According to the backtrace that's a crash to gstreamer0.10-ffmpeg. Could you do a debug build of that package to get a backtrace?
** Changed in: totem (Ubuntu) Sourcepackagename: totem => gstreamer0.10-ffmpeg -- GStreamer/Totem crashes when seeking in H264 video's https://launchpad.net/bugs/35052 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
