Application: kdenlive (0.7.7.1)
KDE Platform Version: 4.4.2 (KDE 4.4.2)
Qt Version: 4.6.2
Operating System: Linux 2.6.32-22-generic x86_64
Distribution: Ubuntu 10.04 LTS

-- 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 0x7fea9055c760 (LWP 2299))]

Thread 6 (Thread 0x7fea717e8710 (LWP 2496)):
#0  0x00007fea8d7dfbc9 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fea9016b500 in mlt_consumer_put_frame (this=0x2f29560, frame=0x6224f80) at mlt_consumer.c:456
#2  0x00007fea7389e124 in consumer_thread (arg=<value optimized out>) at consumer_sdl_preview.c:409
#3  0x00007fea8d7da9ca in start_thread () from /lib/libpthread.so.0
#4  0x00007fea8be986cd in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7fea6135f710 (LWP 2537)):
#0  0x00007fea8d7df85c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fea9016b823 in mlt_consumer_rt_frame (this=0x2f29560) at mlt_consumer.c:892
#2  0x00007fea7389bfe8 in consumer_thread (arg=<value optimized out>) at consumer_sdl.c:752
#3  0x00007fea8d7da9ca in start_thread () from /lib/libpthread.so.0
#4  0x00007fea8be986cd in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7fea70fe7710 (LWP 2538)):
[KCrash Handler]
#5  0x00007fea8bde5a75 in raise () from /lib/libc.so.6
#6  0x00007fea8bde95c0 in abort () from /lib/libc.so.6
#7  0x00007fea8bdde941 in __assert_fail () from /lib/libc.so.6
#8  0x00007fea8d7dd43b in pthread_mutex_lock () from /lib/libpthread.so.0
#9  0x00007fea9016bdbc in consumer_read_ahead_thread (arg=<value optimized out>) at mlt_consumer.c:682
#10 0x00007fea8d7da9ca in start_thread () from /lib/libpthread.so.0
#11 0x00007fea8be986cd in clone () from /lib/libc.so.6
#12 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fea637fe710 (LWP 2539)):
#0  0x00007fea8d7df85c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fea7389b163 in sdl_fill_audio (udata=0x2f29560, stream=0x40145c0 "", len=1024) at consumer_sdl.c:307
#2  0x00007fea73608a08 in ?? () from /usr/lib/libSDL-1.2.so.0
#3  0x00007fea73610665 in ?? () from /usr/lib/libSDL-1.2.so.0
#4  0x00007fea73655de9 in ?? () from /usr/lib/libSDL-1.2.so.0
#5  0x00007fea8d7da9ca in start_thread () from /lib/libpthread.so.0
#6  0x00007fea8be986cd in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fea55d61710 (LWP 2540)):
#0  0x00007fea8be8bf53 in poll () from /lib/libc.so.6
#1  0x00007fea873ed29a in ?? () from /usr/lib/libxcb.so.1
#2  0x00007fea873ed7d7 in ?? () from /usr/lib/libxcb.so.1
#3  0x00007fea873eda85 in xcb_writev () from /usr/lib/libxcb.so.1
#4  0x00007fea8af5b6fa in _XSend (dpy=0x335b160, data=0x0, size=<value optimized out>) at ../../src/xcb_io.c:339
#5  0x00007fea8af5b839 in _XReply (dpy=0x7fea55d60a20, rep=0x7fea55d60bd0, extra=0, discard=1) at ../../src/xcb_io.c:457
#6  0x00007fea8af4f2c3 in XSync (dpy=0x335b160, discard=0) at ../../src/Sync.c:48
#7  0x00007fea7363c610 in ?? () from /usr/lib/libSDL-1.2.so.0
#8  0x00007fea7362a19e in SDL_SetCursor () from /usr/lib/libSDL-1.2.so.0
#9  0x00007fea7362fcf7 in SDL_SetVideoMode () from /usr/lib/libSDL-1.2.so.0
#10 0x00007fea7389b9d2 in consumer_play_video (arg=<value optimized out>) at consumer_sdl.c:525
#11 video_thread (arg=<value optimized out>) at consumer_sdl.c:694
#12 0x00007fea8d7da9ca in start_thread () from /lib/libpthread.so.0
#13 0x00007fea8be986cd in clone () from /lib/libc.so.6
#14 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fea9055c760 (LWP 2299)):
#0  0x00007fea8be8bf53 in poll () from /lib/libc.so.6
#1  0x00007fea873ed29a in ?? () from /usr/lib/libxcb.so.1
#2  0x00007fea873ed7d7 in ?? () from /usr/lib/libxcb.so.1
#3  0x00007fea873eda85 in xcb_writev () from /usr/lib/libxcb.so.1
#4  0x00007fea8af5b6fa in _XSend (dpy=0x28cbaf0, data=0x0, size=<value optimized out>) at ../../src/xcb_io.c:339
#5  0x00007fea8af5bc21 in _XEventsQueued (dpy=0x7fff68d19f90, mode=<value optimized out>) at ../../src/xcb_io.c:260
#6  0x00007fea8af4440b in XEventsQueued (dpy=0x28cbaf0, mode=2) at ../../src/Pending.c:44
#7  0x00007fea8cb50697 in x11EventSourcePrepare (s=0x28b8c90, timeout=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:79
#8  0x00007fea8859beb1 in IA__g_main_context_prepare (context=0x28b7920, priority=<value optimized out>) at /build/buildd/glib2.0-2.24.1/glib/gmain.c:2280
#9  0x00007fea8859c318 in g_main_context_iterate (context=0x28b7920, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>)
    at /build/buildd/glib2.0-2.24.1/glib/gmain.c:2571
#10 0x00007fea8859c8fc in IA__g_main_context_iteration (context=0x28b7920, may_block=1) at /build/buildd/glib2.0-2.24.1/glib/gmain.c:2654
#11 0x00007fea8db88513 in QEventDispatcherGlib::processEvents (this=0x289c190, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#12 0x00007fea8cb5046e in QGuiEventDispatcherGlib::processEvents (this=0x7fff68d19f90, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#13 0x00007fea8db5d992 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#14 0x00007fea8db5dd6c in QEventLoop::exec (this=0x7fff68d1a310, flags=) at kernel/qeventloop.cpp:201
#15 0x00007fea8db61aab in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#16 0x0000000000448095 in main (argc=<value optimized out>, argv=<value optimized out>) at /build/buildd/kdenlive-0.7.7.1/src/main.cpp:86

Report to http://kdenlive.org/mantis