[gst-devel] Can not decode incoming RTP packet

[孝恆 呂]

hi, all,

I wrote a simple RTSP client to contact an existing RTSP IP CAM,

and take a conversation to the CAM:

>> OPTIONS * RTSP/1.0
>> CSeq: 30

  << RTSP/1.0 200 OK
  << CSeq: 30
  << Public: DESCRIBE,SETUP,PLAY,OPTIONS,PAUSE,TEARDOWN

>> DESCRIBE rtsp://myipcam/h264.sdp RTSP/1.0
>> CSeq: 31

  << RTSP/1.0 200 OK
  << CSeq: 31
  << Cache-Control: no-cache
  << Content-Length: 171
  << Content-Type: application/sdp
  << x-Accept-Retransmit: our-retransmit
  << x-Accept-Dynamic-Rate: 1

  << v=0
  << m=video 0 RTP/AVP 96
  << a=rtpmap:96 H264/90000
  << a=control:trackID=1
  << a=fmtp:96
packetization-mode=1;profile-level-id=428032;sprop-parameter-sets=Z0KAMukGCcg=,aM48gA==

>> SETUP rtsp://myipcam/h264.sdp/trackID=1 RTSP/1.0
>> CSeq: 32
>> Transport: RTP/AVP;unicast;client_port=54962-54963

  << RTSP/1.0 200 OK
  << CSeq: 32
  << Cache-Control: no-cache
  << Session: 135514808124572
  << Transport:
RTP/AVP;unicast;client_port=-10574--10573;server_port=6970-6971

>> PLAY rtsp://myipcam/h264.sdp RTSP/1.0
>> CSeq: 33
>> Session: 135514808124572
>> Range: npt=0.000-

  << RTSP/1.0 200 OK
  << CSeq: 33
  << Session: 135514808124572
  << Range: npt=now-

it works and now the RTSP IP CAM continuously streams packets to my local
port number (#54962)

but for some purpose I didn't create an UDP listener on port #54962,

instead, I want to use gstreamer to playback the incoming video stream,

the below is my command:

  gst-launch -v udpsrc port=54962 caps="application/x-rtp, media=video,
clock-rate=90000, encoding-name=H264" ! rtph264depay ! decodebin2 !
ffmpegcolorspace ! autovideosink

it works to receive the incoming packets,

but error occurs at the decoding stage,

...
...
0:00:53.466058000  4272   019F78E8 ERROR                 ffmpeg .:0::
decode_slice_header error
0:00:53.468058000  4272   019F78E8 ERROR                 ffmpeg .:0:: no
frame!
0:00:53.677070000  4272   019F78E8 ERROR                 ffmpeg .:0::
non-existing PPS referenced
0:00:53.680071000  4272   019F78E8 ERROR                 ffmpeg .:0::
non-existing PPS 0 referenced
0:00:53.682071000  4272   019F78E8 ERROR                 ffmpeg .:0::
decode_slice_header error
0:00:53.683071000  4272   019F78E8 ERROR                 ffmpeg .:0:: no
frame!
0:00:53.685071000  4272   019F78E8 ERROR                 ffmpeg .:0::
non-existing PPS referenced
0:00:53.687071000  4272   019F78E8 ERROR                 ffmpeg .:0::
non-existing PPS 0 referenced
0:00:53.689071000  4272   019F78E8 ERROR                 ffmpeg .:0::
decode_slice_header error
0:00:53.691071000  4272   019F78E8 ERROR                 ffmpeg .:0:: no
frame!
...
...

can anyone helps??



-- 
Hsiao-heng Lu
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