Kubuntu-restricted-extras solves the problem for Kubuntu users, but not for Ubuntu users who have installed ubuntu-restricted-extras, are not satisfied with brasero and then install k3b via gnome-app-install. I know of an Ubuntu user who wanted to change to another distro because "k3b cannot burn mp3s" - he ran exactly into this problem.
Kubuntu- restricted- extras solves the problem for Kubuntu users, but not for Ubuntu users who have installed ubuntu- restricted- extras, are not satisfied with brasero and then install k3b via gnome-app-install. I know of an Ubuntu user who wanted to change to another distro because "k3b cannot burn mp3s" - he ran exactly into this problem.