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[Michal Predotka <mpredotka@xxxxxxxxx>]

Actually Michael was the one who asked me to submit this bug after he tried the code and reproduced the issue :) 
Anyway for now I made some changes to the code so it's more efficient.

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https://bugs.launchpad.net/bugs/1441325

Title:
  Sound plays randomly or not at all

Status in Media Hub:
  Invalid
Status in PulseAudio sound server:
  New
Status in qtmultimedia-opensource-src package in Ubuntu:
  New

Bug description:
  I'm making an simple app. In the app on a click of a button a sound should play. Unfortunately it plays sometimes but mostly not at all. Here's the place in the app code where the sound I want to play is: http://bazaar.launchpad.net/~mpredotka/+junk/pop-that-wrap/view/head:/Bubble.qml#L16
  When I run my app from SDK to my bq phone I get errors like this:
  Debug-helper> Environment: confined
  Debug-helper> Environment initialized, starting the application
  Debug-helper> Executing /usr/bin/qmlscene['/usr/bin/qmlscene', '$@', 'Main.qml']
  shm_open() failed: Permission denied
  process 26220: arguments to dbus_message_new_method_call() were incorrect, assertion "_dbus_check_is_valid_path (path)" failed in file ../../dbus/dbus-message.c line 1266.
  This is normally a bug in some application using the D-Bus library.
  process 26220: arguments to dbus_message_set_auto_start() were incorrect, assertion "message != NULL" failed in file ../../dbus/dbus-message.c line 2951.
  This is normally a bug in some application using the D-Bus library.
  process 26220: arguments to dbus_message_iter_init_append() were incorrect, assertion "message != NULL" failed in file ../../dbus/dbus-message.c line 2348.
  This is normally a bug in some application using the D-Bus library.
  QDBusConnection: error: could not send message to service "org.freedesktop.NetworkManager" path "" interface "org.freedesktop.DBus.Introspectable" member "Introspect": 
  using blocking call!
  Using blocking call!
  process 26220: arguments to dbus_message_new_method_call() were incorrect, assertion "_dbus_check_is_valid_path (path)" failed in file ../../dbus/dbus-message.c line 1266.
  This is normally a bug in some application using the D-Bus library.
  process 26220: arguments to dbus_message_set_auto_start() were incorrect, assertion "message != NULL" failed in file ../../dbus/dbus-message.c line 2951.
  This is normally a bug in some application using the D-Bus library.
  process 26220: arguments to dbus_message_iter_init_append() were incorrect, assertion "message != NULL" failed in file ../../dbus/dbus-message.c line 2348.
  This is normally a bug in some application using the D-Bus library.
  QDBusConnection: error: could not send message to service "org.freedesktop.NetworkManager" path "" interface "org.freedesktop.DBus.Introspectable" member "Introspect": 
  using blocking call!
  Using blocking call!
  UbuntuWindow::handleSurfaceFocusChange(focused=true)
  UbuntuWindow::handleSurfaceResize(width=540, height=919)
  UbuntuClipboard - Got invalid serialized mime data. Ignoring it.
  QSoundEffect(pulseaudio): Error in pulse audio stream
  QSoundEffect(pulseaudio): Error in pulse audio stream
  QSoundEffect(pulseaudio): Error in pulse audio stream
  QSoundEffect(pulseaudio): Error in pulse audio stream

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