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[cenwen <eolinwen@xxxxxxxxx>]

Here the backtrace of the segfault when I preview the files until the crash at the first transition
olivier@mediacenter ~/Bazaar/openshot/openshot $ gdb python
GNU gdb (GDB) 7.2-debian
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Reading symbols from /usr/bin/python...(no debugging symbols found)...done.
(gdb) run openshot.py
Starting program: /usr/bin/python openshot.py
[Thread debugging using libthread_db enabled]
--------------------------------
   OpenShot (version 1.3.1~alpha1)
--------------------------------
[New Thread 0x7fffebd34700 (LWP 20235)]
[New Thread 0x7fffd856a700 (LWP 20242)]
state saved
[New Thread 0x7fffd7d69700 (LWP 20243)]
[New Thread 0x7fffd355e700 (LWP 20244)]
[Thread 0x7fffd355e700 (LWP 20244) exited]
[New Thread 0x7fffd355e700 (LWP 20245)]
[New Thread 0x7fffd73b8700 (LWP 20246)]
Not the primary instance of OpenShot. Not starting queue watcher thread.
[Thread 0x7fffd7d69700 (LWP 20243) exited]
[New Thread 0x7fffd7d69700 (LWP 20247)]
[New Thread 0x7fffd64ad700 (LWP 20248)]
[New Thread 0x7fffd42d2700 (LWP 20249)]
project modified:  Opened project
state saved
[Thread 0x7fffd64ad700 (LWP 20248) exited]
[Thread 0x7fffd355e700 (LWP 20245) exited]
[Thread 0x7fffd7d69700 (LWP 20247) exited]
NEW SDL CONSUMER
[Thread 0x7fffd73b8700 (LWP 20246) exited]
[New Thread 0x7fffd73b8700 (LWP 20250)]
[Thread 0x7fffd73b8700 (LWP 20250) exited]
[New Thread 0x7fffd73b8700 (LWP 20251)]
[New Thread 0x7fffd7d69700 (LWP 20252)]
[New Thread 0x7fffd355e700 (LWP 20253)]
[New Thread 0x7fffd64ad700 (LWP 20254)]
Gtk-Message: (for origin information, set GTK_DEBUG): failed to retrieve property `GtkTreeView::odd-row-color' of type `GdkColor' from rc file value "((GString*) 0x15fc320)" of type `GString'
on_tlbPlay_clicked called with self.GtkToolButton
[Thread 0x7fffd42d2700 (LWP 20249) exited]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffd7d69700 (LWP 20252)]
0x00007fffe3b0abba in ?? () from /usr/lib/mlt/libmltcore.so
(gdb) 

Like you can see, it is always the same library who is the responsible.

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https://bugs.launchpad.net/bugs/730268

Title:
  Tests of the 1.3.1 version

Status in OpenShot Video Editor:
  New

Bug description:
  Hi,

  Soon, we will go out a new "small" version, (aka 1.3.1). This version is a maintenance version. 
  I explain : there is none new feature but only the correction of the bugs that we have discovered in since she is out.
  And like we can not all tests, we need our community. 

  Personally, I have found several bugs on my primary tests.

  All this tests are done on a Lucid 10.04 64 bits with the version 0.62
  of MLT.

  * A bug in the length of the project.
  My project have a initial length of 70 mn. 
  It is a DVD recording and after reflection I have done an error in the estimate time. He is more longer than 70 mn.
  It is not a problem like Openshot increase the timeline 's length. In fact, I am blocked around 42 mn. The preview is working same after this date, but the timeline doesn't work, she is stopped at this location.
  I join the screenshots explaining this bug .

  * a bug about the Qt curve theme who is only on KDE and on Marverick. This bug is not produced on Lucid.
  The bug report is here : https://bugs.launchpad.net/bugs/720609