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