIndex&) 
- amarok:     BEGIN: void Playlist::Actions::play(quint64, bool) 
- amarok:       BEGIN: void EngineController::play(Meta::TrackPtr, uint, bool) 
- amarok:         BEGIN: void EngineController::stop(bool, bool) 
- amarok:         END__: void EngineController::stop(bool, bool) [Took: 0s] 
- amarok:         [EngineController] play: bounded is  QObject(0x0)  current 
"Crystalised (Epicleptic remix)" 
- amarok:         [EngineController] Just a normal, boring track... :-P 
- amarok:         BEGIN: void EngineController::playUrl(const KUrl&, uint, 
bool) 
- amarok:           [EngineController] URL:  KUrl("redacted path to MP3 file") 
"redacted path to MP3 file" 
- amarok:           [EngineController] Offset:  0 
- amarok:         END__: void EngineController::playUrl(const KUrl&, uint, 
bool) [Took: 0s] 
- amarok:       END__: void EngineController::play(Meta::TrackPtr, uint, bool) 
[Took: 0s] 
- amarok:     END__: void Playlist::Actions::play(quint64, bool) [Took: 0s] 
- amarok:   END__: void Playlist::Actions::play(const QModelIndex&) [Took: 0s] 
- amarok: END__: void Playlist::PrettyListView::trackActivated(const 
QModelIndex&) [Took: 0s] 
- amarok: [EngineController] slotTrackLengthChanged( -1 ) 
- amarok: BEGIN: void ProgressWidget::redrawBookmarks(const QString*) 
- amarok: END__: void ProgressWidget::redrawBookmarks(const QString*) [Took: 
0s] 
+ amarok:   BEGIN: void Playlist::Actions::play(const QModelIndex&)
+ amarok:     BEGIN: void Playlist::Actions::play(quint64, bool)
+ amarok:       BEGIN: void EngineController::play(Meta::TrackPtr, uint, bool)
+ amarok:         BEGIN: void EngineController::stop(bool, bool)
+ amarok:         END__: void EngineController::stop(bool, bool) [Took: 0s]
+ amarok:         [EngineController] play: bounded is  QObject(0x0)  current 
"Crystalised (Epicleptic remix)"
+ amarok:         [EngineController] Just a normal, boring track... :-P
+ amarok:         BEGIN: void EngineController::playUrl(const KUrl&, uint, bool)
+ amarok:           [EngineController] URL:  KUrl("redacted path to MP3 file") 
"redacted path to MP3 file"
+ amarok:           [EngineController] Offset:  0
+ amarok:         END__: void EngineController::playUrl(const KUrl&, uint, 
bool) [Took: 0s]
+ amarok:       END__: void EngineController::play(Meta::TrackPtr, uint, bool) 
[Took: 0s]
+ amarok:     END__: void Playlist::Actions::play(quint64, bool) [Took: 0s]
+ amarok:   END__: void Playlist::Actions::play(const QModelIndex&) [Took: 0s]
+ amarok: END__: void Playlist::PrettyListView::trackActivated(const 
QModelIndex&) [Took: 0s]
+ amarok: [EngineController] slotTrackLengthChanged( -1 )
+ amarok: BEGIN: void ProgressWidget::redrawBookmarks(const QString*)
+ amarok: END__: void ProgressWidget::redrawBookmarks(const QString*) [Took: 0s]
  Calling appendChild() on a null node does nothing.
  
  I can play Ogg files without any problems, as I realized when I deleted
  my Amarok configuration and restarted it -- the default playlist
  contains a sample track in Ogg format.

** Bug watch added: KDE Bug Tracking System #335111
   https://bugs.kde.org/show_bug.cgi?id=335111

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https://bugs.launchpad.net/bugs/1661739

Title:
  Amarok can no longer play MP3s after gstreamer update

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