rendering hangs

When rendering an AVCHD video in order to burn it to a normal DVD the rendering process hangs after sometimes 44%, sometimes 60%. These results with the same movie. I tried ulimit -S unlimited but to no avail. My version is newer than the already similar reported bugs so I file a new bug. When the process hangs the remaining time increases instead of going down as expected. The process never finishes and no output file is created.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: pitivi 0.15.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
Uname: Linux 3.0.0-13-generic i686
NonfreeKernelModules: wl
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Wed Nov 23 10:55:56 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111011)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: pitivi
UpgradeStatus: No upgrade log present (probably fresh install)