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GStreamer » History » Version 4

P.G Bareges, 02/25/2013 10:18 PM

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h1. GStreamer
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h2. command line 
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h3.  theora over udp 
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*nécessite de lancer le receiver avant le sender... 
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*reprise possible du flux d'émission apres l'initialisation des 2 pipelines (sender/receive)
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*ne marche pas sous windows.
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<pre>
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Sender : 
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 gst-launch-0.10 -v v4l2src device=/dev/video0 ! \
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 'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! \
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 theoraenc ! udpsink host=10.20.0.62 port=1234
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Receiver :
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gst-launch-0.10 -v udpsrc port=1234 \
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 caps="video/x-theora, width=640, height=480, framerate=30/1, pixel-aspect-ratio=1/1" ! \
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 theoradec ! xvimagesink 
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stats on i7-2620M
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 ps -eo psr,pid,tid,class,rtprio,ni,pri,pcpu,stat,wchan:14,comm | grep [g]st
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  3 23360 23360 TS       -   0  19  8.6 Sl+  poll_schedule_ gst-launch-0.10
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  2 23363 23363 TS       -   0  19 47.8 Sl+  poll_schedule_ gst-launch-0.10
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</pre>
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h3. theora over rtp 
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*le serveur envoie ses caps toute les 5 secondes via config-interval=5
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*marche sous windows \o/ :)
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<pre>
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sender: 
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gst-launch-0.10 -v v4l2src device=/dev/video0 ! 'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! theoraenc ! rtptheorapay config-interval=5 ! udpsink host=10.20.0.62 port=1234
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receiver : 
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gst-launch-0.10 -v udpsrc port=1234 caps="application/x-rtp" ! rtptheoradepay ! theoradec ! xvimagesink
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</pre>
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h2. Processing
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<pre>
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/**
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 * Ripped from
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 * Camera capture pipelines. 
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 * By Andres Colubri
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 * 
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 * 
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 */
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import codeanticode.gsvideo.*;
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GSPipeline pipeline;
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void setup() {
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  size(640, 480);
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  frameRate(30);
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  pipeline = new GSPipeline(this, "udpsrc port=1234 caps=\"video/x-theora, width=640, height=480, framerate=30/1, pixel-aspect-ratio=1/1\" ! theoradec ");  
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  pipeline.play();
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}
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void draw() {
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  // When the GSPipeline.available() method returns true, 
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  // it means that a new frame is ready to be read.
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  if (pipeline.available()) {
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    pipeline.read();
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    image(pipeline, 0, 0);
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  }
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}
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</pre>
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h2. Liens
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*http://gsvideo.sourceforge.net/
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*http://wiki.oz9aec.net/index.php/Gstreamer_cheat_sheet 
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*http://lists.freedesktop.org/archives/gstreamer-devel/2011-July/032234.html