when it works :
0:00:20.377655000  7814 0x13050 INFO            GST_STATES gstbin.c:2084:gst_bin_change_state_func:<pipeline> changing state of children from PAUSED to PLAYING
0:00:20.385376000  7814 0x13050 INFO            GST_STATES gstbin.c:2153:gst_bin_change_state_func:<pipeline> child 'recv0' is changing state asynchronously to PLAYING
0:00:20.391083000  7814 0x13050 DEBUG           GST_STATES gstelement.c:2238:gst_element_set_state_func:<rtpsinkelement> set_state to PLAYING
0:00:20.392639000  7814 0x13050 DEBUG           GST_STATES gstelement.c:2271:gst_element_set_state_func:<rtpsinkelement> current PAUSED, old_pending VOID_PENDING, next VOID_PENDING, old return SUCCESS
0:00:20.394287000  7814 0x13050 DEBUG           GST_STATES gstelement.c:2305:gst_element_set_state_func:<rtpsinkelement> final: setting state from PAUSED to PLAYING
0:00:20.396271000  7814 0x13050 LOG             GST_STATES gstelement.c:2580:gst_element_change_state_func:<rtpsinkelement> default handler tries setting state from PAUSED to PLAYING (001c)
0:00:20.402374000  7814 0x13050 DEBUG           GST_STATES gstelement.c:2396:gst_element_change_state:<rtpsinkelement> element changed state SUCCESS
0:00:20.404236000  7814 0x13050 INFO            GST_STATES gstelement.c:2093:gst_element_continue_state:<rtpsinkelement> completed state change to PLAYING
0:00:20.407013000  7814 0x13050 LOG             GST_STATES gstelement.c:2412:gst_element_change_state:<rtpsinkelement> exit state change 1
0:00:20.408630000  7814 0x13050 DEBUG           GST_STATES gstelement.c:2317:gst_element_set_state_func:<rtpsinkelement> returned SUCCESS
0:00:20.410125000  7814 0x13050 INFO            GST_STATES gstbin.c:2147:gst_bin_change_state_func:<pipeline> child 'rtpsinkelement' changed state to 4(PLAYING) successfully
0:00:20.413177000  7814 0x13050 DEBUG           GST_STATES gstelement.c:2238:gst_element_set_state_func:<rtpdemux0> set_state to PLAYING


when it bugs :
0:00:38.227356000  7814 0x13050 INFO            GST_STATES gstbin.c:2084:gst_bin_change_state_func:<pipeline> changing state of children from PAUSED to PLAYING
0:00:38.234527000  7814 0x13050 INFO            GST_STATES gstbin.c:2153:gst_bin_change_state_func:<pipeline> child 'recv99' is changing state asynchronously to PLAYING
0:00:38.237213000  7814 0x13050 INFO            GST_STATES gstbin.c:2153:gst_bin_change_state_func:<pipeline> child 'rtpsinkelement' is changing state asynchronously to PLAYING
0:00:38.240326000  7814 0x13050 DEBUG           GST_STATES gstelement.c:2238:gst_element_set_state_func:<rtpdemux0> set_state to PLAYING