https://bugs.kde.org/show_bug.cgi?id=379274

            Bug ID: 379274
           Summary: Can't select transition without crash.
           Product: kdenlive
           Version: git-master
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: Effects & Transitions
          Assignee: vpi...@kde.org
          Reporter: daviljoe...@aol.com
  Target Milestone: ---

Application: kdenlive (17.07.70)

Qt Version: 5.8.0
Frameworks Version: 5.33.0
Operating System: Linux 4.10.11-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:

So if I create an affine transition layer, everything works just as expected,
but the instant I do anything that would select the transition, including right
clicking the transition in order to attempt to delete it, Kdenlive crashes,
very suddenly. Only other thing I have to mention is that the preview window
renders a tiny bit before it crashes, and that I can move the playback head
(Not sure exactly what it's called) to right where the affine transition is,
and it renders just fine without crashing, though it still instantly crashes
when I try to select the transition.

-- Backtrace:
Application: Kdenlive (kdenlive), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7ff1bf37f800 (LWP 28094))]

Thread 20 (Thread 0x7ff140f59700 (LWP 28124)):
#0  0x00007ff1b5762756 in pthread_cond_wait@@GLIBC_2.3.2 () at
/usr/lib/libpthread.so.0
#1  0x00007ff16a21e6dd in  () at /usr/lib/mlt/libmltsdl.so
#2  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#3  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 19 (Thread 0x7ff14cac3700 (LWP 28123)):
#0  0x00007ff1b772576b in ppoll () at /usr/lib/libc.so.6
#1  0x00007ff1af2c779d in pa_mainloop_poll () at /usr/lib/libpulse.so.0
#2  0x00007ff1af2c7d8e in pa_mainloop_iterate () at /usr/lib/libpulse.so.0
#3  0x00007ff169fb555d in  () at /usr/lib/libSDL-1.2.so.0
#4  0x00007ff169f8976b in  () at /usr/lib/libSDL-1.2.so.0
#5  0x00007ff169f91e18 in  () at /usr/lib/libSDL-1.2.so.0
#6  0x00007ff169fd2d39 in  () at /usr/lib/libSDL-1.2.so.0
#7  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 18 (Thread 0x7ff1417fa700 (LWP 28117)):
#0  0x00007ff1b5762756 in pthread_cond_wait@@GLIBC_2.3.2 () at
/usr/lib/libpthread.so.0
#1  0x00007ff1be483adb in  () at /usr/lib/libmlt.so.6
#2  0x000000000075218d in  ()
#3  0x00007ff1b812f6d8 in  () at /usr/lib/libQt5Core.so.5
#4  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#5  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 17 (Thread 0x7ff143fff700 (LWP 28116)):
#0  0x00007ff1b5762756 in pthread_cond_wait@@GLIBC_2.3.2 () at
/usr/lib/libpthread.so.0
#1  0x00007ff16a21f0c0 in  () at /usr/lib/mlt/libmltsdl.so
#2  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#3  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 16 (Thread 0x7ff141ffb700 (LWP 28113)):
#0  0x00007ff1b5762756 in pthread_cond_wait@@GLIBC_2.3.2 () at
/usr/lib/libpthread.so.0
#1  0x00007ff1be48bd93 in  () at /usr/lib/libmlt.so.6
#2  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#3  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 15 (Thread 0x7ff1427fc700 (LWP 28112)):
#0  0x00007ff1b5762756 in pthread_cond_wait@@GLIBC_2.3.2 () at
/usr/lib/libpthread.so.0
#1  0x00007ff1be48bd93 in  () at /usr/lib/libmlt.so.6
#2  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#3  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 14 (Thread 0x7ff142ffd700 (LWP 28111)):
#0  0x00007ff1b5762756 in pthread_cond_wait@@GLIBC_2.3.2 () at
/usr/lib/libpthread.so.0
#1  0x00007ff1be48bd93 in  () at /usr/lib/libmlt.so.6
#2  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#3  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 13 (Thread 0x7ff1437fe700 (LWP 28110)):
#0  0x00007ff1b5762756 in pthread_cond_wait@@GLIBC_2.3.2 () at
/usr/lib/libpthread.so.0
#1  0x00007ff1be48bd93 in  () at /usr/lib/libmlt.so.6
#2  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#3  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 12 (Thread 0x7ff14d2c4700 (LWP 28106)):
#0  0x00007ff1b5762b63 in pthread_cond_timedwait@@GLIBC_2.3.2 () at
/usr/lib/libpthread.so.0
#1  0x00007ff1b81304c6 in QWaitCondition::wait(QMutex*, unsigned long) () at
/usr/lib/libQt5Core.so.5
#2  0x00007ff1b812bbc4 in  () at /usr/lib/libQt5Core.so.5
#3  0x00007ff1b812f6d8 in  () at /usr/lib/libQt5Core.so.5
#4  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#5  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 11 (Thread 0x7ff15c83d700 (LWP 28105)):
#0  0x00007ff1af5831e0 in g_mutex_unlock () at /usr/lib/libglib-2.0.so.0
#1  0x00007ff1af53dad6 in g_main_context_iteration () at
/usr/lib/libglib-2.0.so.0
#2  0x00007ff1b835f09b in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/libQt5Core.so.5
#3  0x00007ff1b83088ca in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5Core.so.5
#4  0x00007ff1b812aa73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007ff1b812f6d8 in  () at /usr/lib/libQt5Core.so.5
#6  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7ff15d03e700 (LWP 28104)):
#0  0x00007ff1b772567d in poll () at /usr/lib/libc.so.6
#1  0x00007ff1af53d9b6 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ff1af53dacc in g_main_context_iteration () at
/usr/lib/libglib-2.0.so.0
#3  0x00007ff1b835f09b in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/libQt5Core.so.5
#4  0x00007ff1b83088ca in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5Core.so.5
#5  0x00007ff1b812aa73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007ff1b812f6d8 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7ff15effe700 (LWP 28103)):
#0  0x00007ff1b772567d in poll () at /usr/lib/libc.so.6
#1  0x00007ff1af53d9b6 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ff1af53dacc in g_main_context_iteration () at
/usr/lib/libglib-2.0.so.0
#3  0x00007ff1b835f09b in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/libQt5Core.so.5
#4  0x00007ff1b83088ca in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5Core.so.5
#5  0x00007ff1b812aa73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007ff1b9d5b025 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007ff1b812f6d8 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7ff15f7ff700 (LWP 28102)):
#0  0x00007ff1b5762b63 in pthread_cond_timedwait@@GLIBC_2.3.2 () at
/usr/lib/libpthread.so.0
#1  0x00007ff1b81304c6 in QWaitCondition::wait(QMutex*, unsigned long) () at
/usr/lib/libQt5Core.so.5
#2  0x00007ff1b812bbc4 in  () at /usr/lib/libQt5Core.so.5
#3  0x00007ff1b812f6d8 in  () at /usr/lib/libQt5Core.so.5
#4  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#5  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7ff164f4d700 (LWP 28101)):
#0  0x00007ff1b772567d in poll () at /usr/lib/libc.so.6
#1  0x00007ff1af53d9b6 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ff1af53dacc in g_main_context_iteration () at
/usr/lib/libglib-2.0.so.0
#3  0x00007ff1b835f09b in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/libQt5Core.so.5
#4  0x00007ff1b83088ca in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5Core.so.5
#5  0x00007ff1b812aa73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007ff1b9d5b025 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007ff1b812f6d8 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7ff171a24700 (LWP 28100)):
#0  0x00007ff1b772567d in poll () at /usr/lib/libc.so.6
#1  0x00007ff1781ebd51 in  () at /usr/lib/libusb-1.0.so.0
#2  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#3  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7ff18bfff700 (LWP 28099)):
#0  0x00007ff1b772567d in poll () at /usr/lib/libc.so.6
#1  0x00007ff1af53d9b6 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ff1af53dacc in g_main_context_iteration () at
/usr/lib/libglib-2.0.so.0
#3  0x00007ff1b835f09b in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/libQt5Core.so.5
#4  0x00007ff1b83088ca in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5Core.so.5
#5  0x00007ff1b812aa73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007ff1ba7eb125 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007ff1b812f6d8 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7ff19919a700 (LWP 28098)):
#0  0x00007ff1b772567d in poll () at /usr/lib/libc.so.6
#1  0x00007ff1af53d9b6 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ff1af53dd42 in g_main_loop_run () at /usr/lib/libglib-2.0.so.0
#3  0x00007ff1a08d7ff6 in  () at /usr/lib/libgio-2.0.so.0
#4  0x00007ff1af565295 in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7ff19999b700 (LWP 28097)):
#0  0x00007ff1b772137d in read () at /usr/lib/libc.so.6
#1  0x00007ff1af581e20 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ff1af53d47e in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007ff1af53d954 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007ff1af53dacc in g_main_context_iteration () at
/usr/lib/libglib-2.0.so.0
#5  0x00007ff1af53db11 in  () at /usr/lib/libglib-2.0.so.0
#6  0x00007ff1af565295 in  () at /usr/lib/libglib-2.0.so.0
#7  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7ff1a3f3f700 (LWP 28096)):
#0  0x00007ff1b772567d in poll () at /usr/lib/libc.so.6
#1  0x00007ff1aee808e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007ff1aee82679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007ff1a68c5239 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007ff1b812f6d8 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007ff1b575c2e7 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007ff1b772f54f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7ff1bf37f800 (LWP 28094)):
[KCrash Handler]
#6  0x00007ff1b9373425 in QAction::setEnabled(bool) () at
/usr/lib/libQt5Widgets.so.5
#7  0x000000000065c076 in  ()
#8  0x0000000000637a13 in  ()
#9  0x0000000000618e7e in  ()
#10 0x0000000000534249 in  ()
#11 0x00000000005346ce in  ()
#12 0x00000000008bb3b8 in  ()
#13 0x00007ff1b8335d79 in QMetaObject::activate(QObject*, int, int, void**) ()
at /usr/lib/libQt5Core.so.5
#14 0x00000000008a5358 in  ()
#15 0x000000000056bb4c in  ()
#16 0x000000000059df78 in  ()
#17 0x00007ff1b93bf64f in QWidget::event(QEvent*) () at
/usr/lib/libQt5Widgets.so.5
#18 0x00007ff1b94a6ede in QFrame::event(QEvent*) () at
/usr/lib/libQt5Widgets.so.5
#19 0x00007ff1b96ae1bb in QGraphicsView::viewportEvent(QEvent*) () at
/usr/lib/libQt5Widgets.so.5
#20 0x00007ff1b830a1d1 in
QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () at
/usr/lib/libQt5Core.so.5
#21 0x00007ff1b9377325 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() at /usr/lib/libQt5Widgets.so.5
#22 0x00007ff1b937f8c5 in QApplication::notify(QObject*, QEvent*) () at
/usr/lib/libQt5Widgets.so.5
#23 0x00007ff1b830a470 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() at /usr/lib/libQt5Core.so.5
#24 0x00007ff1b937e0cd in QApplicationPrivate::sendMouseEvent(QWidget*,
QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () at
/usr/lib/libQt5Widgets.so.5
#25 0x00007ff1b93d93e6 in  () at /usr/lib/libQt5Widgets.so.5
#26 0x00007ff1b93dbe03 in  () at /usr/lib/libQt5Widgets.so.5
#27 0x00007ff1b937734c in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() at /usr/lib/libQt5Widgets.so.5
#28 0x00007ff1b937eb61 in QApplication::notify(QObject*, QEvent*) () at
/usr/lib/libQt5Widgets.so.5
#29 0x00007ff1b830a470 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() at /usr/lib/libQt5Core.so.5
#30 0x00007ff1b8857d53 in
QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*)
() at /usr/lib/libQt5Gui.so.5
#31 0x00007ff1b88598c5 in
QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*)
() at /usr/lib/libQt5Gui.so.5
#32 0x00007ff1b883544b in
QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>)
() at /usr/lib/libQt5Gui.so.5
#33 0x00007ff1a69259e0 in  () at /usr/lib/libQt5XcbQpa.so.5
#34 0x00007ff1af53d7b7 in g_main_context_dispatch () at
/usr/lib/libglib-2.0.so.0
#35 0x00007ff1af53da20 in  () at /usr/lib/libglib-2.0.so.0
#36 0x00007ff1af53dacc in g_main_context_iteration () at
/usr/lib/libglib-2.0.so.0
#37 0x00007ff1b835f07f in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/libQt5Core.so.5
#38 0x00007ff1b83088ca in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5Core.so.5
#39 0x00007ff1b8310e14 in QCoreApplication::exec() () at
/usr/lib/libQt5Core.so.5
#40 0x00000000004915ed in  ()
#41 0x00007ff1b7663511 in __libc_start_main () at /usr/lib/libc.so.6
#42 0x0000000000491dfa in _start ()

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