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 0xb78a89d0 (LWP 23647))]

Thread 2 (Thread 0xb441bb70 (LWP 23842)):
#0  0x00459416 in __kernel_vsyscall ()
#1  0x009530f3 in __lll_lock_wait_private () from /lib/libc.so.6
#2  0x008dd6a4 in _L_lock_6718 () from /lib/libc.so.6
#3  0x008d9d17 in _int_free () from /lib/libc.so.6
#4  0x00a34cb5 in ?? () from /lib/libglib-2.0.so.0
#5  0x00a34f9a in ?? () from /lib/libglib-2.0.so.0
#6  0x00a3513c in ?? () from /lib/libglib-2.0.so.0
#7  0x0077cfaf in __nptl_deallocate_tsd () from /lib/libpthread.so.0
#8  0x0077dac3 in start_thread () from /lib/libpthread.so.0
#9  0x00943dae in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb78a89d0 (LWP 23647)):
[KCrash Handler]
#6  0x00459416 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 0x008d7a42 in malloc_consolidate () from /lib/libc.so.6
#12 0x008d9ea7 in _int_free () from /lib/libc.so.6
#13 0x018606a8 in av_close_input_stream (s=0xb08480f0) at /home/fermin/rpmbuild/BUILD/ffmpeg-20100329/libavformat/utils.c:2412
#14 0x018608ac in av_close_input_file (s=0xb08480f0) at /home/fermin/rpmbuild/BUILD/ffmpeg-20100329/libavformat/utils.c:2448
#15 0x017a745b in producer_avformat_close (this=0x9448f10) at producer_avformat.c:2033
#16 0x0041bb51 in cache_object_close (cache=0x8ffc4e0, object=<value optimized out>, data=0x0) at mlt_cache.c:131
#17 0x0041c0f8 in mlt_cache_close (cache=0x8ffc4e0) at mlt_cache.c:229
#18 0x00409f79 in mlt_property_clear (this=0x8fddd38) at mlt_property.c:107
#19 mlt_property_close (this=0x8fddd38) at mlt_property.c:475
#20 0x0040ab3d in mlt_properties_close (this=0x8fc85d0) at mlt_properties.c:1161
#21 0x00409f79 in mlt_property_clear (this=0x8ffc4a8) at mlt_property.c:107
#22 mlt_property_close (this=0x8ffc4a8) at mlt_property.c:475
#23 0x0040ab3d in mlt_properties_close (this=0x8b17668) at mlt_properties.c:1161
#24 0x004191e5 in mlt_factory_close () at mlt_factory.c:366
#25 0x0089708f in exit () from /lib/libc.so.6
#26 0x0087fbbe in __libc_start_main () from /lib/libc.so.6
#27 0x08077891 in _start ()

Report to http://kdenlive.org/mantis