Does totem crash or "only" freeze/deadlock? There was a bug in subtitle parsing that broke playback in totem some time ago which is fixed in the newest upstream version (which isn't in dapper).
http://bugzilla.gnome.org/show_bug.cgi?id=343397 ** Changed in: gstreamer0.10 (Ubuntu) Status: Unconfirmed => Needs Info -- totem crashes when playing video with vobsub subtitles https://launchpad.net/bugs/49208 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
