h1. GStreamer



h2. from command line
h3. : simple theora encoding stream over udp



<pre>

Sender :

gst-launch-0.10 -v v4l2src device=/dev/video0 ! \

'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! \

theoraenc ! udpsink host=10.20.0.62 port=1234



Receiver :

gst-launch-0.10 -v udpsrc port=1234 \

caps="video/x-theora, width=640, height=480, framerate=30/1, pixel-aspect-ratio=1/1" ! \

theoradec ! xvimagesink



stats on i7-2620M



ps -eo psr,pid,tid,class,rtprio,ni,pri,pcpu,stat,wchan:14,comm | grep [g]st

3 23360 23360 TS - 0 19 8.6 Sl+ poll_schedule_ gst-launch-0.10

2 23363 23363 TS - 0 19 47.8 Sl+ poll_schedule_ gst-launch-0.10



</pre>
nécessite de lancer le receiver avant le sender... reprise possible du flux d'émission apres l'initialisation des 2 pipelines (sender/receive)
ne marche pas sous windows.

h3. rtp

le serveur envoie ses caps toute les 5 secondes via config-interval=5
marche sous windows \o/ :)

<pre>

sender:

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

receiver :

gst-launch-0.10 -v udpsrc port=1234 caps="application/x-rtp" ! rtptheoradepay ! theoradec ! xvimagesink

</pre>



h2. Processing



<pre>

/**

* Ripped from

* Camera capture pipelines.

* By Andres Colubri

*

*

*/



import codeanticode.gsvideo.*;



GSPipeline pipeline;



void setup() {

size(640, 480);

frameRate(30);

pipeline = new GSPipeline(this, "udpsrc port=1234 caps=\"video/x-theora, width=640, height=480, framerate=30/1, pixel-aspect-ratio=1/1\" ! theoradec ");

pipeline.play();

}



void draw() {

// When the GSPipeline.available() method returns true,

// it means that a new frame is ready to be read.

if (pipeline.available()) {

pipeline.read();

image(pipeline, 0, 0);

}

}



</pre>



h2. Liens

*http://gsvideo.sourceforge.net/
*http://wiki.oz9aec.net/index.php/Gstreamer_cheat_sheet
*http://lists.freedesktop.org/archives/gstreamer-devel/2011-July/032234.html


http://gsvideo.sourceforge.net/