(gdb) where
#0  0xb7af7b34 in vasprintf () from /lib/tls/i686/cmov/libc.so.6
#1  0xb7c358b7 in g_vasprintf () from /usr/lib/libglib-2.0.so.0
#2  0xb7c278a6 in g_strdup_vprintf () from /usr/lib/libglib-2.0.so.0
#3  0xb7c278cb in g_strdup_printf () from /usr/lib/libglib-2.0.so.0
#4  0xb7f54f8d in gst_value_can_union () from /usr/lib/libgstreamer-0.10.so.0
#5  0xb7f557ea in gst_value_can_union () from /usr/lib/libgstreamer-0.10.so.0
#6  0xb7f5a5ce in gst_value_serialize () from /usr/lib/libgstreamer-0.10.so.0
#7  0xb7f42b45 in gst_structure_to_string () from /usr/lib/libgstreamer-0.10.so.0
#8  0xb7f14daa in gst_caps_to_string () from /usr/lib/libgstreamer-0.10.so.0
#9  0xb4995110 in gst_ffmpegcsp_caps_with_codectype () from /usr/lib/gstreamer-0.10/libgstffmpegcolorspace.so
#10 0xb4995849 in gst_ffmpegcsp_codectype_to_caps () from /usr/lib/gstreamer-0.10/libgstffmpegcolorspace.so
#11 0xb4993fce in gst_ffmpegcolorspace_register () from /usr/lib/gstreamer-0.10/libgstffmpegcolorspace.so
#12 0xb72df51f in gst_base_transform_get_type () from /usr/lib/libgstbase-0.10.so.0
#13 0xb72e03e6 in gst_base_transform_get_type () from /usr/lib/libgstbase-0.10.so.0
#14 0xb7f2e8cf in gst_pad_get_element_private () from /usr/lib/libgstreamer-0.10.so.0
#15 0xb7f31ba0 in gst_pad_get_caps () from /usr/lib/libgstreamer-0.10.so.0
#16 0xb7f3377b in gst_pad_peer_get_caps () from /usr/lib/libgstreamer-0.10.so.0
#17 0xb7f5019a in gst_pad_query_peer_position () from /usr/lib/libgstreamer-0.10.so.0
#18 0xb7f2b757 in gst_iterator_fold () from /usr/lib/libgstreamer-0.10.so.0
#19 0xb7f50df2 in gst_pad_proxy_getcaps () from /usr/lib/libgstreamer-0.10.so.0
#20 0xb7f2e8cf in gst_pad_get_element_private () from /usr/lib/libgstreamer-0.10.so.0
#21 0xb7f31ba0 in gst_pad_get_caps () from /usr/lib/libgstreamer-0.10.so.0
#22 0xb7f3377b in gst_pad_peer_get_caps () from /usr/lib/libgstreamer-0.10.so.0
#23 0xb72e047e in gst_base_transform_get_type () from /usr/lib/libgstbase-0.10.so.0
#24 0xb7f2e8cf in gst_pad_get_element_private () from /usr/lib/libgstreamer-0.10.so.0
#25 0xb7f33aa0 in gst_pad_link () from /usr/lib/libgstreamer-0.10.so.0
#26 0xb7f51d77 in gst_element_unlink_pads () from /usr/lib/libgstreamer-0.10.so.0
#27 0xb7f52ec8 in gst_element_link_pads () from /usr/lib/libgstreamer-0.10.so.0
#28 0xb7f53d5b in gst_element_link_pads_filtered () from /usr/lib/libgstreamer-0.10.so.0
#29 0xb7f53eeb in gst_element_link_filtered () from /usr/lib/libgstreamer-0.10.so.0
#30 0x0804defa in _create_pipeline (obj=0x8074060) at tp-stream-engine.c:1057
#31 0x0804e11e in tp_stream_engine_get_pipeline (obj=0x8074060) at tp-stream-engine.c:1086
#32 0x0804f3cd in bus_async_handler (bus=0x83a9ec0, message=0x8074260, data=0x8074060) at tp-stream-engine.c:892
#33 0xb7f13383 in gst_bus_pop () from /usr/lib/libgstreamer-0.10.so.0
#34 0xb7c0c802 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#35 0xb7c0f7df in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#36 0xb7c0fb89 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#37 0x0804c8f3 in main (argc=1, argv=0xbffff1a4) at stream-engine-main.c:310
(gdb) c
Continuing.