(gdb) bt
#0  __strcat_sse2 () at ../sysdeps/x86_64/multiarch/../strcat.S:65
#1  0x00007fffbf7c0e27 in strcat (__src=0x7fffffffc0e0 "\351\352\222\065", 
    __dest=0xd48a100 "\352\361\351\345|\355Z\275&\217y\202\312\317\367\362\240iB2\225ܒ\036\327\315\346\361`\216K\245>\230\276!\354\311\bm\275\233\vM\020R\322]>\262:D\360\264\260\257٪\"\220\242}\024u\264tW*9\305\004\016\212|\375\304\376\251\267\275z\275墳\032\256g8P}\352\204|ꑤ\267W\375\263\310yL\313\031\177\067\245Ja\023\345S6-Ѹ\241\226ߜ\373\237&\347\270Z[\244\250 \251e>\375P\320z\201u\235\261D\273%S\"7\244\253ʘ\365PWj3N\235\227\034\210\n}8\210n\345\322)\272\335o\266\"\342\001J\213(\377\371\005J)\377\"\215\344\341\\'n\326\333crR\251"...) at /usr/include/x86_64-linux-gnu/bits/string3.h:142
#2  producer_pango_init (filename=<optimized out>) at producer_pango.c:227
#3  0x00007ffff4902d4a in mlt_factory_producer (profile=profile@entry=0xfa3c30, 
    service=service@entry=0x3849ec0 "pango", resource=0x3849ec6) at mlt_factory.c:300
#4  0x00007fffc59fbe6b in create_producer (profile=profile@entry=0xfa3c30, 
    file=file@entry=0xc8e5dd0 "pango:/home/jana/Videos/2015/2015 Kita/2015 Kindergarten Tom/mp4/2015-04-16T20:38:27-DSCF0118.AVI.mp4") at producer_loader.c:79
#5  0x00007fffc59fc204 in producer_loader_init (profile=0xfa3c30, type=<optimized out>, 
    id=0xcd5020 "loader", 
    arg=0xc8e5dd0 "pango:/home/jana/Videos/2015/2015 Kita/2015 Kindergarten Tom/mp4/2015-04-16T20:38:27-DSCF0118.AVI.mp4") at producer_loader.c:221
#6  0x00007ffff4902d4a in mlt_factory_producer (profile=0xfa3c30, service=0xcd5020 "loader", 
    service@entry=0x0, resource=resource@entry=0xc8e5dd0) at mlt_factory.c:300
#7  0x00007fffbfbe9458 in on_end_producer (name=<optimized out>, context=0x55e1bb0)
    at producer_xml.c:564
#8  on_end_element (ctx=<optimized out>, name=<optimized out>) at producer_xml.c:1322
#9  0x00007fffec46102d in xmlParseEndTag1 (ctxt=ctxt@entry=0x4fd82f0, line=line@entry=16)
    at ../../parser.c:8764
#10 0x00007fffec467e5b in xmlParseElement__internal_alias (ctxt=ctxt@entry=0x4fd82f0)
    at ../../parser.c:10183
#11 0x00007fffec467368 in xmlParseContent__internal_alias (ctxt=ctxt@entry=0x4fd82f0)
    at ../../parser.c:9982
#12 0x00007fffec467c03 in xmlParseElement__internal_alias (ctxt=ctxt@entry=0x4fd82f0)
    at ../../parser.c:10155
#13 0x00007fffec468232 in xmlParseDocument__internal_alias (ctxt=ctxt@entry=0x4fd82f0)
    at ../../parser.c:10846
#14 0x00007fffbfbea7af in producer_xml_init (profile=0xfa3c30, servtype=<optimized out>, 
    id=<optimized out>, 
    data=0xc5b36d8 "<?xml version='1.0' encoding='utf-8'?>\n<mlt modified=\"1\" title=\"Anonymous Submission\" version=\"0.9.3\" root=\"/home/jana\" LC_NUMERIC=\"de_DE.UTF-8\">\n <producer in=\"0\" out=\"124551\" id=\"black\">\n  <property"...) at producer_xml.c:1785
#15 0x00007ffff4902d4a in mlt_factory_producer (profile=0xfa3c30, service=0x76a62c "xml-string", 
    resource=0xc5b36d8) at mlt_factory.c:300
#16 0x00007ffff46d50ea in Mlt::Producer::Producer(Mlt::Profile&, char const*, char const*) ()
   from /usr/lib/libmlt++.so.3
#17 0x000000000074177f in Render::setSceneList (this=0x1734ab0, playlist=..., 
    position=position@entry=53188) at /build/buildd/kdenlive-0.9.10/src/renderer.cpp:1330
#18 0x000000000048c64a in KdenliveDoc::setSceneList (this=0x2f000e0)
    at /build/buildd/kdenlive-0.9.10/src/doc/kdenlivedoc.cpp:407
#19 0x00000000005985fd in TrackView::TrackView (this=0xa7a8eb0, doc=<optimized out>, actions=..., 
    ok=0x7fffffffcb8f, parent=<optimized out>)
    at /build/buildd/kdenlive-0.9.10/src/timeline/trackview.cpp:114
#20 0x0000000000713254 in MainWindow::doOpenFile (this=this@entry=0xcd1070, url=..., 
    stale=<optimized out>, stale@entry=0x0) at /build/buildd/kdenlive-0.9.10/src/mainwindow.cpp:2285
#21 0x00000000007143c4 in MainWindow::openFile (this=this@entry=0xcd1070, url=...)
---Type <return> to continue, or q <return> to quit---
    at /build/buildd/kdenlive-0.9.10/src/mainwindow.cpp:2240
#22 0x00000000007147af in MainWindow::openFile (this=0xcd1070)
    at /build/buildd/kdenlive-0.9.10/src/mainwindow.cpp:2149
#23 0x0000000000719fda in MainWindow::qt_static_metacall (_o=0xcd1070, _id=-16160, _a=0x0, 
    _c=<optimized out>) at /build/buildd/kdenlive-0.9.10/build/src/mainwindow.moc:378
#24 0x00007ffff4ca287a in QMetaObject::activate (sender=sender@entry=0x11bcea0, 
    m=m@entry=0x7ffff6129de0 <QAction::staticMetaObject>, 
    local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7fffffffcfb0)
    at kernel/qobject.cpp:3539
#25 0x00007ffff5679a62 in QAction::triggered (this=this@entry=0x11bcea0, _t1=false)
    at .moc/release-shared/moc_qaction.cpp:276
#26 0x00007ffff567b433 in QAction::activate (this=this@entry=0x11bcea0, 
    event=event@entry=QAction::Trigger) at kernel/qaction.cpp:1257
#27 0x00007ffff5aa9509 in QMenuPrivate::activateCausedStack (this=this@entry=0x2a280f0, 
    causedStack=..., action=action@entry=0x11bcea0, action_e=action_e@entry=QAction::Trigger, 
    self=self@entry=true) at widgets/qmenu.cpp:1038
#28 0x00007ffff5aada39 in QMenuPrivate::activateAction (this=0x2a280f0, action=0x11bcea0, 
    action_e=action_e@entry=QAction::Trigger, self=self@entry=true) at widgets/qmenu.cpp:1130
#29 0x00007ffff5ab1405 in QMenu::mouseReleaseEvent (this=this@entry=0x2977880, e=e@entry=
    0x7fffffffd6e0) at widgets/qmenu.cpp:2372
#30 0x00007ffff7a6b665 in KMenu::mouseReleaseEvent (this=0x2977880, e=0x7fffffffd6e0)
    at ../../kdeui/widgets/kmenu.cpp:464
#31 0x00007ffff56cf51a in QWidget::event (this=this@entry=0x2977880, event=event@entry=0x7fffffffd6e0)
    at kernel/qwidget.cpp:8376
#32 0x00007ffff5ab183b in QMenu::event (this=0x2977880, e=0x7fffffffd6e0) at widgets/qmenu.cpp:2481
#33 0x00007ffff567fe2c in QApplicationPrivate::notify_helper (this=this@entry=0xa3ae60, 
    receiver=receiver@entry=0x2977880, e=e@entry=0x7fffffffd6e0) at kernel/qapplication.cpp:4567
#34 0x00007ffff56865dd in QApplication::notify (this=this@entry=0x7fffffffdf00, 
    receiver=receiver@entry=0x2977880, e=e@entry=0x7fffffffd6e0) at kernel/qapplication.cpp:4110
#35 0x00007ffff79b4d1a in KApplication::notify (this=0x7fffffffdf00, receiver=0x2977880, 
    event=0x7fffffffd6e0) at ../../kdeui/kernel/kapplication.cpp:311
#36 0x00007ffff4c8e4dd in QCoreApplication::notifyInternal (this=0x7fffffffdf00, 
    receiver=receiver@entry=0x2977880, event=event@entry=0x7fffffffd6e0)
    at kernel/qcoreapplication.cpp:953
#37 0x00007ffff5685d93 in sendEvent (event=<optimized out>, receiver=<optimized out>)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#38 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x2977880, 
    event=event@entry=0x7fffffffd6e0, alienWidget=alienWidget@entry=0x0, 
    nativeWidget=nativeWidget@entry=0x2977880, 
    buttonDown=buttonDown@entry=0x7ffff6165318 <qt_button_down>, lastMouseReceiver=..., 
    spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:3178
#39 0x00007ffff56fad1c in QETWidget::translateMouseEvent (this=this@entry=0x2977880, 
    event=event@entry=0x7fffffffda30) at kernel/qapplication_x11.cpp:4568
#40 0x00007ffff56fa289 in QApplication::x11ProcessEvent (this=0x7fffffffdf00, 
    event=event@entry=0x7fffffffda30) at kernel/qapplication_x11.cpp:3627
#41 0x00007ffff5721b32 in x11EventSourceDispatch (s=0xa3be40, callback=0x0, user_data=0x0)
    at kernel/qguieventdispatcher_glib.cpp:146
#42 0x00007fffefa92e04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#43 0x00007fffefa93048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#44 0x00007fffefa930ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#45 0x00007ffff4cbb7be in QEventDispatcherGlib::processEvents (this=0xa0fc90, flags=...)
    at kernel/qeventdispatcher_glib.cpp:436
---Type <return> to continue, or q <return> to quit---
#46 0x00007ffff5721be6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...)
    at kernel/qguieventdispatcher_glib.cpp:204
#47 0x00007ffff4c8d0af in QEventLoop::processEvents (this=this@entry=0x7fffffffde00, flags=...)
    at kernel/qeventloop.cpp:149
#48 0x00007ffff4c8d3a5 in QEventLoop::exec (this=this@entry=0x7fffffffde00, flags=...)
    at kernel/qeventloop.cpp:204
#49 0x00007ffff4c92b79 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#50 0x00007ffff567e37c in QApplication::exec () at kernel/qapplication.cpp:3828
#51 0x0000000000456b79 in main (argc=<optimized out>, argv=0x7fffffffe038)
    at /build/buildd/kdenlive-0.9.10/src/main.cpp:92