A couple of RTP questions

[David Jaggard]

Thanks for your reply.

PT 33 is the RTP payload type for MPEG2 TS, which is what I'm expecting.
I've attached a log using GST_DEBUG=2,rtp*:6 as requested.

I'll put the gst launch crash into a separate message, sorry about that.

On 3 December 2015 at 10:52, Sebastian Dröge <sebastian at centricular.com>
wrote:

> On Mi, 2015-12-02 at 13:34 +0000, David Jaggard wrote:
> > GStreamer 1.6.1 on Windows
> >
> > Here is a test pipeline:
> > gst-launch-1.0.exe rtpbin name=rtpbinout udpsrc caps=application/x-
> > rtp,media=video,clock-rate=(int)90000 address=239.192.65.121
> > port=5000 ! rtpbin ! queue2 ! rtpmp2tdepay ! tsdemux name=demux !
> > queue2 ! video/x-h264 ! decodebin ! deinterlace fields=1 method=3 !
> > x264enc ! video/x-h264,profile=baseline ! queue2 ! rtph264pay !
> > rtpbinout.send_rtp_sink_0 rtpbinout.send_rtp_src_0 ! multiudpsink
> > clients=227.0.0.82:50090 ttl-mc=100 demux. ! queue2 ! audio/mpeg !
> > decodebin ! audioconvert ! audio/x-raw,channels=1 ! audioresample !
> > audio/x-raw,rate=48000 ! voaacenc bitrate=128000 !
> > audio/mpeg,mpegversion=4 ! queue2 ! rtpmp4gpay pt=97 !
> > rtpbinout.send_rtp_sink_1 rtpbinout.send_rtp_src_1 ! multiudpsink
> > clients=227.0.0.82:50092 ttl-mc=100
> >
> > The source mpeg2 ts containing h264 video and aac audio - the
> > transcoding is necessary for a particular client application.
> >
> > Question 1:
> > Why does it generate a constant stream of these warnings?
> > rtpsource rtpsource.c:950:calculate_jitter: cannot get clock-rate for
> > pt 33
>
> That means you get packets from pt=33 somehow but those are not seen as
> the one you are setting caps for on udpsrc. Just guessing here though,
> needs at least a debug log with "2,rtp*:6" to be sure.
>
> > Question 2:
> > Why does the pipeline use a GstSystemClock? I would have though it
> > would clock off the live source. Is this related to question 1?
>
> There is nothing else in the pipeline that would provide a clock, so we
> use the system clock instead.
>
> > gst-launch crashes after a few minutes
>
> How does it crash? That would be a separate issue. Do you have a
> backtrace?
>
> --
> Sebastian Dröge, Centricular Ltd · http://www.centricular.com
>
>
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>
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