[gst-devel] RTP jitter problems

[Wim Taymans]

On Tue, 2008-02-05 at 12:33 +0100, ANTONIO MARQUES MARQUES wrote:
> Hello all,
> 
> I am trying to send through a pipeline RTP H264 encoded video and
> showing it in other computer. When I receive it in not the same network
> I have some problems decoding the video. I have simulated the problem
> introducing jitter and it is a problem of jitter.
> 
> I have seen that there is an element called gstrtpjitterbuffer that
> tries to solve this problem, but when I use it in my pipeline I have
> negotiation caps error.
> 
> My pipelines are the following:
> 
> Sending pipeline:
> - gst-launch videotestsrc ! ffmpegcolorspace !
> video/x-raw-yuv,width=640,height=480 ! timeoverlay ! videorate ! x264enc
> byte-stream=true bitrate=250 key-int-max=6  subme=6 me=3 ! rtph264pay !
> queue ! udpsink host=127.0.0.1 port=1545
>    
> Receiving pipeline:
> 
> - gst-launch udpsrc port=1545 typefind=true caps=application/x-rtp !
> gstrtpjitterbuffer ! application/x-rtp !  rtph264depay ! queue !
> ffdec_h264 ! ffmpegcolorspace ! queue  ! ximagesink qos=FALSE
> 
> 
You need to negotiate the caps on the receiver side correctly (using SDP
or so). This document explains more:

http://webcvs.freedesktop.org/gstreamer/gst-plugins-good/gst/rtp/README?revision=1.13&view=markup

Wim
> 
> When I debug it with caps level 5, messages shown are the following:
> DEBUG             GST_CAPS
> gstpad.c:2400:gst_pad_set_caps:<rtpjitterbuffer0:sink> caps
> application/x-rtp could not be set
> 8 ERROR               ffmpeg
> gstffmpegdec.c:1776:gst_ffmpegdec_frame:<ffdec_h2640> no codec context
> 
> Any help?
> 
> Thanks
> 
> Antonio Marqués
> 
> 
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