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<div class="moz-cite-prefix">On 03/04/2013 10:25 PM, Gary Thomas
[via GStreamer-devel] wrote:<br>
</div>
<blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' cite="mid:513510D8.8030801@mlbassoc.com" type="cite"> On
2013-03-04 13:15, pfarmer wrote:
<div class="shrinkable-quote"><br>
> Gary Thomas wrote
<br>
>> I'm trying to split up a pipeline using udpsrc/udpsink
elements.
<br>
>> All of the "network" traffic will be local. This is in
anticipation
<br>
>> of having some variable number of sinks for a single
data source
<br>
>> (I have a camera that I want to share amongst a number
of applications)
<br>
>>
<br>
>> I have this working pipeline:
<br>
>> gst-launch -e -v v4l2src device=/dev/video0
queue-size=16 \
<br>
>> !
<br>
>>
video/x-raw-yuv,format='(fourcc)UYVY',width=1280,height=720,framerate=30/1<br>
>> \
<br>
>> ! tee name=v-t \
<br>
>> v-t. ! queue ! videoscale !
"video/x-raw-yuv,width=240,height=120"
<br>
>> ! ffmpegcolorspace ! ximagesink force-aspect-ratio=true
<br>
>> This pipeline just takes the output of the camera and
displays it in
<br>
>> a window on my desktop.
<br>
>>
<br>
>> I've tried splitting it up like this:
<br>
>> # Start the source pipeline
<br>
>> gst-launch -e -v v4l2src device=/dev/video0
queue-size=16 \
<br>
>> !
<br>
>>
video/x-raw-yuv,format='(fourcc)UYVY',width=1280,height=720,framerate=30/1<br>
>> \
<br>
>> ! tee name=v-src \
<br>
>> v-src. ! queue ! rtpvrawpay pt=96 ! udpsink
port=61000
<br>
>>
<br>
>> # Display the image
<br>
>> gst-launch -e -v udpsrc port=61000 \
<br>
>> !
<br>
>>
"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"<br>
>> \
<br>
>> ! rtpvrawdepay \
<br>
>> !
<br>
>>
video/x-raw-yuv,format='(fourcc)UYVY',width=1280,height=720,framerate=30/1<br>
>> \
<br>
>> ! tee name=v-t \
<br>
>> v-t. ! queue ! videoscale !
"video/x-raw-yuv,width=240,height=120"
<br>
>> ! ffmpegcolorspace ! ximagesink force-aspect-ratio=true
<br>
>>
<br>
>> I can see that the packets are being sent between the
two pipelines,
<br>
>> but it looks like they are being quietly dropped (no
messages). It's
<br>
>> not totally clear that they are arriving to the second
pipeline at all.
<br>
>> I've also tried this where the source pipeline is on
one machine and
<br>
>> the receiving pipeline is on another, still no luck.
<br>
>>
<br>
>> I know that the CAPS match because I copied them from
the output of
<br>
>> a previous run.
<br>
>>
<br>
>> Any hints what I might be doing wrong & how to make
this work?
<br>
>
<br>
> Try to make the imagesink not syncing to the clock:
sync=false
<br>
> In my case the ximagesink also does not work, I have to use
the xvimagesink.
<br>
> For example:
<br>
> Sender:
<br>
> gst-launch -v v4l2src ! tee ! queue ! ffmpegcolorspace !
<br>
>
video/x-raw-yuv,format='(fourcc)UYVY',width=1280,height=720,
framerate=30/1
<br>
> ! rtpvrawpay ! udpsink port=61000 tee0. ! queue !
xvimagesink sync=false
<br>
> Receiver:
<br>
> gst-launch udpsrc port=61000 caps="application/x-rtp,
<br>
> encoding-name=(string)RAW, sampling=(string)YCbCr-4:2:2,
width=(string)1280,
<br>
> height=(string)720, colorimetry=(string)BT709-2,
depth=(string)8" !
<br>
> rtpvrawdepay ! xvimagesink
</div>
<br>
That didn't make any difference, sorry.
<br>
<br>
I also tried adding the extra branch to do a local display and ran
this
<br>
between machines - the source machine displays fine, the
destination shows nothing.
<br>
<br>
Do the above quoted pipelines imply that they actually run for
you? Are you
<br>
using gstreamer-0.10 or 1.0? (I'm stuck on 0.10 for the time
being)
<br>
<div class="shrinkable-quote"><br>
>
<br>
>
<br>
> Gary Thomas wrote
<br>
>> Is this a reasonable approach to sharing this data?
Eventually
<br>
>> I need to grab & display it on the screen while at
the same time
<br>
>> sending it out over a [physical] network.
<br>
>
<br>
> On the same machine shared memory might be better suited.
I.e. with
<br>
> shmsink/shmsrc (at least on a Unix machine).
<br>
>
</div>
<br>
Thanks for the pointer, I'll check it out.
<br>
<br>
-- <br>
------------------------------------------------------------
<br>
Gary Thomas | Consulting for the
<br>
MLB Associates | Embedded world
<br>
------------------------------------------------------------
<br>
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</blockquote>
I used gstreamer 0.10. <br>
"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.<br>
Does a minimalistic (without tee's and without a real src) example
work?, like:<br>
Sender:<br>
gst-launch videotestsrc horizontal-speed=5 ! video/x-raw-yuv !
rtpvrawpay ! udpsink port=5001<br>
Receiver:<br>
gst-launch udpsrc port=5001 caps="application/x-rtp,
sampling=(string)YCbCr-4:2:2, width=(string)320, height=(string)240"
! rtpvrawdepay ! xvimagesink<br>
<br>
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