(gdb) where
#0  0xb7b760d7 in g_string_erase () from /usr/lib/libglib-2.0.so.0
#1  0xb7b76bfd in g_string_sized_new () from /usr/lib/libglib-2.0.so.0
#2  0xb7b76c45 in g_string_new () from /usr/lib/libglib-2.0.so.0
#3  0xb7e62d80 in gst_caps_to_string () from /usr/lib/libgstreamer-0.10.so.0
#4  0xb48e3110 in gst_ffmpegcsp_caps_with_codectype () from /usr/lib/gstreamer-0.10/libgstffmpegcolorspace.so
#5  0xb48e3849 in gst_ffmpegcsp_codectype_to_caps () from /usr/lib/gstreamer-0.10/libgstffmpegcolorspace.so
#6  0xb48e1fce in gst_ffmpegcolorspace_register () from /usr/lib/gstreamer-0.10/libgstffmpegcolorspace.so
#7  0xb722d51f in gst_base_transform_get_type () from /usr/lib/libgstbase-0.10.so.0
#8  0xb722e3e6 in gst_base_transform_get_type () from /usr/lib/libgstbase-0.10.so.0
#9  0xb7e7c8cf in gst_pad_get_element_private () from /usr/lib/libgstreamer-0.10.so.0
#10 0xb7e7fba0 in gst_pad_get_caps () from /usr/lib/libgstreamer-0.10.so.0
#11 0xb7e8177b in gst_pad_peer_get_caps () from /usr/lib/libgstreamer-0.10.so.0
#12 0xb7e9e19a in gst_pad_query_peer_position () from /usr/lib/libgstreamer-0.10.so.0
#13 0xb7e79757 in gst_iterator_fold () from /usr/lib/libgstreamer-0.10.so.0
#14 0xb7e9edf2 in gst_pad_proxy_getcaps () from /usr/lib/libgstreamer-0.10.so.0
#15 0xb7e7c8cf in gst_pad_get_element_private () from /usr/lib/libgstreamer-0.10.so.0
#16 0xb7e81aa0 in gst_pad_link () from /usr/lib/libgstreamer-0.10.so.0
#17 0xb7e9fd77 in gst_element_unlink_pads () from /usr/lib/libgstreamer-0.10.so.0
#18 0xb7ea0fad in gst_element_link_pads () from /usr/lib/libgstreamer-0.10.so.0
#19 0xb7ea1cdd in gst_element_link_pads_filtered () from /usr/lib/libgstreamer-0.10.so.0
#20 0xb7ea1eeb in gst_element_link_filtered () from /usr/lib/libgstreamer-0.10.so.0
#21 0x0804defa in _create_pipeline (obj=0x8074060) at tp-stream-engine.c:1057
#22 0x0804e11e in tp_stream_engine_get_pipeline (obj=0x8074060) at tp-stream-engine.c:1086
#23 0x0804f3cd in bus_async_handler (bus=0x8282170, message=0x8074400, data=0x8074060) at tp-stream-engine.c:892
#24 0xb7e61383 in gst_bus_pop () from /usr/lib/libgstreamer-0.10.so.0
#25 0xb7b5a802 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#26 0xb7b5d7df in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#27 0xb7b5db89 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#28 0x0804c8f3 in main (argc=1, argv=0xbfe902b4) at stream-engine-main.c:310
(gdb)