Original commit message from CVS:
do not change caps in middle of stream except on new streams
fixes #139382
+2004-04-07 Thomas Vander Stichele <thomas at apestaart dot org>
+
+ * ext/mad/gstmad.c: (gst_mad_handle_event),
+ (gst_mad_check_caps_reset), (gst_mad_chain),
+ (gst_mad_change_state):
+ only set explicit caps if they haven't been set before for
+ this stream. MPEG-audio sample rate/channels aren't allowed
+ to change in-stream.
+ Fixes #139382
+
2004-04-06 Ronald Bultje <rbultje@ronald.bitfreak.net>
* ext/gnomevfs/gstgnomevfssink.c: (gst_gnomevfssink_base_init),