Hope this helps:

Thread 8 (Thread 0x7fffd4ae8700 (LWP 3965)):
#0  0x00007ffff71e6b03 in __GI___poll (fds=<optimized out>, nfds=<optimized 
out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007ffff0a55ff6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ffff0a5645a in g_main_loop_run () from 
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fffd4aed98b in ?? () from 
/usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so
#4  0x00007ffff0a779a5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ffff76c8e9a in start_thread (arg=0x7fffd4ae8700) at 
pthread_create.c:308
#6  0x00007ffff71f24bd in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7fffe740c700 (LWP 3964)):
#0  __lll_lock_wait () at 
../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:132
#1  0x00007ffff76cb065 in _L_lock_858 () from 
/lib/x86_64-linux-gnu/libpthread.so.0
#2  0x00007ffff76caeba in __pthread_mutex_lock (mutex=0x82c098) at 
pthread_mutex_lock.c:61
#3  0x00007ffff7909826 in playlist_CurrentInput (p_playlist=0x82bf48) at 
playlist/engine.c:314
#4  0x00007ffff293db5a in MainInputManager::customEvent (this=0x7fffd0264d60, 
event=<optimized out>) at input_manager.cpp:1066
#5  0x00007ffff10af4ac in QObject::event(QEvent*) () from 
/usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007ffff15b8894 in QApplicationPrivate::notify_helper(QObject*, QEvent*) 
() from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#7  0x00007ffff15bd713 in QApplication::notify(QObject*, QEvent*) () from 
/usr/lib/x86_64-linux-gnu/libQtGui.so.4
#8  0x00007ffff1095e9c in QCoreApplication::notifyInternal(QObject*, QEvent*) 
() from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#9  0x00007ffff1099c6a in QCoreApplicationPrivate::sendPostedEvents(QObject*, 
int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#10 0x00007ffff10c4f93 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#11 0x00007ffff0a55c9a in g_main_context_dispatch () from 
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007ffff0a56060 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007ffff0a56124 in g_main_context_iteration () from 
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007ffff10c53bf in 
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () 
from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#15 0x00007ffff1660d5e in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#16 0x00007ffff1094c82 in 
QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from 
/usr/lib/x86_64-linux-gnu/libQtCore.so.4
#17 0x00007ffff1094ed7 in 
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from 
/usr/lib/x86_64-linux-gnu/libQtCore.so.4
#18 0x00007ffff1099f67 in QCoreApplication::exec() () from 
/usr/lib/x86_64-linux-gnu/libQtCore.so.4
#19 0x00007ffff291f04e in Thread (obj=0x1296088) at qt4.cpp:529
#20 0x00007ffff76c8e9a in start_thread (arg=0x7fffe740c700) at 
pthread_create.c:308
#21 0x00007ffff71f24bd in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#22 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7fffed0d8700 (LWP 3961)):
#0  0x00007ffff71e6b03 in __GI___poll (fds=<optimized out>, nfds=<optimized 
out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fffe77155a2 in Run (p_intf=<optimized out>) at dbus.c:860
#2  0x00007ffff7905d9a in RunInterface (p_this=<optimized out>) at 
interface/interface.c:229
#3  0x00007ffff76c8e9a in start_thread (arg=0x7fffed0d8700) at 
pthread_create.c:308
#4  0x00007ffff71f24bd in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7ffff7f49700 (LWP 3960)):
#0  __lll_lock_wait () at 
../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:132
#1  0x00007ffff76cb065 in _L_lock_858 () from 
/lib/x86_64-linux-gnu/libpthread.so.0
#2  0x00007ffff76caeba in __pthread_mutex_lock (mutex=0x82c098) at 
pthread_mutex_lock.c:61
#3  0x00007ffff7909826 in playlist_CurrentInput (p_playlist=0x82bf48) at 
playlist/engine.c:314
#4  0x00007fffed91c66f in ItemChange (p_this=0x82bf48, psz_var=<optimized out>, 
oldval=..., newval=..., param=0x12ba818) at notify.c:166
#5  0x00007ffff79722c0 in TriggerCallback (p_this=0x82bf48, p_var=0x82c1f0, 
psz_name=0x7ffff7997964 "item-change", oldval=...) at misc/variables.c:1367
#6  0x00007ffff7972eaf in var_SetChecked (p_this=0x82bf48, 
psz_name=0x7ffff7997964 "item-change", expected_type=<optimized out>, val=...) 
at misc/variables.c:766
#7  0x00007ffff790ecdc in var_SetAddress (ptr=<optimized out>, 
psz_name=0x7ffff7997964 "item-change", p_obj=<optimized out>) at 
../include/vlc_variables.h:291
#8  input_item_changed (p_event=<optimized out>, user_data=<optimized out>) at 
playlist/item.c:183
#9  0x00007ffff796e9d2 in vlc_event_send (p_em=0x125cb18, 
p_event=0x7ffff7f48c60) at misc/events.c:237
#10 0x00007ffff7912df7 in input_item_SetMeta (p_i=0x125ca80, 
meta_type=vlc_meta_NowPlaying, psz_val=0x0) at input/item.c:184
#11 0x00007ffff7929cad in input_item_SetNowPlaying (val=0x0, p_input=0x125ca80) 
at ../include/vlc_input_item.h:226
#12 Create (p_parent=<optimized out>, p_item=0x125ca80, psz_header=<optimized 
out>, b_quick=<optimized out>, p_resource=<optimized out>) at input/input.c:479
#13 0x00007ffff79076f0 in PlayItem (p_item=0x11b1d60, p_playlist=0x82bf48) at 
playlist/thread.c:238
#14 LoopRequest (p_playlist=0x82bf48) at playlist/thread.c:546
#15 Thread (data=0x82bf48) at playlist/thread.c:584
#16 0x00007ffff76c8e9a in start_thread (arg=0x7ffff7f49700) at 
pthread_create.c:308
#17 0x00007ffff71f24bd in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#18 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fffe8327700 (LWP 3959)):
#0  0x00007ffff71e6b03 in __GI___poll (fds=<optimized out>, nfds=<optimized 
out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007ffff0a55ff6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ffff0a5645a in g_main_loop_run () from 
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fffea8db2c6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007ffff0a779a5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ffff76c8e9a in start_thread (arg=0x7fffe8327700) at 
pthread_create.c:308
#6  0x00007ffff71f24bd in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7ffff7fcf700 (LWP 3954)):
#0  __lll_lock_wait () at 
../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:132
#1  0x00007ffff76cb065 in _L_lock_858 () from 
/lib/x86_64-linux-gnu/libpthread.so.0
#2  0x00007ffff76caeba in __pthread_mutex_lock (mutex=0x82c098) at 
pthread_mutex_lock.c:61
#3  0x00007ffff79084fa in playlist_Deactivate (p_playlist=0x82bf48) at 
playlist/thread.c:77
#4  0x00007ffff78f8042 in libvlc_InternalCleanup (p_libvlc=0x605108) at 
libvlc.c:744
#5  0x00007ffff7bc768e in libvlc_release (p_instance=0x605010) at core.c:107
#6  0x00000000004012e5 in main (i_argc=<optimized out>, ppsz_argv=<optimized 
out>) at vlc.c:261

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https://bugs.launchpad.net/bugs/970447

Title:
  vlc freezes when asked to play something

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