[gst-devel] Problem with rtp live streaming and 'computer too

[Mallard]

It is critical that you include the caps line, including the  
s-props-parameter string, that the 'sender' generates when you start  
the receiver.

A correct set of caps on the reciever will look something like:
"application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)H264,  
\
sprop-parameter-sets=\"Z2QAHqwkqAtD2wFQgAAB9IAAdTAHixdQ,aO8yyLA=\", \
ssrc=(guint)204906444,payload=(int)96,clock-base=(guint)3249570813,seqnum-base=(guint)5734"

Note that it is critical that you properly escape spaces, commas, +  
signs, etc - or the receiver will not start correctly.

Good luck!



> Message: 3
> Date: Fri, 09 Apr 2010 18:03:38 -0600
> From: Mark Sauer <mark at skitter.tv>
> Subject: [gst-devel] Problem with rtp live streaming and 'computer too
> 	slow'	message
> To: gstreamer-devel at lists.sourceforge.net
> Message-ID: <4BBFC05A.8070606 at skitter.tv>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I've been trying to set up a gstreamer graph (using gst-launch, as well
> as a C application) to receive a multicasted rtp video sequence encoded
> with a mpeg 2 transport stream, using h.264 video and aac audio, and
> rendering it to a window.
>
> I have a graph that works pretty well, and it is described by this call
> to gst-launch:
>
> gst-launch-0.10.exe udpsrc uri=udp://224.0.22.1:40000
> caps="application/x-rtp, media=(string)video, clock-rate=(int)90000,
> encoding-name=(string)MP2T-ES, payload=(int)33" ! gstrtpbin latency=4000
> ! rtpmp2tdepay ! mpegtsdemux name=a a. ! queue ! ffdec_h264 !
> ffmpegcolorspace ! b. b. ! autovideosink a. ! queue ! faad !
> audioconvert ! b. b. ! autoaudiosink multiqueue max-size-bytes=0
> max-size-buffers=40000 max-size-time=0 name=b
>
> I have a live encoder streaming to the address 224.0.22.1 on port
> 40000.  The window pops up with this graph, and the video/audio play
> fine for a few minutes, sometimes even up to 20-30 minutes.  But more
> often after about 1-2 minutes I start seeing lots of messages like this
> in the console:
>
> ..\..\libs\gst\base\gstbasesink.c(2572): gst_base_sink_is_too_late ():
> /GstPipeline:pipeline0/GstDshowVideoSink:dshowvideosink0:
> There may be a timestamping problem, or this computer is too slow.
>
> This is repeated over and over, and the video becomes very choppy, as
> many frames are dropped.  My computer is not too slow, gstreamer uses
> only about 10% of one cpu to decode this stream (it is 720x480 at 1 mbps).
>
> I have tried this under both Windows (using the dshowvideosink), and
> under linux (using the xvimagesink and ximagesink).  The problem seems
> to always occur, although it is worse on Windows.
>
> I am wondering if I am doing something wrong here, and/or if it is a
> gstreamer bug?
>
> Thanks,
> Mark Sauer