Most computer DVD readers sound like lawn mowers when driven at full speed. This is unfortunately the linux kernel default (data-copy oriented). Therefore any attempt to read a shiny disk will be a noise disaster unless the video app requests limiting the drive to reasonable speeds such as 2× Totem does not do it right now but it should, the code needed is very small, as evidenced on http://safari.iki.fi/speedcontrol.c
You already filed this bug upstream at: http://bugzilla.gnome.org/show_bug.cgi?id=501016 Don't do that...