(gdb) run
Starting program: /usr/bin/kdenlive 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffdf264700 (LWP 3594)]
[New Thread 0x7fffde658700 (LWP 3595)]
[New Thread 0x7fffdd5f2700 (LWP 3596)]
QWidget::insertAction: Attempt to insert null action
QWidget::insertAction: Attempt to insert null action
[New Thread 0x7fffc0394700 (LWP 3598)]
[New Thread 0x7fffbfb93700 (LWP 3599)]
[New Thread 0x7fffbe390700 (LWP 3600)]
[Thread 0x7fffdd5f2700 (LWP 3596) exited]
[New Thread 0x7fffdd5f2700 (LWP 3618)]
[Thread 0x7fffc0394700 (LWP 3598) exited]
[Thread 0x7fffbfb93700 (LWP 3599) exited]
[New Thread 0x7fffbfb93700 (LWP 3619)]
[New Thread 0x7fffc0394700 (LWP 3620)]
[New Thread 0x7fffbdb8f700 (LWP 3621)]
[New Thread 0x7fffbd38e700 (LWP 3622)]
[New Thread 0x7fffbcb8d700 (LWP 3623)]
[Thread 0x7fffbfb93700 (LWP 3619) exited]
[Thread 0x7fffc0394700 (LWP 3620) exited]
[New Thread 0x7fffc0394700 (LWP 3625)]
[New Thread 0x7fffbfb93700 (LWP 3626)]
[Thread 0x7fffbdb8f700 (LWP 3621) exited]
[Thread 0x7fffbd38e700 (LWP 3622) exited]
[Thread 0x7fffbcb8d700 (LWP 3623) exited]
[Thread 0x7fffc0394700 (LWP 3625) exited]
[Thread 0x7fffbfb93700 (LWP 3626) exited]
kdenlive(3591) Render::checkMaxThreads: // TRACTOR PROBLEM 
[New Thread 0x7fffbfb93700 (LWP 3627)]
[New Thread 0x7fffc0394700 (LWP 3628)]
[Thread 0x7fffbfb93700 (LWP 3627) exited]
[Thread 0x7fffc0394700 (LWP 3628) exited]
[New Thread 0x7fffc0394700 (LWP 3629)]
[New Thread 0x7fffbfb93700 (LWP 3630)]
[New Thread 0x7fffbcb8d700 (LWP 3631)]
[New Thread 0x7fffbd38e700 (LWP 3632)]
[New Thread 0x7fffbdb8f700 (LWP 3633)]
[New Thread 0x7fffa76c4700 (LWP 3635)]
[New Thread 0x7fffa6ec3700 (LWP 3636)]
[New Thread 0x7fffa66c2700 (LWP 3637)]
[New Thread 0x7fffa5ec1700 (LWP 3638)]
[New Thread 0x7fffa56c0700 (LWP 3639)]
[Thread 0x7fffa76c4700 (LWP 3635) exited]
[Thread 0x7fffa66c2700 (LWP 3637) exited]
[Thread 0x7fffa5ec1700 (LWP 3638) exited]
[Thread 0x7fffa56c0700 (LWP 3639) exited]
kdenlive: pthread_mutex_lock.c :62 : __pthread_mutex_lock:  L'assertion « mutex->__data.__owner == 0 » a échoué.

Program received signal SIGABRT, Aborted.
[Switching to Thread 0x7fffa6ec3700 (LWP 3636)]
0x00007ffff2875425 in raise () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) thread apply all bt

Thread 24 (Thread 0x7fffa6ec3700 (LWP 3636)):
#0  0x00007ffff2875425 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007ffff2878b8b in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007ffff286e0ee in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#3  0x00007ffff286e192 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x00007ffff448befb in pthread_mutex_lock ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007ffff48c855b in mlt_properties_get_data () from /usr/lib/libmlt.so.5
#6  0x00007ffff48c8be2 in mlt_properties_get_int () from /usr/lib/libmlt.so.5
#7  0x00007ffff48d332f in mlt_consumer_get_frame () from /usr/lib/libmlt.so.5
#8  0x00007ffff48d36f2 in ?? () from /usr/lib/libmlt.so.5
#9  0x00007ffff4489e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#10 0x00007ffff2932cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#11 0x0000000000000000 in ?? ()

Thread 22 (Thread 0x7fffbdb8f700 (LWP 3633)):
#0  0x00007ffff448dd84 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007fffc5979743 in ?? () from /usr/lib/x86_64-linux-gnu/libavcodec.so.53
#2  0x00007ffff4489e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
---Type <return> to continue, or q <return> to quit---
#3  0x00007ffff2932cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 21 (Thread 0x7fffbd38e700 (LWP 3632)):
#0  0x00007ffff448dd84 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007fffc5979743 in ?? () from /usr/lib/x86_64-linux-gnu/libavcodec.so.53
#2  0x00007ffff4489e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007ffff2932cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 20 (Thread 0x7fffbcb8d700 (LWP 3631)):
#0  0x00007ffff448dd84 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007fffc5979743 in ?? () from /usr/lib/x86_64-linux-gnu/libavcodec.so.53
#2  0x00007ffff4489e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007ffff2932cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 19 (Thread 0x7fffbfb93700 (LWP 3630)):
#0  0x00007ffff448dd84 in pthread_cond_wait@@GLIBC_2.3.2 ()
---Type <return> to continue, or q <return> to quit---
   from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007fffcc13c127 in ?? () from /usr/lib/mlt/libmltsdl.so
#2  0x00007ffff4489e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007ffff2932cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 18 (Thread 0x7fffc0394700 (LWP 3629)):
#0  0x00007ffff448e0fe in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007ffff48d3398 in mlt_consumer_get_frame () from /usr/lib/libmlt.so.5
#2  0x00007ffff48d3c9e in mlt_consumer_rt_frame () from /usr/lib/libmlt.so.5
#3  0x00007fffcc13c930 in ?? () from /usr/lib/mlt/libmltsdl.so
#4  0x00007ffff4489e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007ffff2932cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 8 (Thread 0x7fffdd5f2700 (LWP 3618)):
#0  0x00007ffff448e0fe in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007ffff4b5e43f in QWaitCondition::wait(QMutex*, unsigned long) ()
   from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
---Type <return> to continue, or q <return> to quit---
#2  0x00007ffff4b515bf in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#3  0x00007ffff4b5dfcb in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4  0x00007ffff4489e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007ffff2932cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7fffbe390700 (LWP 3600)):
#0  0x00007ffff2927303 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007fffefed5036 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffefed5164 in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff4c8c3bf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4  0x00007ffff4c5bc82 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#5  0x00007ffff4c5bed7 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007ffff4b5afa7 in QThread::exec() ()
   from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7  0x00007ffff4c3b9ff in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#8  0x00007ffff4b5dfcb in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#9  0x00007ffff4489e9a in start_thread ()
---Type <return> to continue, or q <return> to quit---
   from /lib/x86_64-linux-gnu/libpthread.so.0
#10 0x00007ffff2932cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#11 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fffde658700 (LWP 3595)):
#0  0x00007ffff2927303 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007fffefed5036 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffefed549a in g_main_loop_run ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fffe5b52406 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fffefef69e5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ffff4489e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#6  0x00007ffff2932cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fffdf264700 (LWP 3594)):
#0  0x00007ffff2927303 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007fffefed5036 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffefed549a in g_main_loop_run ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fffdf26998b in ?? ()
   from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so
---Type <return> to continue, or q <return> to quit---
#4  0x00007fffefef69e5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ffff4489e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#6  0x00007ffff2932cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7ffff7faa7c0 (LWP 3591)):
#0  0x00007ffff2927303 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007fffefed5036 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffefed5164 in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff4c8c3bf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4  0x00007ffff56e7d5e in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#5  0x00007ffff4c5bc82 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007ffff4c5bed7 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7  0x00007ffff4c60f67 in QCoreApplication::exec() ()
   from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#8  0x00000000004550cb in ?? ()
#9  0x00007ffff286076d in __libc_start_main ()
   from /lib/x86_64-linux-gnu/libc.so.6
---Type <return> to continue, or q <return> to quit---
#10 0x00000000004556b1 in _start ()

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffbe685700 (LWP 4412)]
0x00007ffff46b1f11 in Mlt::Properties::get(char const*) () from /usr/lib/libmlt++.so.3
(gdb) thread apply all bt

Thread 27 (Thread 0x7fffa5411700 (LWP 4432)):
#0  0x00007ffff448cd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007fffcc13c127 in ?? () from /usr/lib/mlt/libmltsdl.so
#2  0x00007ffff4488e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007ffff2931cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 26 (Thread 0x7fffa4c10700 (LWP 4431)):
#0  0x00007ffff448d0fe in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007ffff48d2588 in mlt_consumer_get_frame () from /usr/lib/libmlt.so.5
#2  0x00007ffff48d2e8e in mlt_consumer_rt_frame () from /usr/lib/libmlt.so.5
#3  0x00007fffcc13c930 in ?? () from /usr/lib/mlt/libmltsdl.so
#4  0x00007ffff4488e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007ffff2931cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 8 (Thread 0x7fffbe685700 (LWP 4412)):
#0  0x00007ffff46b1f11 in Mlt::Properties::get(char const*) () from /usr/lib/libmlt++.so.3
#1  0x000000000047ce70 in ?? ()
#2  0x00000000006b0022 in ?? ()
#3  0x00000000004d7f76 in ?? ()
#4  0x00007ffff4b514f2 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#5  0x00007ffff4b5dfcb in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007ffff4488e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#7  0x00007ffff2931cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#8  0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7fffdd5f1700 (LWP 4405)):
#0  0x00007ffff2926303 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007fffefed4036 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffefed4164 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff4c8c3bf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
---Type <return> to continue, or q <return> to quit---
   from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4  0x00007ffff4c5bc82 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#5  0x00007ffff4c5bed7 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007ffff4b5afa7 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7  0x00007ffff4c3b9ff in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#8  0x00007ffff4b5dfcb in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#9  0x00007ffff4488e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#10 0x00007ffff2931cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#11 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fffde657700 (LWP 4397)):
#0  0x00007ffff2926303 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007fffefed4036 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffefed449a in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fffe5b51406 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fffefef59e5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ffff4488e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#6  0x00007ffff2931cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fffdf263700 (LWP 4396)):
#0  0x00007ffff2926303 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007fffefed4036 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffefed449a in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fffdf26898b in ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so
#4  0x00007fffefef59e5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ffff4488e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#6  0x00007ffff2931cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7ffff7faa7c0 (LWP 4393)):
#0  0x00007ffff33e09d0 in ?? () from /usr/lib/libkdecore.so.5
---Type <return> to continue, or q <return> to quit---
#1  0x00007ffff33db202 in ?? () from /usr/lib/libkdecore.so.5
#2  0x00007ffff33dee07 in ?? () from /usr/lib/libkdecore.so.5
#3  0x00007ffff33dfb94 in KLocalizedString::toString() const () from /usr/lib/libkdecore.so.5
#4  0x00000000006aad44 in ?? ()
#5  0x00007ffff4c76446 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007ffff568fb7b in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#7  0x00007ffff563f894 in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#8  0x00007ffff5644713 in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#9  0x00007ffff79a73f6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#10 0x00007ffff4c5ce9c in QCoreApplication::notifyInternal(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#11 0x00007ffff4c60c6a in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) ()
   from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#12 0x00007ffff4c8bf93 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#13 0x00007fffefed3d53 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007fffefed40a0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007fffefed4164 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007ffff4c8c3bf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#17 0x00007ffff56e7d5e in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#18 0x00007ffff4c5bc82 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#19 0x00007ffff4c5bed7 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#20 0x00007ffff4c60f67 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#21 0x0000000000454f1b in ?? ()
#22 0x00007ffff285f76d in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
#23 0x0000000000455501 in _start ()