Application: kdenlive (0.7.8)
KDE Platform Version: 4.4.1 (KDE 4.4.1)
Qt Version: 4.6.2
Operating System: Linux 2.6.32.11-99.fc12.i686 i686
Distribution: "Fedora release 12 (Constantine)"

-- Information about the crash:
<In detail, tell us what you were doing  when the application crashed.>

The crash can be reproduced some of the time.

 -- Backtrace:
Application: Kdenlive (kdenlive), signal: Aborted
[Current thread is 1 (Thread 0xb78349d0 (LWP 21852))]

Thread 3 (Thread 0xb4d1bb70 (LWP 21986)):
#0  0x00cf9416 in __kernel_vsyscall ()
#1  0x00781c45 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x03d770df in consumer_thread (arg=0x949d7e8) at consumer_sdl_preview.c:428
#3  0x0077dab5 in start_thread () from /lib/libpthread.so.0
#4  0x00943dae in clone () from /lib/libc.so.6

Thread 2 (Thread 0xb09ccb70 (LWP 22406)):
[KCrash Handler]
#6  0x00cf9416 in __kernel_vsyscall ()
#7  0x00893a81 in raise () from /lib/libc.so.6
#8  0x0089534a in abort () from /lib/libc.so.6
#9  0x008d13ed in __libc_message () from /lib/libc.so.6
#10 0x008d77f1 in malloc_printerr () from /lib/libc.so.6
#11 0x00409fdc in mlt_property_close (this=0xb3834060) at mlt_property.c:476
#12 0x0040ab3d in mlt_properties_close (this=0xb3834300) at mlt_properties.c:1161
#13 0x00406bed in mlt_frame_close (this=0xb3834300) at mlt_frame.c:776
#14 0x00409f79 in mlt_property_clear (this=0xb3855508) at mlt_property.c:107
#15 mlt_property_close (this=0xb3855508) at mlt_property.c:475
#16 0x0040ab3d in mlt_properties_close (this=0xb383b8c8) at mlt_properties.c:1161
#17 0x00406bed in mlt_frame_close (this=0xb383b8c8) at mlt_frame.c:776
#18 0x03d77e7c in consumer_thread (arg=0x9486260) at consumer_sdl_still.c:583
#19 0x0077dab5 in start_thread () from /lib/libpthread.so.0
#20 0x00943dae in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb78349d0 (LWP 21852)):
#0  0x00cf9416 in __kernel_vsyscall ()
#1  0x009393b6 in poll () from /lib/libc.so.6
#2  0x008410c0 in ?? () from /usr/lib/libxcb.so.1
#3  0x00842d52 in xcb_wait_for_reply () from /usr/lib/libxcb.so.1
#4  0x00b0df76 in _XReply () from /usr/lib/libX11.so.6
#5  0x00b03002 in XTranslateCoordinates () from /usr/lib/libX11.so.6
#6  0x072f07e6 in QWidget::mapFromGlobal(QPoint const&) const () from /usr/lib/libQtGui.so.4
#7  0x072f083c in QWidget::mapFromGlobal(QPoint const&) const () from /usr/lib/libQtGui.so.4
#8  0x07258959 in QApplicationPrivate::pickMouseReceiver(QWidget*, QPoint const&, QPoint&, QEvent::Type, QFlags<Qt::MouseButton>, QWidget*, QWidget*) () from /usr/lib/libQtGui.so.4
#9  0x072d7012 in ?? () from /usr/lib/libQtGui.so.4
#10 0x072d5837 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#11 0x073024fa in ?? () from /usr/lib/libQtGui.so.4
#12 0x00a16fb8 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#13 0x00a1a8e8 in ?? () from /lib/libglib-2.0.so.0
#14 0x00a1aa14 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#15 0x06667e46 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#16 0x073020e6 in ?? () from /usr/lib/libQtGui.so.4
#17 0x0663e2da in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#18 0x0663e61a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#19 0x06640ce7 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#20 0x07253dd8 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#21 0x0807ebad in main ()

Report to http://kdenlive.org/mantis