Bug 379611 - I can't capture video from my webcam
Summary: I can't capture video from my webcam
Status: CONFIRMED
Alias: None
Product: kdenlive
Classification: Applications
Component: Project Bin & Import (other bugs)
Version First Reported In: 20.04.2
Platform: Arch Linux Linux
: NOR wishlist
Target Milestone: ---
Assignee: Jean-Baptiste Mardelle
URL:
Keywords: junior-jobs
Depends on:
Blocks:
 
Reported: 2017-05-07 17:50 UTC by Patrick Silva
Modified: 2024-10-27 09:15 UTC (History)
4 users (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:

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Description Patrick Silva 2017-05-07 17:50:52 UTC 
I'm running kdenlive 17.04 on Arch on my Lenovo laptop with Lenovo EasyCamera.
My webcam works fine with Cheese but I cant cature video using kdenlive, kdenlive turns on my webcam led and shows a frame from the webcam but no video is reocorded, it says "capture failed, check parameters". Capture parameters seem correct.
Comment 1 emohr 2019-01-12 16:41:27 UTC 
It should be fixed in version 18.12.1. And even audio capture should work.

Please try with the current Kdenlive AppImage version 18.12.1b
https://files.kde.org/kdenlive/release/ 

Run the Appimage from the terminal (press CTRL + ALT + T). Move to the AppImage folder and run the .AppImage: ./Kdenlive*.AppImage
Comment 2 Patrick Silva 2019-01-13 00:05:55 UTC 
Still not working.
kdenlive AppImage version 18.12.1b crashes when I stop video recording.
Comment 3 emohr 2019-01-20 14:23:18 UTC 
Could you post a crash log?
Comment 4 Patrick Silva 2019-01-20 14:48:14 UTC 
could you explain how to generate a crash log of appimage please?
Comment 5 emohr 2019-01-20 15:31:43 UTC 
See here: https://kdenlive.org/en/bug-reports/ . 

Scroll down to the bottom to the box "How to get useful crash information (backtrace)"
Comment 6 Patrick Silva 2019-01-21 03:13:57 UTC 
instructions from your link do not wotk with appimage.
However I can reproduce the crash on neon dev unstable.
I'm posting the backtrace if it's helpful.


Thread 27 (Thread 0x7fff6c7f7700 (LWP 4446)):
#0  0x00007fffee51e9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, 
    futex_word=0x7fff7c0084e0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x7fff7c008490, cond=0x7fff7c0084b8)
    at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x7fff7c0084b8, mutex=0x7fff7c008490) at pthread_cond_wait.c:655
#3  0x00007ffff71f95bb in mlt_slices_worker (p=0x7fff7c008480) at mlt_slices.c:95
#4  0x00007fffee5186db in start_thread (arg=0x7fff6c7f7700) at pthread_create.c:463
#5  0x00007ffff01bd88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 25 (Thread 0x7fff6d7f9700 (LWP 4444)):
#0  0x00007fffee51e9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, 
    futex_word=0x7fff7c0084e0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x7fff7c008490, cond=0x7fff7c0084b8)
    at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x7fff7c0084b8, mutex=0x7fff7c008490) at pthread_cond_wait.c:655
#3  0x00007ffff71f95bb in mlt_slices_worker (p=0x7fff7c008480) at mlt_slices.c:95
#4  0x00007fffee5186db in start_thread (arg=0x7fff6d7f9700) at pthread_create.c:463
#5  0x00007ffff01bd88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 23 (Thread 0x7fff6e7fb700 (LWP 4442)):
#0  0x00007fffee51e9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, 
    futex_word=0x7fff7c0084e0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x7fff7c008490, cond=0x7fff7c0084b8)
    at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x7fff7c0084b8, mutex=0x7fff7c008490) at pthread_cond_wait.c:655
#3  0x00007ffff71f95bb in mlt_slices_worker (p=0x7fff7c008480) at mlt_slices.c:95
#4  0x00007fffee5186db in start_thread (arg=0x7fff6e7fb700) at pthread_create.c:463
#5  0x00007ffff01bd88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 21 (Thread 0x7fff6f7fd700 (LWP 4440)):
#0  0x00007fffee51e9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, 
    futex_word=0x7fff7c0084e0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x7fff7c008490, cond=0x7fff7c0084b8)
    at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x7fff7c0084b8, mutex=0x7fff7c008490) at pthread_cond_wait.c:655
#3  0x00007ffff71f95bb in mlt_slices_worker (p=0x7fff7c008480) at mlt_slices.c:95
#4  0x00007fffee5186db in start_thread (arg=0x7fff6f7fd700) at pthread_create.c:463
#5  0x00007ffff01bd88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7fff89abe700 (LWP 4430)):
#0  0x00007ffff01b0bf9 in __GI___poll (fds=0x7fff78004a10, nfds=1, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fffe7c86539 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffe7c8664c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff0e896cf in QEventDispatcherGlib::processEvents (this=0x7fff78000b20, flags=...)
    at kernel/qeventdispatcher_glib.cpp:422
#4  0x00007ffff0e2d9aa in QEventLoop::exec (this=this@entry=0x7fff89abdc60, flags=..., 
    flags@entry=...) at kernel/qeventloop.cpp:214
#5  0x00007ffff0c5925a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:525
#6  0x00007ffff0c6417b in QThreadPrivate::start (arg=0x55555a92f890) at thread/qthread_unix.cpp:367
#7  0x00007fffee5186db in start_thread (arg=0x7fff89abe700) at pthread_create.c:463
#8  0x00007ffff01bd88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7fff8aac0700 (LWP 4428)):
#0  0x00007ffff01b0bf9 in __GI___poll (fds=0x7fff800049b0, nfds=1, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fffe7c86539 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffe7c8664c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff0e896cf in QEventDispatcherGlib::processEvents (this=0x7fff80000b20, flags=...)
    at kernel/qeventdispatcher_glib.cpp:422
#4  0x00007ffff0e2d9aa in QEventLoop::exec (this=this@entry=0x7fff8aabfc60, flags=..., 
    flags@entry=...) at kernel/qeventloop.cpp:214
#5  0x00007ffff0c5925a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:525
#6  0x00007ffff0c6417b in QThreadPrivate::start (arg=0x55555a8f55f0) at thread/qthread_unix.cpp:367
#7  0x00007fffee5186db in start_thread (arg=0x7fff8aac0700) at pthread_create.c:463
#8  0x00007ffff01bd88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fffa9bd6700 (LWP 4423)):
#0  0x00007ffff01b0bf9 in __GI___poll (fds=0x7fffa0004e00, nfds=1, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fffe7c86539 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffe7c8664c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff0e896cf in QEventDispatcherGlib::processEvents (this=0x7fffa0000b20, flags=...)
    at kernel/qeventdispatcher_glib.cpp:422
#4  0x00007ffff0e2d9aa in QEventLoop::exec (this=this@entry=0x7fffa9bd5c40, flags=..., 
    flags@entry=...) at kernel/qeventloop.cpp:214
#5  0x00007ffff0c5925a in QThread::exec (this=this@entry=0x555556e04220) at thread/qthread.cpp:525
#6  0x00007ffff20a54f5 in QQmlThreadPrivate::run (this=0x555556e04220) at qml/ftw/qqmlthread.cpp:148
#7  0x00007ffff0c6417b in QThreadPrivate::start (arg=0x555556e04220) at thread/qthread_unix.cpp:367
#8  0x00007fffee5186db in start_thread (arg=0x7fffa9bd6700) at pthread_create.c:463
#9  0x00007ffff01bd88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fffaaa4a700 (LWP 4422)):
#0  0x00007fffee51eed9 in futex_reltimed_wait_cancelable (private=<optimized out>, 
    reltime=0x7fffaaa49af0, expected=0, futex_word=0x555557069764)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  __pthread_cond_wait_common (abstime=0x7fffaaa49bc0, mutex=0x555557069710, cond=0x555557069738)
    at pthread_cond_wait.c:533
#2  __pthread_cond_timedwait (cond=0x555557069738, mutex=0x555557069710, abstime=0x7fffaaa49bc0)
    at pthread_cond_wait.c:667
#3  0x00007ffff0c64f20 in QWaitConditionPrivate::wait_relative (time=30000, this=0x555557069710)
    at thread/qwaitcondition_unix.cpp:133
#4  QWaitConditionPrivate::wait (time=30000, this=0x555557069710)
    at thread/qwaitcondition_unix.cpp:141
#5  QWaitCondition::wait (this=this@entry=0x5555575d9b30, mutex=mutex@entry=0x5555574599c0, 
    time=30000) at thread/qwaitcondition_unix.cpp:215
#6  0x00007ffff0c5b92d in QThreadPoolThread::run (this=0x5555575d9b20) at thread/qthreadpool.cpp:146
#7  0x00007ffff0c6417b in QThreadPrivate::start (arg=0x5555575d9b20) at thread/qthread_unix.cpp:367
#8  0x00007fffee5186db in start_thread (arg=0x7fffaaa4a700) at pthread_create.c:463
#9  0x00007ffff01bd88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fffaba8b700 (LWP 4420)):
#0  0x00007ffff01b0bf9 in __GI___poll (fds=0x7fffa4004a00, nfds=1, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fffe7c86539 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffe7c8664c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff0e896cf in QEventDispatcherGlib::processEvents (this=0x7fffa4000b20, flags=...)
    at kernel/qeventdispatcher_glib.cpp:422
#4  0x00007ffff0e2d9aa in QEventLoop::exec (this=this@entry=0x7fffaba8ac40, flags=..., 
    flags@entry=...) at kernel/qeventloop.cpp:214
#5  0x00007ffff0c5925a in QThread::exec (this=this@entry=0x555557a14b80) at thread/qthread.cpp:525
#6  0x00007ffff20a54f5 in QQmlThreadPrivate::run (this=0x555557a14b80) at qml/ftw/qqmlthread.cpp:148
#7  0x00007ffff0c6417b in QThreadPrivate::start (arg=0x555557a14b80) at thread/qthread_unix.cpp:367
#8  0x00007fffee5186db in start_thread (arg=0x7fffaba8b700) at pthread_create.c:463
#9  0x00007ffff01bd88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fffd3426700 (LWP 4419)):
#0  0x00007ffff01b0bf9 in __GI___poll (fds=0x7fffcc004db0, nfds=3, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fffe7c86539 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffe7c8664c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff0e896cf in QEventDispatcherGlib::processEvents (this=0x7fffcc000b20, flags=...)
    at kernel/qeventdispatcher_glib.cpp:422
#4  0x00007ffff0e2d9aa in QEventLoop::exec (this=this@entry=0x7fffd3425c30, flags=..., 
    flags@entry=...) at kernel/qeventloop.cpp:214
#5  0x00007ffff0c5925a in QThread::exec (
    this=this@entry=0x7ffff379ad60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>)
    at thread/qthread.cpp:525
#6  0x00007ffff3522e45 in QDBusConnectionManager::run (
    this=0x7ffff379ad60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>)
    at qdbusconnection.cpp:178
#7  0x00007ffff0c6417b in QThreadPrivate::start (
    arg=0x7ffff379ad60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>)
    at thread/qthread_unix.cpp:367
#8  0x00007fffee5186db in start_thread (arg=0x7fffd3426700) at pthread_create.c:463
#9  0x00007ffff01bd88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fffd9a3c700 (LWP 4418)):
#0  0x00007ffff01b0bf9 in __GI___poll (fds=0x7fffd9a3bb68, nfds=1, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fffe73aa747 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fffe73ac36a in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fffdc7f5ed9 in QXcbEventReader::run (this=0x555555dedbf0) at qxcbconnection.cpp:1391
#4  0x00007ffff0c6417b in QThreadPrivate::start (arg=0x555555dedbf0) at thread/qthread_unix.cpp:367
#5  0x00007fffee5186db in start_thread (arg=0x7fffd9a3c700) at pthread_create.c:463
#6  0x00007ffff01bd88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fffddbac700 (LWP 4416)):
#0  0x00007fffee51e9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, 
    futex_word=0x7fffedd98110 <bmalloc::PerProcess<bmalloc::Heap>::s_memory+3120>)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x555555dcccf0, 
    cond=0x7fffedd980e8 <bmalloc::PerProcess<bmalloc::Heap>::s_memory+3080>)
    at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x7fffedd980e8 <bmalloc::PerProcess<bmalloc::Heap>::s_memory+3080>, 
    mutex=0x555555dcccf0) at pthread_cond_wait.c:655
#3  0x00007ffff08e279c in std::condition_variable::wait(std::unique_lock<std::mutex>&) ()
   from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#4  0x00007fffed0aa217 in std::_V2::condition_variable_any::wait<std::unique_lock<bmalloc::Mutex> > ()
    at /usr/include/c++/7/condition_variable:251
#5  std::_V2::condition_variable_any::wait<std::unique_lock<bmalloc::Mutex>, bmalloc::AsyncTask<bmalloc::Heap, void (bmalloc::Heap::*)()>::threadRunLoop()::{lambda()#1}>(std::unique_lock<bmalloc::Mutex>&, bmalloc::AsyncTask<bmalloc::Heap, void (bmalloc::Heap::*)()>::threadRunLoop()::{lambda()#1}) ()
    at /usr/include/c++/7/condition_variable:260
#6  bmalloc::AsyncTask<bmalloc::Heap, void (bmalloc::Heap::*)()>::threadRunLoop ()
    at ../Source/bmalloc/bmalloc/AsyncTask.h:126
#7  0x00007fffed0aa359 in bmalloc::AsyncTask<bmalloc::Heap, void (bmalloc::Heap::*)()>::threadEntryPoint () at ../Source/bmalloc/bmalloc/AsyncTask.h:106
#8  0x00007ffff08e857f in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#9  0x00007fffee5186db in start_thread (arg=0x7fffddbac700) at pthread_create.c:463
#10 0x00007ffff01bd88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7ffff7f9e640 (LWP 4412)):
#0  0x00007ffff6fc435e in Mlt::Consumer::is_stopped() () from /usr/lib/x86_64-linux-gnu/libmlt++.so.3
#1  0x00005555559e07ec in Render::setProducer (this=0x55555745a900, producer=producer@entry=0x0, 
    position=position@entry=-1, isActive=true) at ./src/renderer.cpp:385
#2  0x00005555558c14b9 in Monitor::slotOpenClip (this=0x5555578b29f0, controller=<optimized out>, 
    in=-1, out=-1) at ./src/monitor/monitor.cpp:1431
#3  0x00005555558c15ee in Monitor::stopCapture (this=0x5555578b29f0) at ./src/monitor/monitor.cpp:2104
#4  0x00005555558ce28e in RecManager::slotRecord (this=0x555556d14840, record=<optimized out>)
    at ./src/monitor/recmanager.cpp:206
#5  0x00007ffff0e5e82f in QtPrivate::QSlotObjectBase::call (a=0x7fffffffcfd0, r=0x555556d14840, 
    this=0x555557880640) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:376
#6  QMetaObject::activate (sender=sender@entry=0x555557a5cd40, signalOffset=<optimized out>, 
    local_signal_index=local_signal_index@entry=4, argv=argv@entry=0x7fffffffcfd0)
    at kernel/qobject.cpp:3754
#7  0x00007ffff0e5ede7 in QMetaObject::activate (sender=sender@entry=0x555557a5cd40, 
    m=m@entry=0x7ffff328f840 <QAction::staticMetaObject>, 
    local_signal_index=local_signal_index@entry=4, argv=argv@entry=0x7fffffffcfd0)
    at kernel/qobject.cpp:3633
#8  0x00007ffff2bbe732 in QAction::toggled (this=this@entry=0x555557a5cd40, _t1=<optimized out>, 
    _t1@entry=false) at .moc/moc_qaction.cpp:389
#9  0x00007ffff2bc0bdc in QAction::setChecked (this=0x555557a5cd40, b=<optimized out>)
    at kernel/qaction.cpp:982
#10 0x00007ffff2bc0cc8 in QAction::activate (this=0x555557a5cd40, event=<optimized out>)
    at kernel/qaction.cpp:1163
#11 0x00007ffff2cab53b in QAbstractButtonPrivate::click (this=0x555557514d80)
    at widgets/qabstractbutton.cpp:397
#12 0x00007ffff2cab79d in QAbstractButton::mouseReleaseEvent (this=0x5555579e3890, e=0x7fffffffd4e0)
    at widgets/qabstractbutton.cpp:1011
#13 0x00007ffff2d9a3da in QToolButton::mouseReleaseEvent (this=<optimized out>, e=<optimized out>)
    at widgets/qtoolbutton.cpp:622
#14 0x00007ffff2c03a98 in QWidget::event (this=0x5555579e3890, event=0x7fffffffd4e0)
    at kernel/qwidget.cpp:9287
#15 0x00007ffff2cac96b in QAbstractButton::event (this=this@entry=0x5555579e3890, 
    e=e@entry=0x7fffffffd4e0) at widgets/qabstractbutton.cpp:968
#16 0x00007ffff2d9a474 in QToolButton::event (this=0x5555579e3890, event=0x7fffffffd4e0)
    at widgets/qtoolbutton.cpp:985
#17 0x00007ffff2bc4e1c in QApplicationPrivate::notify_helper (this=this@entry=0x555555dad680, 
    receiver=receiver@entry=0x5555579e3890, e=e@entry=0x7fffffffd4e0) at kernel/qapplication.cpp:3727
#18 0x00007ffff2bccf87 in QApplication::notify (this=<optimized out>, receiver=0x5555579e3890, 
    e=0x7fffffffd4e0) at kernel/qapplication.cpp:3203
#19 0x00007ffff0e2f688 in QCoreApplication::notifyInternal2 (receiver=receiver@entry=0x5555579e3890, 
    event=event@entry=0x7fffffffd4e0) at kernel/qcoreapplication.cpp:1048
#20 0x00007ffff2bcb8d2 in QCoreApplication::sendEvent (event=<optimized out>, 
    receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:234
#21 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x5555579e3890, 
    event=event@entry=0x7fffffffd4e0, alienWidget=alienWidget@entry=0x5555579e3890, 
    nativeWidget=0x5555578b29f0, buttonDown=buttonDown@entry=0x7ffff32be850 <qt_button_down>, 
    lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:2695
#22 0x00007ffff2c1ec13 in QWidgetWindow::handleMouseEvent (this=this@entry=0x5555574abcb0, 
    event=event@entry=0x7fffffffd8e0) at kernel/qwidgetwindow.cpp:658
#23 0x00007ffff2c21229 in QWidgetWindow::event (this=0x5555574abcb0, event=0x7fffffffd8e0)
    at kernel/qwidgetwindow.cpp:280
#24 0x00007ffff2bc4e1c in QApplicationPrivate::notify_helper (this=this@entry=0x555555dad680, 
    receiver=receiver@entry=0x5555574abcb0, e=e@entry=0x7fffffffd8e0) at kernel/qapplication.cpp:3727
#25 0x00007ffff2bcc3ef in QApplication::notify (this=0x7fffffffdc60, receiver=0x5555574abcb0, 
    e=0x7fffffffd8e0) at kernel/qapplication.cpp:3486
#26 0x00007ffff0e2f688 in QCoreApplication::notifyInternal2 (receiver=receiver@entry=0x5555574abcb0, 
    event=event@entry=0x7fffffffd8e0) at kernel/qcoreapplication.cpp:1048
#27 0x00007ffff13c07bb in QCoreApplication::sendSpontaneousEvent (event=0x7fffffffd8e0, 
    receiver=0x5555574abcb0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:237
#28 QGuiApplicationPrivate::processMouseEvent (e=0x7fff3c016070) at kernel/qguiapplication.cpp:2082
#29 0x00007ffff13c2335 in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x7fff3c016070)
    at kernel/qguiapplication.cpp:1817
#30 0x00007ffff139af5b in QWindowSystemInterface::sendWindowSystemEvents (flags=...)
    at kernel/qwindowsysteminterface.cpp:1032
#31 0x00007fffdc88176b in QPAEventDispatcherGlib::processEvents (this=0x555555e17f20, flags=...)
    at qeventdispatcher_glib.cpp:70
#32 0x00007ffff0e2d9aa in QEventLoop::exec (this=this@entry=0x7fffffffdb50, flags=..., 
    flags@entry=...) at kernel/qeventloop.cpp:214
#33 0x00007ffff0e36b70 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1336
#34 0x0000555555609857 in main (argc=<optimized out>, argv=<optimized out>) at ./src/main.cpp:179
Comment 7 Patrick Silva 2019-04-23 12:04:06 UTC 
Has the webcam video recording feature been removed from Kdenlive 19.04?
I can't find it.
Comment 8 emohr 2019-04-23 15:42:41 UTC 
Screen grab is in 19.04 a bit hidden. Goto view -> tick “screen grab”.
Comment 9 Patrick Silva 2019-04-28 00:59:11 UTC 
Thanks emohr.
Unfortunately I can't record a video with my webcam yet.
Kdenlive not even detects my device.
Comment 10 Patrick Silva 2020-06-14 01:29:34 UTC 
was webcam video capture feature removed from newer kdenlive versions?
I can't find it.
Comment 11 emohr 2020-06-14 12:38:39 UTC 
Webcam capture is not re-implemented so far https://invent.kde.org/multimedia/kdenlive/-/issues/668.