Could you try with the packages provided by https://launchpad.net/~gstreamer-developers/+archive/ppa ? 0.13.4 is outdated.
** Changed in: pitivi (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/710567 Title: Rendering doesn't start -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs