Break down pipelines using udpsrc/udpsink

[pfarmer]

On 03/04/2013 10:25 PM, Gary Thomas [via GStreamer-devel] wrote:
> On 2013-03-04 13:15, pfarmer wrote:
>
> > Gary Thomas wrote
> >> I'm trying to split up a pipeline using udpsrc/udpsink elements.
> >> All of the "network" traffic will be local.  This is in anticipation
> >> of having some variable number of sinks for a single data source
> >> (I have a camera that I want to share amongst a number of 
> applications)
> >>
> >> I have this working pipeline:
> >>     gst-launch -e -v v4l2src device=/dev/video0 queue-size=16 \
> >>       !
> >> 
> video/x-raw-yuv,format='(fourcc)UYVY',width=1280,height=720,framerate=30/1
> >> \
> >>       ! tee name=v-t \
> >>         v-t. ! queue ! videoscale ! 
> "video/x-raw-yuv,width=240,height=120"
> >> ! ffmpegcolorspace ! ximagesink force-aspect-ratio=true
> >> This pipeline just takes the output of the camera and displays it in
> >> a window on my desktop.
> >>
> >> I've tried splitting it up like this:
> >>     # Start the source pipeline
> >>     gst-launch -e -v v4l2src device=/dev/video0 queue-size=16 \
> >>        !
> >> 
> video/x-raw-yuv,format='(fourcc)UYVY',width=1280,height=720,framerate=30/1
> >> \
> >>        ! tee name=v-src \
> >>          v-src. ! queue ! rtpvrawpay pt=96 ! udpsink port=61000
> >>
> >>     # Display the image
> >>     gst-launch -e -v udpsrc port=61000  \
> >>       !
> >> 
> "application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)RAW,sampling=(string)YCbCr-4:2:2,depth=(string)8,width=(string)1280,height=(string)720,colorimetry=(string)SMPTE240M,payload=(int)96"
> >> \
> >>       ! rtpvrawdepay \
> >>       !
> >> 
> video/x-raw-yuv,format='(fourcc)UYVY',width=1280,height=720,framerate=30/1
> >> \
> >>       ! tee name=v-t \
> >>         v-t. ! queue ! videoscale ! 
> "video/x-raw-yuv,width=240,height=120"
> >> ! ffmpegcolorspace ! ximagesink force-aspect-ratio=true
> >>
> >> I can see that the packets are being sent between the two pipelines,
> >> but it looks like they are being quietly dropped (no messages).  It's
> >> not totally clear that they are arriving to the second pipeline at 
> all.
> >> I've also tried this where the source pipeline is on one machine and
> >> the receiving pipeline is on another, still no luck.
> >>
> >> I know that the CAPS match because I copied them from the output of
> >> a previous run.
> >>
> >> Any hints what I might be doing wrong & how to make this work?
> >
> > Try to make the imagesink not syncing to the clock: sync=false
> > In my case the ximagesink also does not work, I have to use the 
> xvimagesink.
> > For example:
> > Sender:
> >   gst-launch -v v4l2src ! tee ! queue ! ffmpegcolorspace !
> > video/x-raw-yuv,format='(fourcc)UYVY',width=1280,height=720, 
> framerate=30/1
> > ! rtpvrawpay ! udpsink port=61000  tee0. ! queue ! xvimagesink 
> sync=false
> > Receiver:
> >   gst-launch udpsrc port=61000 caps="application/x-rtp,
> > encoding-name=(string)RAW, sampling=(string)YCbCr-4:2:2, 
> width=(string)1280,
> > height=(string)720, colorimetry=(string)BT709-2, depth=(string)8" !
> > rtpvrawdepay ! xvimagesink
>
> That didn't make any difference, sorry.
>
> I also tried adding the extra branch to do a local display and ran this
> between machines - the source machine displays fine, the destination 
> shows nothing.
>
> Do the above quoted pipelines imply that they actually run for you? 
>  Are you
> using gstreamer-0.10 or 1.0?  (I'm stuck on 0.10 for the time being)
>
> >
> >
> > Gary Thomas wrote
> >> Is this a reasonable approach to sharing this data?  Eventually
> >> I need to grab & display it on the screen while at the same time
> >> sending it out over a [physical] network.
> >
> > On the same machine shared memory might be better suited. I.e. with
> > shmsink/shmsrc (at least on a Unix machine).
> >
>
> Thanks for the pointer, I'll check it out.
>
> -- 
> ------------------------------------------------------------
> Gary Thomas                 |  Consulting for the
> MLB Associates              |    Embedded world
> ------------------------------------------------------------
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>
I used gstreamer 0.10.
"I also tried adding the extra branch" what do you mean by that? It 
should work more easy on the same machine. Also check your firewall.
Does a minimalistic (without tee's and without a real src) example 
work?, like:
Sender:
  gst-launch videotestsrc horizontal-speed=5 ! video/x-raw-yuv ! 
rtpvrawpay ! udpsink port=5001
Receiver:
  gst-launch udpsrc port=5001 caps="application/x-rtp, 
sampling=(string)YCbCr-4:2:2, width=(string)320, height=(string)240" ! 
rtpvrawdepay ! xvimagesink





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