I start a new project, and try to import a large video clip (over an hour long, 2.4 Gb, 1920x1080, 29.97 fps), at which point KDEnlive crashes.  I am using Ubuntu 14.04 64 bit version installed on a solid state hard drive, with an extra HDD for saving files.  
Computer specs: 
15 GiB RAM
Intel® Core™ i7-4770K CPU @ 3.50GHz × 8 
Graphics: AMD Radeon HD 7700


Reproducible: Always

Steps to Reproduce:
1.Open KDEnlive
2.Start new project with whichever settings might fit best
3.import large MP4 video clip (over an hour)
4.Program closes unexpectedly

Actual Results:  
dialog box pops up saying KDEnlive has closed unexpectedly, would you like to file a bug report.  I am happy to do so here.

Expected Results:  
import the clip

per the instructions on how to create a KDEnlive bug report, I searched for similar open bugs and did not see any that looked the same.  Then I opened Terminal and opened KDEnlive using the commands suggested, and reproduced the crash.  Here is the information terminal retrieved:

Thread 10 (Thread 0x7fffbd49c700 (LWP 4904)):
#0  0x00007fffd8540f06 in ?? () from /usr/lib/x86_64-linux-gnu/libavcodec.so.54
#1  0x00007fffd854349d in ?? () from /usr/lib/x86_64-linux-gnu/libavcodec.so.54
#2  0x00007fffd882c282 in avcodec_decode_audio4 ()
   from /usr/lib/x86_64-linux-gnu/libavcodec.so.54
#3  0x00007fffd3da6128 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libavformat.so.54
#4  0x00007fffd3daba5b in avformat_find_stream_info ()
   from /usr/lib/x86_64-linux-gnu/libavformat.so.54
#5  0x00007fffd922b1e7 in ?? () from /usr/lib/mlt/libmltavformat.so
#6  0x00007fffd922e8df in producer_avformat_init ()
   from /usr/lib/mlt/libmltavformat.so
#7  0x00007ffff4902d4a in mlt_factory_producer () from /usr/lib/libmlt.so.6
#8  0x00007fffcddfcf97 in ?? () from /usr/lib/mlt/libmltcore.so
#9  0x00007fffcddfd204 in producer_loader_init ()
   from /usr/lib/mlt/libmltcore.so
#10 0x00007ffff4902d4a in mlt_factory_producer () from /usr/lib/libmlt.so.6
#11 0x00007ffff46d5121 in Mlt::Producer::Producer(Mlt::Profile&, char const*, char const*) () from /usr/lib/libmlt++.so.3
#12 0x000000000073aba9 in Render::processFileProperties (this=0x1576a90)
    at /build/buildd/kdenlive-0.9.10/src/renderer.cpp:751
#13 0x00000000004a8a76 in QtConcurrent::RunFunctionTask<void>::run (
---Type <return> to continue, or q <return> to quit---
    this=0x25d0de0) at /usr/include/qt4/QtCore/qtconcurrentrunbase.h:134
#14 0x00007ffff4b7ffee in QThreadPoolThread::run (this=0x2b08410)
    at concurrent/qthreadpool.cpp:108
#15 0x00007ffff4b8c32f in QThreadPrivate::start (arg=0x2b08410)
    at thread/qthread_unix.cpp:349
#16 0x00007ffff44a9182 in start_thread (arg=0x7fffbd49c700)
    at pthread_create.c:312
#17 0x00007ffff2a6a47d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 9 (Thread 0x7fffbdc9d700 (LWP 4903)):
#0  0x00007ffff2a5d12d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fffefb16fe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffefb170ec in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff4cbb7be in QEventDispatcherGlib::processEvents (this=
    0x7fffb00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#4  0x00007ffff4c8d0af in QEventLoop::processEvents (this=this@entry=
    0x7fffbdc9cde0, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007ffff4c8d3a5 in QEventLoop::exec (this=this@entry=0x7fffbdc9cde0, 
    flags=...) at kernel/qeventloop.cpp:204
#6  0x00007ffff4b89c5f in QThread::exec (this=this@entry=0x24fe240)
    at thread/qthread.cpp:537
---Type <return> to continue, or q <return> to quit---
#7  0x00007ffff4c6e823 in QInotifyFileSystemWatcherEngine::run (this=0x24fe240)
    at io/qfilesystemwatcher_inotify.cpp:265
#8  0x00007ffff4b8c32f in QThreadPrivate::start (arg=0x24fe240)
    at thread/qthread_unix.cpp:349
#9  0x00007ffff44a9182 in start_thread (arg=0x7fffbdc9d700)
    at pthread_create.c:312
#10 0x00007ffff2a6a47d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 8 (Thread 0x7fffc5f58700 (LWP 4902)):
#0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fffcd9e4e08 in ?? () from /usr/lib/mlt/libmltsdl.so
#2  0x00007ffff44a9182 in start_thread (arg=0x7fffc5f58700)
    at pthread_create.c:312
#3  0x00007ffff2a6a47d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 7 (Thread 0x7fffbffff700 (LWP 4901)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
#1  0x00007ffff48feb11 in mlt_consumer_get_frame () from /usr/lib/libmlt.so.6
#2  0x00007ffff48ff528 in mlt_consumer_rt_frame () from /usr/lib/libmlt.so.6
---Type <return> to continue, or q <return> to quit---
#3  0x00007fffcd9e5757 in ?? () from /usr/lib/mlt/libmltsdl.so
#4  0x00007ffff44a9182 in start_thread (arg=0x7fffbffff700)
    at pthread_create.c:312
#5  0x00007ffff2a6a47d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7fffe2864700 (LWP 4894)):
#0  0x00007ffff2a5d12d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fffefb16fe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffefb1730a in g_main_loop_run ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fffe7433336 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fffefb3bf05 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ffff44a9182 in start_thread (arg=0x7fffe2864700)
    at pthread_create.c:312
#6  0x00007ffff2a6a47d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7fffe3065700 (LWP 4893)):
#0  0x00007ffff2a5d12d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fffefb16fe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffefb170ec in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#3  0x00007fffe306d1ad in ?? ()
   from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so
#4  0x00007fffefb3bf05 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ffff44a9182 in start_thread (arg=0x7fffe3065700)
    at pthread_create.c:312
#6  0x00007ffff2a6a47d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7ffff7e917c0 (LWP 4889)):
#0  0x00007ffff2a5d12d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fffefb16fe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffefb170ec in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff4cbb7a1 in QEventDispatcherGlib::processEvents (this=0xa0fc90, 
    flags=...) at kernel/qeventdispatcher_glib.cpp:434
#4  0x00007ffff5721bb6 in QGuiEventDispatcherGlib::processEvents (
    this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#5  0x00007ffff4c8d0af in QEventLoop::processEvents (
    this=this@entry=0x7fffffffdcf0, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007ffff4c8d3a5 in QEventLoop::exec (this=this@entry=0x7fffffffdcf0, 
    flags=...) at kernel/qeventloop.cpp:204
#7  0x00007ffff4c92b79 in QCoreApplication::exec ()
    at kernel/qcoreapplication.cpp:1225
---Type <return> to continue, or q <return> to quit---
#8  0x00007ffff567e37c in QApplication::exec () at kernel/qapplication.cpp:3828
#9  0x0000000000456b79 in main (argc=<optimized out>, argv=0x7fffffffdf28)
    at /build/buildd/kdenlive-0.9.10/src/main.cpp:92
(gdb)