I rebuilt k3b (https://bugs.launchpad.net/ubuntu/+source/k3b/+bug/1686089) and transcode with this patch for Ubuntu 17.04, and that resolved those particular problems.
The k3b bug is a very new one, however this one is from 2014 so I'm wondering that patch hasn't made it into packages yet.
I rebuilt k3b (https:/ /bugs.launchpad .net/ubuntu/ +source/ k3b/+bug/ 1686089) and transcode with this patch for Ubuntu 17.04, and that resolved those particular problems.
The k3b bug is a very new one, however this one is from 2014 so I'm wondering that patch hasn't made it into packages yet.