I can confirm that it was definitely related to my sound setup. As said previously, MPlayer doesn't use surround by default, whereas VLC and totem do, sending the audio through the centre channel.
** Changed in: totem Status: New => Invalid ** Changed in: libdvdnav (Ubuntu) Status: New => Invalid -- dvd playback does not play the dialog audio track https://bugs.launchpad.net/bugs/458054 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs