Pitivi rendering fails to load crasing rendering dialog window

[userDepth]

I'm trying to render three videos together AVI with "AC-3 (ATSC A/52)" audio codec

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: pitivi 0.15.2-0.1ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
Date: Wed Apr 24 18:36:55 2013
InstallationDate: Installed on 2013-03-29 (26 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130328)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: pitivi
UpgradeStatus: No upgrade log present (probably fresh install)

[Thomas Hotz (thotz-deactivatedaccount)]

Can you please give us more details how to reproduce this bug? Thank you very much for reporting!

[userDepth (binarydepth)]

File : Hack - Triumph of The Nerds - The Rise of Accidental Empires (1996) 1of3 (PBS).avi 500 MB

If you download this file and try to convert it with WinFF and I get the following output inside terminal :

avconv version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
  built on Mar 30 2013 22:20:06 with gcc 4.7.2
[mpeg4 @ 0xe92be0] Invalid and inefficient vfw-avi packed B frames detected
Input #0, avi, from '/home/zahory/Videos/Hackers/Hack - Triumph of The Nerds - The Rise of Accidental Empires (1996) 1of3 (PBS).avi':
  Metadata:
    encoder : VirtualDubMod 1.5.10.1 (build 2439/release)
  Duration: 00:50:37.33, start: 0.000000, bitrate: 1380 kb/s
    Stream #0.0: Video: mpeg4 (Advanced Simple Profile), yuv420p, 640x480 [PAR 1:1 DAR 4:3], 29.97 tbr, 29.97 tbn, 29.98 tbc
    Stream #0.1: Audio: ac3, 48000 Hz, stereo, s16, 224 kb/s
Unknown encoder 'libmp3lame'

With Pitivi it is no longer crashing but hangs while Estimating time for rendering.

I'm trying to use Pitivi because I want to merge all 3 videos into one.
I believe the only way to reproduce this bug is to use a AC-3 audio codec in a video file and try to use it in Pitivi.

If you can download the file in the begining and only that one and try it out.