I can confirm this with totem-gstreamer-firefox-plugin 1.4.0-0ubuntu3 and x86 version.
** Changed in: totem-gstreamer-firefox-plugin (Ubuntu) Status: Unconfirmed => Confirmed -- ogg theora videos won't play https://launchpad.net/bugs/34948 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs