pitivi crashed with SIGSEGV in gst_mini_object_unref()

[Nicola Jelmorini]

I have set a video file in the timeline, and suddenly Pitivi became gray and then crashes.
The video details are these:

Container = Matroska
video encoder = H.264
audio encoder = AC-3 (ATSC A/52)

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: pitivi 0.93-3
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Sat May 3 17:03:15 2014
ExecutablePath: /usr/bin/pitivi
InstallationDate: Installed on 2014-04-23 (9 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
InterpreterPath: /usr/bin/python2.7
ProcCmdline: python2 /usr/bin/pitivi
ProcEnviron:
 LANGUAGE=it_CH:it
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_CH.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7ff5fc385f00 <gst_mini_object_unref+32>: mov 0x8(%rbx),%eax
 PC (0x7ff5fc385f00) ok
 source "0x8(%rbx)" (0x10000000d) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
 Stack memory exhausted (SP below stack segment)
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: pitivi
StacktraceTop:
 gst_mini_object_unref () from /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
 gst_mini_object_replace () from /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstlibav.so
 ?? () from /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstlibav.so
 ?? () from /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstlibav.so
Title: pitivi crashed with SIGSEGV in gst_mini_object_unref()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 gst_mini_object_unref (mini_object=0x100000005) at gstminiobject.c:442
 gst_mini_object_replace (olddata=olddata@entry=0x7ff5d80fad10, newdata=0x0) at gstminiobject.c:513
 gst_buffer_replace (nbuf=<optimized out>, obuf=0x7ff5d80fad10) at /usr/include/gstreamer-1.0/gst/gstbuffer.h:475
 gst_ffmpegviddec_video_frame (ffmpegdec=ffmpegdec@entry=0x7ff5d8033b90, data=<optimized out>, data@entry=0x7ff5d904f9b0 "", size=<optimized out>, frame=frame@entry=0x7ff5cc293830, ret=ret@entry=0x7ff5dedf759c) at gstavviddec.c:1229
 gst_ffmpegviddec_frame (ffmpegdec=ffmpegdec@entry=0x7ff5d8033b90, data=data@entry=0x7ff5d904f9b0 "", size=size@entry=117918, got_data=got_data@entry=0x7ff5dedf7598, frame=frame@entry=0x7ff5cc293830, ret=ret@entry=0x7ff5dedf759c) at gstavviddec.c:1371