terminate called after throwing an instance of 'cv::Exception'
  what():  OpenCV(3.4.5-dev) /home/rahul.c/opencv/modules/imgproc/src/color.hpp:255: error: (-2:Unspecified error) in function 'cv::CvtHelper<VScn, VDcn, VDepth, sizePolicy>::CvtHelper(cv::InputArray, cv::OutputArray, int) [with VScn = cv::Set<1>; VDcn = cv::Set<1>; VDepth = cv::Set<0>; cv::SizePolicy sizePolicy = (cv::SizePolicy)1; cv::InputArray = const cv::_InputArray&; cv::OutputArray = const cv::_OutputArray&]'
> Invalid number of channels in input image:
>     'VScn::contains(scn)'
> where
>     'scn' is 3


Thread 1 "dms_qt" received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
51  ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  0x00007fffe7affe97 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007fffe7b01801 in __GI_abort () at abort.c:79
#2  0x00007fffe84f48b7 in __gnu_cxx::__verbose_terminate_handler() () at ../../../../src/libstdc++-v3/libsupc++/vterminate.cc:95
#3  0x00007fffe84faa06 in __cxxabiv1::__terminate(void (*)()) (handler=<optimized out>) at ../../../../src/libstdc++-v3/libsupc++/eh_terminate.cc:47
#4  0x00007fffe84faa41 in std::terminate() () at ../../../../src/libstdc++-v3/libsupc++/eh_terminate.cc:57
#5  0x00007fffe84fac74 in __cxxabiv1::__cxa_throw(void*, std::type_info*, void (*)(void*)) (obj=<optimized out>, tinfo=0x7fffe9b32420 <typeinfo for cv::Exception>, dest=0x7fffe8b564d0 <cv::Exception::~Exception()>) at ../../../../src/libstdc++-v3/libsupc++/eh_throw.cc:95
#6  0x00007fffe8b5767a in cv::error(cv::Exception const&) () at /usr/local/lib/libopencv_core.so.3.4
#7  0x00007fffe8b5c24f in cv::error(int, cv::String const&, char const*, char const*, int) () at /usr/local/lib/libopencv_core.so.3.4
#8  0x00007fffe894b3fa in cv::errorNoReturn(int, cv::String const&, char const*, char const*, int) [clone .constprop.32] () at /usr/local/lib/libopencv_core.so.3.4
#9  0x00007fffe894beea in void cv::detail::check_failed_auto_<int>(int const&, cv::detail::CheckContext const&) () at /usr/local/lib/libopencv_core.so.3.4
#10 0x00007fffe894d082 in  () at /usr/local/lib/libopencv_core.so.3.4
#11 0x00007fffe9d58608 in cv::cvtColorYUV2Gray_420(cv::_InputArray const&, cv::_OutputArray const&) () at /usr/local/lib/libopencv_imgproc.so.3.4
#12 0x00007fffe9d0502c in cv::cvtColor(cv::_InputArray const&, cv::_OutputArray const&, int, int) () at /usr/local/lib/libopencv_imgproc.so.3.4
#13 0x00005555555726ee in VideoFilterRunnable::run(QVideoFrame*, QVideoSurfaceFormat const&, QFlags<QVideoFilterRunnable::RunFlag>) (this=<optimized out>, input=0x5555562e3e18, surfaceFormat=..., flags=...)
    at /home/rahul.c/code/dms_qt/src/videofilterrunnable.cpp:48
#14 0x00007fff9b99913c in QDeclarativeVideoRendererBackend::updatePaintNode(QSGNode*, QQuickItem::UpdatePaintNodeData*) () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5MultimediaQuick.so.5
#15 0x00007fffe762f2a0 in QQuickWindowPrivate::updateDirtyNode(QQuickItem*) () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5Quick.so.5
#16 0x00007fffe762f9bd in QQuickWindowPrivate::updateDirtyNodes() () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5Quick.so.5
#17 0x00007fffe7630b72 in QQuickWindowPrivate::syncSceneGraph() () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5Quick.so.5
#18 0x00007fffe76eafd9 in QQuickRenderControl::sync() () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5Quick.so.5
#19 0x00007ffff7bcbee0 in QQuickWidgetPrivate::render(bool) () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5QuickWidgets.so.5
#20 0x00007ffff7bcbf9e in QQuickWidgetPrivate::renderSceneGraph() () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5QuickWidgets.so.5
#21 0x00007fffed5187bb in QObject::event(QEvent*) () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5Core.so.5
#22 0x00007fffedba9fd3 in QWidget::event(QEvent*) () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5Widgets.so.5
#23 0x00007ffff7bcfacb in QQuickWidget::event(QEvent*) () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5QuickWidgets.so.5
#24 0x00007fffedb6bb3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5Widgets.so.5
#25 0x00007fffedb72d30 in QApplication::notify(QObject*, QEvent*) () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5Widgets.so.5
#26 0x00007fffed4ebe28 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5Core.so.5
#27 0x00007fffed5426a9 in QTimerInfoList::activateTimers() () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5Core.so.5
#28 0x00007fffed542e81 in timerSourceDispatch(_GSource*, int (*)(void*), void*) () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5Core.so.5
#29 0x00007fffe5c91387 in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007fffe5c915c0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007fffe5c9164c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#32 0x00007fffed5431ef in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5Core.so.5
#33 0x00007fffed4ea78a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5Core.so.5
#34 0x00007fffed4f3190 in QCoreApplication::exec() () at /home/rahul.c/Qt5.12.1/5.12.1/gcc_64/lib/libQt5Core.so.5
#35 0x00005555555693f4 in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /home/rahul.c/code/dms_qt/src/main.cpp:40