I believe this may be due to thread issues with multi- processor/hyperthreaded machines. I have reproduced errors similar to this with both types of machines and then disabled all the cpus except cpu0 (echo 0 >/sys/devices/system/cpu/cpu1/online) and the problem appears to go away. Could others try this to see if it helps?
I am going to add this same comment to the bug post on the qdvdauthor site. -- qdvdauthor crashes constantly https://launchpad.net/bugs/37943 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
