After update to gstreamer-1.2, I am unable to access pmt, eit, tot and other message contents from python. I use this code:

    def on_message(self, bus, msg):
        msgs = msg.get_structure()
        msgn = msgs.get_name()
        if msgn=="pmt":
          print msgs.to_string()
          # process message

In gst-1.0 result is:
pmt, program-number=(uint)36, pcr-pid=(uint)561, version-number=(uint)11, streams=(structure){ "pid-511\,\ pid\=\(uint\)511\,\ stream-type\=\(uint\)3\,\ lang-code\=\(string\)CZE\,\ descriptors\=\(GValueArray\)NULL\;", "pid-521\,\ pid\=\(uint\)521\,\ stream-type\=\(uint\)6\,\ descriptors\=\(GValueArray\)NULL\;", "pid-561\,\ pid\=\(uint\)561\,\ stream-type\=\(uint\)2\,\ descriptors\=\(GValueArray\)NULL\;" };

In gst-1.2 result is:
pmt, section=(GstMpegTsSection)NULL;

In gst-1.0 I can parse this string and get required information (program number, description, time offsets, ...
In gst-1.2 this ability is broken. Even if I am trying to use msgs.get_value("section") I get only an GstMpegTsSection object, which is an gobject.GBoxed object and has only ability to copy or free it. :-(

I am not sure, if this is a gst-python problem but looks like this structure is NULL and there is nothing to get in any programming language.