Seems like a bug in the gnome part controlling pulseaudio, but not like a vlc issue. Re-assigning to gnome since I don't know a better place for this bug.
** Package changed: vlc (Ubuntu) => meta-gnome3 (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1789101 Title: vlc does not play sound on mp4 files To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/meta-gnome3/+bug/1789101/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs