After printing:
GStreamer:ERROR:gstcaps.c:1370:gst_caps_subtract: assertion failed: (subtrahend->structs->len > 0)

GNU GDB shows:

Program received signal SIGABRT, Aborted.
[Switching to Thread 0x45ded950 (LWP 26386)]
0x00007f2f50f65fd5 in raise () from /lib/libc.so.6
(gdb) bt
#0  0x00007f2f50f65fd5 in raise () from /lib/libc.so.6
#1  0x00007f2f50f67b43 in abort () from /lib/libc.so.6
#2  0x00007f2f519a9d83 in g_assertion_message () from /usr/lib/libglib-2.0.so.0
#3  0x00007f2f519aa222 in g_assertion_message_expr () from /usr/lib/libglib-2.0.so.0
#4  0x00007f2f44044526 in gst_caps_subtract (minuend=0x2549780, subtrahend=0x7f2f4a5cba80) at gstcaps.c:1370
#5  0x00007f2f440446cd in gst_caps_is_subset (subset=0x2549780, superset=0x7f2f4a5cba80) at gstcaps.c:1050
#6  0x00007f2f4404473d in gst_caps_is_equal (caps1=0x2549780, caps2=0x7f2f4a5cba80) at gstcaps.c:1087
#7  0x00007f2f44063503 in gst_pad_accept_caps (pad=0x7f2f48757e10, caps=0x2549780) at gstpad.c:2305
#8  0x00007f2f44063681 in gst_pad_configure_src (pad=0x66e1, caps=0x6712, dosetcaps=6) at gstpad.c:2488
#9  0x00007f2f4406416f in gst_pad_alloc_buffer_full (pad=0x7f2f48757e10, offset=18446744073709551615, size=4608, caps=0x2549780, 
    buf=0x45decd08, setcaps=0) at gstpad.c:2797
#10 0x00007f2f44063fd9 in gst_pad_alloc_buffer_full (pad=0x7f2f49c53e60, offset=18446744073709551615, size=4608, caps=0x2549780, 
    buf=0x45decd08, setcaps=0) at gstpad.c:2698
#11 0x00007f2f44063fd9 in gst_pad_alloc_buffer_full (pad=0x7f2f49c53450, offset=18446744073709551615, size=4608, caps=0x2549780, 
    buf=0x45decd08, setcaps=0) at gstpad.c:2698
#12 0x00007f2f3e4453bb in gst_selector_pad_bufferalloc (pad=0x7f2f38164ba0, offset=18446744073709551615, size=4608, caps=0x2549780, 
    buf=0x45decd08) at gststreamselector.c:364
#13 0x00007f2f44063fd9 in gst_pad_alloc_buffer_full (pad=0x7f2f380bf090, offset=18446744073709551615, size=4608, caps=0x2549780, 
    buf=0x45decd08, setcaps=0) at gstpad.c:2698
#14 0x00007f2f44063fd9 in gst_pad_alloc_buffer_full (pad=0x7f2f381165c0, offset=18446744073709551615, size=4608, caps=0x2549780, 
    buf=0x45decd08, setcaps=1) at gstpad.c:2698
#15 0x00007f2f3fd89098 in vorbis_handle_data_packet (vd=0x7f2f494d4af0, packet=0x45decda0) at vorbisdec.c:989
#16 0x00007f2f3fd8a3ea in vorbis_dec_decode_buffer (vd=0x7f2f494d4af0, buffer=<value optimized out>) at vorbisdec.c:1150
#17 0x00007f2f3fd8af1d in vorbis_dec_chain (pad=<value optimized out>, buffer=0x7f2f38128230) at vorbisdec.c:1361
#18 0x00007f2f44063875 in gst_pad_chain_unchecked (pad=0x7f2f381162e0, buffer=0x7f2f38128230) at gstpad.c:3877
#19 0x00007f2f4406490b in gst_pad_push (pad=0x7f2f38116e60, buffer=0x7f2f38128230) at gstpad.c:4045
#20 0x00007f2f3ea9f522 in gst_queue_loop (pad=<value optimized out>) at gstqueue.c:1047
#21 0x00007f2f44082c06 in gst_task_func (task=0x7f2f4a2203f0, tclass=<value optimized out>) at gsttask.c:192
#22 0x00007f2f519ae837 in ?? () from /usr/lib/libglib-2.0.so.0
#23 0x00007f2f519ad2a4 in ?? () from /usr/lib/libglib-2.0.so.0
#24 0x00007f2f515313ea in start_thread () from /lib/libpthread.so.0
#25 0x00007f2f51019c6d in clone () from /lib/libc.so.6
#26 0x0000000000000000 in ?? ()

Program received signal SIGSEGV, Segmentation fault.
0x00000000004a75c7 in ?? ()
(gdb) bt
#0  0x00000000004a75c7 in ?? ()
#1  0x00000000004aa3da in mono_jit_info_table_find ()
#2  0x00000000004f478c in ?? ()
#3  <signal handler called>
#4  0x00007f2f50f65fd5 in raise () from /lib/libc.so.6
#5  0x00007f2f50f67b43 in abort () from /lib/libc.so.6
#6  0x00007f2f519a9d83 in g_assertion_message () from /usr/lib/libglib-2.0.so.0
#7  0x00007f2f519aa222 in g_assertion_message_expr () from /usr/lib/libglib-2.0.so.0
#8  0x00007f2f44044526 in gst_caps_subtract (minuend=0x2549780, subtrahend=0x7f2f4a5cba80) at gstcaps.c:1370
#9  0x00007f2f440446cd in gst_caps_is_subset (subset=0x2549780, superset=0x7f2f4a5cba80) at gstcaps.c:1050
#10 0x00007f2f4404473d in gst_caps_is_equal (caps1=0x2549780, caps2=0x7f2f4a5cba80) at gstcaps.c:1087
#11 0x00007f2f44063503 in gst_pad_accept_caps (pad=0x7f2f48757e10, caps=0x2549780) at gstpad.c:2305
#12 0x00007f2f44063681 in gst_pad_configure_src (pad=0x66e1, caps=0x6712, dosetcaps=6) at gstpad.c:2488
#13 0x00007f2f4406416f in gst_pad_alloc_buffer_full (pad=0x7f2f48757e10, offset=18446744073709551615, size=4608, caps=0x2549780, 
    buf=0x45decd08, setcaps=0) at gstpad.c:2797
#14 0x00007f2f44063fd9 in gst_pad_alloc_buffer_full (pad=0x7f2f49c53e60, offset=18446744073709551615, size=4608, caps=0x2549780, 
    buf=0x45decd08, setcaps=0) at gstpad.c:2698
#15 0x00007f2f44063fd9 in gst_pad_alloc_buffer_full (pad=0x7f2f49c53450, offset=18446744073709551615, size=4608, caps=0x2549780, 
    buf=0x45decd08, setcaps=0) at gstpad.c:2698
#16 0x00007f2f3e4453bb in gst_selector_pad_bufferalloc (pad=0x7f2f38164ba0, offset=18446744073709551615, size=4608, caps=0x2549780, 
    buf=0x45decd08) at gststreamselector.c:364
#17 0x00007f2f44063fd9 in gst_pad_alloc_buffer_full (pad=0x7f2f380bf090, offset=18446744073709551615, size=4608, caps=0x2549780, 
    buf=0x45decd08, setcaps=0) at gstpad.c:2698
#18 0x00007f2f44063fd9 in gst_pad_alloc_buffer_full (pad=0x7f2f381165c0, offset=18446744073709551615, size=4608, caps=0x2549780, 
    buf=0x45decd08, setcaps=1) at gstpad.c:2698
#19 0x00007f2f3fd89098 in vorbis_handle_data_packet (vd=0x7f2f494d4af0, packet=0x45decda0) at vorbisdec.c:989
#20 0x00007f2f3fd8a3ea in vorbis_dec_decode_buffer (vd=0x7f2f494d4af0, buffer=<value optimized out>) at vorbisdec.c:1150
#21 0x00007f2f3fd8af1d in vorbis_dec_chain (pad=<value optimized out>, buffer=0x7f2f38128230) at vorbisdec.c:1361
#22 0x00007f2f44063875 in gst_pad_chain_unchecked (pad=0x7f2f381162e0, buffer=0x7f2f38128230) at gstpad.c:3877
#23 0x00007f2f4406490b in gst_pad_push (pad=0x7f2f38116e60, buffer=0x7f2f38128230) at gstpad.c:4045
#24 0x00007f2f3ea9f522 in gst_queue_loop (pad=<value optimized out>) at gstqueue.c:1047
#25 0x00007f2f44082c06 in gst_task_func (task=0x7f2f4a2203f0, tclass=<value optimized out>) at gsttask.c:192
#26 0x00007f2f519ae837 in ?? () from /usr/lib/libglib-2.0.so.0
#27 0x00007f2f519ad2a4 in ?? () from /usr/lib/libglib-2.0.so.0
#28 0x00007f2f515313ea in start_thread () from /lib/libpthread.so.0
#29 0x00007f2f51019c6d in clone () from /lib/libc.so.6
#30 0x0000000000000000 in ?? ()