I experienced the same problem, and was able to work around it by removing phonon-backend-gstreamer.
This after running the following backtrace (gdb) bt #0 pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185 #1 0x00007fa9641b3437 in g_cond_wait () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #2 0x00007fa964195bfb in g_once_init_enter () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #3 0x00007fa936dd75d0 in gst_object_get_type () from /usr/lib/x86_64-linux-gnu/libgstreamer-0.10.so.0 #4 0x00007fa936e1ea25 in gst_registry_get_type () from /usr/lib/x86_64-linux-gnu/libgstreamer-0.10.so.0 #5 0x00007fa936e1ec85 in gst_registry_get_default () from /usr/lib/x86_64-linux-gnu/libgstreamer-0.10.so.0 #6 0x00007fa9370c4aed in ?? () from /usr/lib/x86_64-linux-gnu/qt4/plugins/phonon_backend/phonon_gstreamer.so #7 0x00007fa9370bbf60 in ?? () from /usr/lib/x86_64-linux-gnu/qt4/plugins/phonon_backend/phonon_gstreamer.so #8 0x00007fa9370bc2db in qt_plugin_instance () from /usr/lib/x86_64-linux-gnu/qt4/plugins/phonon_backend/phonon_gstreamer.so #9 0x00007fa96c8d0373 in QPluginLoader::instance() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 ---Type <return> to continue, or q <return> to quit--- #10 0x00007fa94416fc2b in ?? () from /usr/lib/kde4/plugins/phonon_platform/kde.so #11 0x00007fa9441703c7 in ?? () from /usr/lib/kde4/plugins/phonon_platform/kde.so #12 0x00007fa97226cf66 in ?? () from /usr/lib/x86_64-linux-gnu/libphonon.so.4 #13 0x00007fa97226e358 in Phonon::Factory::backend(bool) () from /usr/lib/x86_64-linux-gnu/libphonon.so.4 #14 0x00007fa97226eb23 in ?? () from /usr/lib/x86_64-linux-gnu/libphonon.so.4 #15 0x00007fa972262224 in ?? () from /usr/lib/x86_64-linux-gnu/libphonon.so.4 #16 0x00007fa97225f9c7 in ?? () from /usr/lib/x86_64-linux-gnu/libphonon.so.4 #17 0x00007fa97229af50 in ?? () from /usr/lib/x86_64-linux-gnu/libphonon.so.4 #18 0x00007fa97229b1dc in Phonon::VideoPlayer::mediaObject() const () from /usr/lib/x86_64-linux-gnu/libphonon.so.4 #19 0x00000000006a3cc1 in ?? () #20 0x0000000000695400 in ?? () #21 0x000000000069ca4d in ?? () #22 0x00000000005999fa in ?? () #23 0x00000000005b4308 in ?? () #24 0x0000000000493a11 in ?? () #25 0x00007fa96b940b45 in __libc_start_main (main=0x492bf0, argc=1, argv=0x7fff1cd31dc8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff1cd31db8) at libc-start.c:287 #26 0x000000000049632f in _start ()
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