Open a QuickTime 6.x .mov file with totem-xine (totem-gstreamer sucks in terms of speed and compatibility), let it play a bit, and while it's playing click "Open" again to open another file. Totem crashes, reproducibly, EVERY time:

Backtrace was generated from '/opt/gnome/bin/totem'
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Using host libthread_db library "/lib/tls/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1225427264 (LWP 2912)]
[New Thread -1302774864 (LWP 2928)]
[Thread debugging using libthread_db enabled]
[New Thread -1225427264 (LWP 2912)]
[New Thread -1302774864 (LWP 2928)]
[New Thread -1311704144 (LWP 2925)]
[New Thread -1289622608 (LWP 2921)]
[New Thread -1281229904 (LWP 2920)]
[New Thread -1270948944 (LWP 2919)]
[New Thread -1258456144 (LWP 2918)]
[New Thread -1249756240 (LWP 2917)]
[New Thread -1231451216 (LWP 2916)]
[New Thread -1226060880 (LWP 2915)]
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[Thread debugging using libthread_db enabled]
[New Thread -1225427264 (LWP 2912)]
[New Thread -1302774864 (LWP 2928)]
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0xffffe410 in ?? ()
#0 0xffffe410 in ?? ()
#1 0xbfca8fd8 in ?? ()
#2 0x00000000 in ?? ()
#3 0xbfca8fc8 in ?? ()
#4 0xb7d4364b in __waitpid_nocancel () from /lib/tls/libpthread.so.0
#5 0xb7f11055 in libgnomeui_segv_handle () from /opt/gnome/lib/libgnomeui-2.so.0
#6 <signal handler called>
#7 0xb7509f69 in g_type_check_instance_is_a () from /usr/lib/libgobject-2.0.so.0
#8 0xb74f15e6 in g_object_ref () from /usr/lib/libgobject-2.0.so.0
#9 0xb79247ac in gtk_file_chooser_default_add_filter () from /usr/lib/libgtk-x11-2.0.so.0
#10 0xb7916a6d in gtk_file_chooser_add_filter () from /usr/lib/libgtk-x11-2.0.so.0
#11 0xb792936d in delegate_add_filter () from /usr/lib/libgtk-x11-2.0.so.0
#12 0xb7916a6d in gtk_file_chooser_add_filter () from /usr/lib/libgtk-x11-2.0.so.0
#13 0xb792936d in delegate_add_filter () from /usr/lib/libgtk-x11-2.0.so.0
#14 0xb7916a6d in gtk_file_chooser_add_filter () from /usr/lib/libgtk-x11-2.0.so.0
#15 0x0807046b in totem_add_files ()
#16 0x080609d5 in totem_action_open_dialog ()
#17 0x08060a94 in totem_action_open_dialog ()
#18 0xb74fb4ab in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0
#19 0xb74eef19 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#20 0xb74fe8ab in signal_emit_unlocked_R () from /usr/lib/libgobject-2.0.so.0
#21 0xb74ffef0 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#22 0xb7500259 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#23 0xb7a6dd82 in gtk_widget_activate () from /usr/lib/libgtk-x11-2.0.so.0
#24 0xb798d30b in gtk_menu_shell_activate_item () from /usr/lib/libgtk-x11-2.0.so.0
#25 0xb798d628 in gtk_menu_shell_button_release () from /usr/lib/libgtk-x11-2.0.so.0
#26 0xb798336f in gtk_menu_button_release () from /usr/lib/libgtk-x11-2.0.so.0
#27 0xb797d2b0 in _gtk_marshal_BOOLEAN__BOXED () from /usr/lib/libgtk-x11-2.0.so.0
#28 0xb74ee859 in g_type_class_meta_marshal () from /usr/lib/libgobject-2.0.so.0
#29 0xb74eef19 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#30 0xb74fedbe in signal_emit_unlocked_R () from /usr/lib/libgobject-2.0.so.0
#31 0xb74ffc5e in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#32 0xb7500259 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#33 0xb7a6dfa4 in gtk_widget_event_internal () from /usr/lib/libgtk-x11-2.0.so.0
#34 0xb797b6dd in gtk_propagate_event () from /usr/lib/libgtk-x11-2.0.so.0
#35 0xb797bb53 in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
#36 0xb781affa in gdk_event_dispatch () from /usr/lib/libgdk-x11-2.0.so.0
#37 0xb73a2bec in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#38 0xb73a5fbb in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#39 0xb73a6317 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#40 0xb797acf1 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#41 0x0806492c in main ()

Thread 10 (Thread -1226060880 (LWP 2915)):
#0 0xffffe410 in ?? ()
No symbol table info available.
#1 0xb6ebc388 in ?? ()
No symbol table info available.
#2 0xffffffff in ?? ()
No symbol table info available.
#3 0x00000009 in ?? ()
No symbol table info available.
#4 0xb7312e83 in poll () from /lib/tls/libc.so.6
No symbol table info available.
#5 0xb73a5e1c in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#6 0xb73a6317 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#7 0xb74b7f50 in link_io_thread_fn () from /opt/gnome/lib/libORBit-2.so.0
No symbol table info available.
#8 0xb73c0991 in g_thread_create_proxy () from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#9 0xb7d3d2b0 in start_thread () from /lib/tls/libpthread.so.0
No symbol table info available.
#10 0xb731c7ce in clone () from /lib/tls/libc.so.6
No symbol table info available.

Thread 9 (Thread -1231451216 (LWP 2916)):
#0 0xffffe410 in ?? ()
No symbol table info available.
#1 0xb699843c in ?? ()
No symbol table info available.
#2 0x00000009 in ?? ()
No symbol table info available.
#3 0x00000000 in ?? ()
No symbol table info available.
#4 0xb7d3ff4c in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/tls/libpthread.so.0
No symbol table info available.
#5 0xb7d6f667 in metronom_sync_loop () from /usr/lib/libxine.so.1
No symbol table info available.

Thread 8 (Thread -1249756240 (LWP 2917)):
#0 0xffffe410 in ?? ()
No symbol table info available.
#1 0x00000009 in ?? ()
No symbol table info available.
#2 0xb7da2164 in ?? () from /usr/lib/libxine.so.1
No symbol table info available.
#3 0xb58233e4 in ?? ()
No symbol table info available.
#4 0xb7d42ea6 in __nanosleep_nocancel () from /lib/tls/libpthread.so.0
No symbol table info available.
#5 0xb7d9645e in xine_usec_sleep () from /usr/lib/libxine.so.1
No symbol table info available.
#6 0xb58233e4 in ?? ()
No symbol table info available.
#7 0x00000000 in ?? ()
No symbol table info available.
#8 0x00b71dee in ?? ()
No symbol table info available.
#9 0x00000000 in ?? ()
No symbol table info available.
#10 0x00a446b0 in ?? ()
No symbol table info available.
#11 0xb7da2164 in ?? () from /usr/lib/libxine.so.1
No symbol table info available.
#12 0x000003c9 in ?? ()
No symbol table info available.
#13 0x00002a0e in ?? ()
No symbol table info available.
#14 0xb7d7c5c4 in video_out_loop () from /usr/lib/libxine.so.1
No symbol table info available.
#15 0x00000000 in ?? ()
No symbol table info available.

Thread 7 (Thread -1258456144 (LWP 2918)):
#0 0xffffe410 in ?? ()
No symbol table info available.
#1 0xb4fd7298 in ?? ()
No symbol table info available.
#2 0x000f4240 in ?? ()
No symbol table info available.
#3 0x00000001 in ?? ()
No symbol table info available.
#4 0xb7312e83 in poll () from /lib/tls/libc.so.6
No symbol table info available.
#5 0xb6f9bf15 in snd_pcm_wait_nocheck () from /usr/lib/libasound.so.2
No symbol table info available.
#6 0xb6fa305f in snd_pcm_wait () from /usr/lib/libasound.so.2
No symbol table info available.
#7 0xb501d25f in ao_alsa_write () from /usr/lib/xine/plugins/1.1.1/xineplug_ao_out_alsa.so
No symbol table info available.
#8 0xb7d81397 in ao_loop () from /usr/lib/libxine.so.1
No symbol table info available.
#9 0xb4fd8008 in ?? ()
No symbol table info available.
#10 0x00000117 in ?? ()
No symbol table info available.
#11 0x00000000 in ?? ()
No symbol table info available.
#12 0x00000000 in ?? ()
No symbol table info available.
#13 0x00000000 in ?? ()
No symbol table info available.
#14 0xffffe85d in ?? ()
No symbol table info available.
#15 0xffffffff in ?? ()
No symbol table info available.
#16 0x087560ec in ?? ()
No symbol table info available.
#17 0x08756048 in ?? ()
No symbol table info available.
#18 0x087561a4 in ?? ()
No symbol table info available.
#19 0x087743fc in ?? ()
No symbol table info available.
#20 0x087743cc in ?? ()
No symbol table info available.
#21 0xfffffa18 in ?? ()
No symbol table info available.
#22 0xffffffff in ?? ()
No symbol table info available.
#23 0x00001132 in ?? ()
No symbol table info available.
#24 0x00000000 in ?? ()
No symbol table info available.
#25 0x00b84800 in ?? ()
No symbol table info available.
#26 0x00000000 in ?? ()
No symbol table info available.
#27 0x0021d1ba in ?? ()
No symbol table info available.
#28 0x00000000 in ?? ()
No symbol table info available.
#29 0x0017b072 in ?? ()
No symbol table info available.
#30 0x00000000 in ?? ()
No symbol table info available.
#31 0x0000050b in ?? ()
No symbol table info available.
#32 0xb7d47ff4 in ?? () from /lib/tls/libpthread.so.0
No symbol table info available.
#33 0x00000000 in ?? ()
No symbol table info available.
#34 0x003d0f00 in ?? ()
No symbol table info available.
#35 0xb4fd74c8 in ?? ()
No symbol table info available.
#36 0xb7d3d2b0 in start_thread () from /lib/tls/libpthread.so.0
No symbol table info available.
#0 0xffffe410 in ?? ()