[gst-devel] Can not decode incoming RTP packet
Wim Taymans
wim.taymans at gmail.com
Tue May 18 09:42:11 CEST 2010
On Tue, 2010-05-18 at 15:22 +0800, 孝恆 呂 wrote:
> 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
>
You forgot to pass the fmtp parameters to the depayloader on the caps.
In particular, the depayloader does not have sprop-parameter-sets which
contains SPS and PPS for the decoder.
Wim
> 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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