Backtrace (with some bits missing) while totem is hanging, it actually
looks like a pulseaudio failure or gstreamer pulseaudio plugin does
something out of order while seeking/playing that makes pulseaudio hang.

#0  pthread_cond_wait@@GLIBC_2.3.2 () at 
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:144
#1  0x00007fbfcc70f180 in pa_threaded_mainloop_wait (m=0x7fbfc8024740) at 
pulse/thread-mainloop.c:206
#2  0x00007fbfcc951504 in gst_pulsering_set_corked 
(pbuf=pbuf@entry=0x7fbfc8028070, corked=corked@entry=1, wait=wait@entry=1) at 
pulsesink.c:1053
#3  0x00007fbfcc952d3a in gst_pulseringbuffer_pause (buf=0x7fbfc8028070) at 
pulsesink.c:1172
#4  0x00007fbff717a65e in ?? () from 
/usr/lib/x86_64-linux-gnu/libgstaudio-1.0.so.0
#5  0x00007fbff717d700 in gst_audio_ring_buffer_pause () from 
/usr/lib/x86_64-linux-gnu/libgstaudio-1.0.so.0
#6  0x00007fbff71967c6 in ?? () from 
/usr/lib/x86_64-linux-gnu/libgstaudio-1.0.so.0
#7  0x00007fbfcc9544f8 in gst_pulsesink_change_state (element=0x7fbfc8025a10, 
transition=GST_STATE_CHANGE_PLAYING_TO_PAUSED) at pulsesink.c:2916
#8  0x00007fbff6c7faec in gst_element_change_state 
(element=element@entry=0x7fbfc8025a10, transition=<optimized out>) at 
gstelement.c:2594
#9  0x00007fbff6c804c1 in gst_element_set_state_func (element=0x7fbfc8025a10, 
state=GST_STATE_PAUSED) at gstelement.c:2550
#10 0x00007fbff6c682ac in gst_bin_element_set_state (next=GST_STATE_PAUSED, 
current=GST_STATE_PLAYING, start_time=1361340000, base_time=6136832000, 
element=0x7fbfc8025a10, bin=0x7fbffb36f700)
    at gstbin.c:2308

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to totem in Ubuntu.
https://bugs.launchpad.net/bugs/1085342

Title:
  Totem window constantly becomes unresponsive with
  gstreamer1.0-pulseaudio installed

Status in “totem” package in Ubuntu:
  Confirmed

Bug description:
  At least so here.
  Best way to see would be to use totem for a while, window usually becomes 
unresponsive fairly soon.
  Possible Test case(s):
  Add a couple of music tracks to the playlist, switch from one to the other & 
back again with next & previous buttons. (may cause lockup

  Close Totem(Videos), re-open & add back the same tracks & or try them from 
the "Movie"
   menu dropdown.
  Usually here they won't  play & or be switchable, ect.

  Add a couple of tracks to playlist, click on track names a few times
  to start playback/switch tracks

  Doesn't seem to matter if totem is started normally (no app menu in
  ubuntu session), with the app menu (Exec=env UBUNTU_MENUPROXY=0 totem)
  or from the sound menu

  With the pulseaudio plugin removed & the gst alsa plugin installed
  totem behaves much better though on very rare occasion will become
  unresponsive.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: totem 3.6.3-0ubuntu1
  ProcVersionSignature: Ubuntu 3.7.0-4.12-generic 3.7.0-rc7
  Uname: Linux 3.7.0-4-generic x86_64
  ApportVersion: 2.6.3-0ubuntu2
  Architecture: amd64
  Date: Sat Dec  1 01:49:22 2012
  InstallationDate: Installed on 2012-10-23 (38 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017)
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: totem
  UpgradeStatus: No upgrade log present (probably fresh install)

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