[gst-devel] Can not decode incoming RTP packet

[Wim Taymans]

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
> ------------------------------------------------------------------------------
> 
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel