Bug 386275

I was changing some metadata in an mp4 file using exiftool and digikam 5.8.0 appimage crashed on regenerating a thumbnail for the mp4 file. This mp4 file can be played properly in digiKam video preview.
openSUSE Tumbleweed KDE

(gdb) bt
#0  0x00007ffff5daa82d in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x000000329e8af8cb in QWaitCondition::wait(QReadWriteLock*, unsigned long) () from /tmp/.mount_a6Va4V/usr/lib/libQt5Core.so.5
#2  0x00007ffff4e66bd3 in QtAV::BlockingQueue<QRunnable*, QQueue>::take() () from /tmp/.mount_a6Va4V/usr/lib/libQtAV.so.1
#3  0x00007ffff4ed4fb8 in QtAV::VideoFrameExtractor::extract() () from /tmp/.mount_a6Va4V/usr/lib/libQtAV.so.1
#4  0x00007ffff66c5a54 in Digikam::VideoThumbnailer::tryExtractVideoFrame (this=this@entry=0xe00e70) at /b/dktemp/digikam-master/core/libs/threadimageio/videothumbnailer.cpp:242
#5  0x00007ffff66c6e23 in Digikam::VideoThumbnailer::slotGetThumbnail (this=0xe00e70, file=..., size=<optimized out>, strip=<optimized out>) at /b/dktemp/digikam-master/core/libs/threadimageio/videothumbnailer.cpp:224
#6  0x000000329eab77fa in QObject::event(QEvent*) () from /tmp/.mount_a6Va4V/usr/lib/libQt5Core.so.5
#7  0x00007fffef7388bc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /tmp/.mount_a6Va4V/usr/lib/libQt5Widgets.so.5
#8  0x00007fffef73fdc0 in QApplication::notify(QObject*, QEvent*) () from /tmp/.mount_a6Va4V/usr/lib/libQt5Widgets.so.5
#9  0x000000329ea8d1c0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /tmp/.mount_a6Va4V/usr/lib/libQt5Core.so.5
#10 0x000000329ea8f6ab in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /tmp/.mount_a6Va4V/usr/lib/libQt5Core.so.5
#11 0x000000329eadd473 in ?? () from /tmp/.mount_a6Va4V/usr/lib/libQt5Core.so.5
#12 0x00007fffed18af97 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#13 0x00007fffed18b1d0 in ?? () from /usr/lib64/libglib-2.0.so.0
#14 0x00007fffed18b25c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#15 0x000000329eadc9a7 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /tmp/.mount_a6Va4V/usr/lib/libQt5Core.so.5
#16 0x000000329ea8b35a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /tmp/.mount_a6Va4V/usr/lib/libQt5Core.so.5
#17 0x000000329ea93a84 in QCoreApplication::exec() () from /tmp/.mount_a6Va4V/usr/lib/libQt5Core.so.5
#18 0x0000000000405a61 in main (argc=1, argv=<optimized out>) at /b/dktemp/digikam-master/core/app/main/main.cpp:285
(gdb)