udpsrc : I can't receive h264 packet and play it

[Du Dengke]

Hi experts:
OS: Ubuntu 16.04.6 LTS
Gstreamer Version: I update it to 1.16.0

Sender and Receiver both on one machine.

Sender:
    GST_DEBUG=4 gst-launch-1.0 filesrc location=easy_c.mp4 ! qtdemux !
h264parse ! rtph264pay ! udpsink
I using wireshark to watch, all thing go well, something like:
    ......
    31072 121.161706931 127.0.0.1 127.0.0.1 UDP 1442 51378 → 5004 Len=1400
    ......

Receiver:
    GST_DEBUG=4 gst-launch-1.0 udpsrc caps="application/x-rtp" !
rtph264depay ! h264parse ! avdec_h264 ! xvimagesink

seems go well, but nothing appear, I take some log here:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Setting pipeline to PLAYING ...
0:00:00.020110200  4381      0x202cc00 INFO               GST_EVENT
gstevent.c:1450:gst_event_new_latency: creating latency event
0:00:00.000000000
0:00:00.020125274  4381      0x202cc00 INFO                     bin
gstbin.c:2780:gst_bin_do_latency_func:<pipeline0> configured latency of
0:00:00.000000000
0:00:00.020136579  4381      0x202cc00 INFO              GST_STATES
gstbin.c:2503:gst_bin_element_set_state:<xvimagesink0> current READY
pending PAUSED, desired next PLAYING
0:00:00.020142248  4381      0x202cc00 INFO              GST_STATES
gstbin.c:2957:gst_bin_change_state_func:<pipeline0> child 'xvimagesink0' is
changing state asynchronously to PLAYING
0:00:00.020148377  4381      0x202cc00 INFO              GST_STATES
gstbin.c:2503:gst_bin_element_set_state:<avdec_h264-0> current PAUSED
pending VOID_PENDING, desired next PLAYING
0:00:00.020154187  4381      0x202cc00 INFO              GST_STATES
gstelement.c:2676:gst_element_continue_state:<avdec_h264-0> completed state
change to PLAYING
0:00:00.020159424  4381      0x202cc00 INFO              GST_STATES
gstelement.c:2579:_priv_gst_element_state_changed:<avdec_h264-0> notifying
about state-changed PAUSED to PLAYING (VOID_PENDING pending)
0:00:00.020166928  4381      0x202cc00 INFO              GST_STATES
gstbin.c:2951:gst_bin_change_state_func:<pipeline0> child 'avdec_h264-0'
changed state to 4(PLAYING) successfully
0:00:00.020173149  4381      0x202cc00 INFO              GST_STATES
gstbin.c:2503:gst_bin_element_set_state:<h264parse0> current PAUSED pending
VOID_PENDING, desired next PLAYING
0:00:00.020178564  4381      0x202cc00 INFO              GST_STATES
gstelement.c:2676:gst_element_continue_state:<h264parse0> completed state
change to PLAYING
0:00:00.020183568  4381      0x202cc00 INFO              GST_STATES
gstelement.c:2579:_priv_gst_element_state_changed:<h264parse0> notifying
about state-changed PAUSED to PLAYING (VOID_PENDING pending)
0:00:00.020190138  4381      0x202cc00 INFO              GST_STATES
gstbin.c:2951:gst_bin_change_state_func:<pipeline0> child 'h264parse0'
changed state to 4(PLAYING) successfully
0:00:00.020196292  4381      0x202cc00 INFO              GST_STATES
gstbin.c:2503:gst_bin_element_set_state:<rtph264depay0> current PAUSED
pending VOID_PENDING, desired next PLAYING
0:00:00.020201631  4381      0x202cc00 INFO              GST_STATES
gstelement.c:2676:gst_element_continue_state:<rtph264depay0> completed
state change to PLAYING
0:00:00.020206440  4381      0x202cc00 INFO              GST_STATES
gstelement.c:2579:_priv_gst_element_state_changed:<rtph264depay0> notifying
about state-changed PAUSED to PLAYING (VOID_PENDING pending)
0:00:00.020212854  4381      0x202cc00 INFO              GST_STATES
gstbin.c:2951:gst_bin_change_state_func:<pipeline0> child 'rtph264depay0'
changed state to 4(PLAYING) successfully
0:00:00.020222030  4381      0x202cc00 INFO              GST_STATES
gstelement.c:2676:gst_element_continue_state:<udpsrc0> completed state
change to PLAYING
0:00:00.020228362  4381      0x202cc00 INFO              GST_STATES
gstelement.c:2579:_priv_gst_element_state_changed:<udpsrc0> notifying about
state-changed PAUSED to PLAYING (VOID_PENDING pending)
0:00:00.020234673  4381      0x202cc00 INFO              GST_STATES
gstbin.c:2951:gst_bin_change_state_func:<pipeline0> child 'udpsrc0' changed
state to 4(PLAYING) successfully
New clock: GstSystemClock
0:01:17.678501741  4381      0x21460a0 INFO               GST_EVENT
gstevent.c:901:gst_event_new_segment: creating segment event time segment
start=0:00:00.000000000, offset=0:00:00.000000000, stop=99:99:99.999999999,
rate=1.000000, applied_rate=1.000000, flags=0x00, time=0:00:00.000000000,
base=0:00:00.000000000, position 0:00:00.000000000, duration
99:99:99.999999999
0:01:17.678521905  4381      0x21460a0 INFO                 basesrc
gstbasesrc.c:2962:gst_base_src_loop:<udpsrc0> marking pending DISCONT
0:01:17.678543028  4381      0x21460a0 INFO               GST_EVENT
gstevent.c:901:gst_event_new_segment: creating segment event time segment
start=0:00:00.000000000, offset=0:00:00.000000000, stop=99:99:99.999999999,
rate=1.000000, applied_rate=1.000000, flags=0x00, time=0:00:00.000000000,
base=0:00:00.000000000, position 0:01:17.658403007, duration
99:99:99.999999999
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The receiver stop here.

My question:
    How to let me know the receiver receive the packets, and why can't i
play it?

//dengke
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