StacktraceTop: gst_buffer_is_metadata_writable (buf=0x0) at gstbuffer.c:684 gst_buffer_make_metadata_writable (buf=0x0) at gstbuffer.c:707 gst_base_parse_chain (pad=<optimized out>, buffer=<optimized out>) at gstbaseparse.c:2478 gst_pad_push (pad=0x7f6490006ad0, buffer=0x7f6490058670) at gstpad.c:4710 gst_single_queue_push_one (object=0x7f6490058670, sq=0x7f6490012ba0, mq=0x7f6490009010) at gstmultiqueue.c:1087
StacktraceTop: is_metadata_ writable (buf=0x0) at gstbuffer.c:684 make_metadata_ writable (buf=0x0) at gstbuffer.c:707 parse_chain (pad=<optimized out>, buffer=<optimized out>) at gstbaseparse.c:2478 6ad0, buffer= 0x7f6490058670) at gstpad.c:4710 queue_push_ one (object= 0x7f6490058670, sq=0x7f6490012ba0, mq=0x7f6490009010) at gstmultiqueue. c:1087
gst_buffer_
gst_buffer_
gst_base_
gst_pad_push (pad=0x7f649000
gst_single_