virtual machine in VMPlayer not connecting to internet

 use bridged connection then click on network adapter, uncheck the network adapters which are not needed. Select only needed network adapters..

Hadoop 2 setup on local environment

Short notes

- Follow http://raseshmori.wordpress.com/2012/10/14/install-hadoop-nextgen-yarn-multi-node-cluster/
- enable ssh to localhost
- install open ssh client etc
- change mapredude.shuffle to mapreduce_shuffle in the xml file in abive blog.
   - http://www.thecloudavenue.com/2012/01/getting-started-with-nextgen-mapreduce.html
- change all master: hosts in all *.xml files etc to locahost
 e.g

    yarn.resourcemanager.resource-tracker.address
    localhost:8031
 

 
    yarn.resourcemanager.scheduler.address
    localhost:8030
 
 
    yarn.resourcemanager.address
    localhost:8040
 

gstreamer java enable debuggig

Many people find it difficult to debug gstreamer pipeline written in gstreamer java. Only thing you need to do it to set GST_DEBUG environment variable e.g. on linux boxes it can be set by export GST_DEBUG=3 (r whatever debug level you want).

After this is set the just run the java application pipeline. You will see all debug messages printed. HTH.

Audio over RTP(real time protocol) using Gstreamer java

Just a test code. If it does something bad..don blame me :) .

Port used is 5000

package com.xxxxxxxxxxxxxx;

import java.util.logging.Logger;

import org.gstreamer.Bus;
import org.gstreamer.Element;
import org.gstreamer.Element.PAD_ADDED;
import org.gstreamer.ElementFactory;
import org.gstreamer.Gst;
import org.gstreamer.GstObject;
import org.gstreamer.Pad;
import org.gstreamer.Pipeline;
import org.gstreamer.State;
import org.gstreamer.elements.good.RTPBin;
import org.gstreamer.lowlevel.MainLoop;

/**
 * Sends audio over rtp
 *
 * use this command to test on remote host
 *      gst-launch-0.10 -v udpsrc port=5000 ! "application/x-rtp,media=(string)audio, clock-rate=(int)44100, width=16, height=16, encoding-name=(string)L16, encoding-params=(string)1, channels=(int)1, channel-positions=(int)1, payload=(int)96" ! rtpL16depay ! audioconvert ! autoaudiosink
 *
 * @author skhurana
 *
 */
public class HWRtp {

    private static Logger logger = Logger.getLogger("HW") ;
    private static final String REMOTE_HOST = "hostIPAddressWhereStreamingWillHappen" ;
   
    public static void main(String[] args) {
        final MainLoop loop = new MainLoop();
        args = Gst.init("RtpUtil", args);
        logger.info("Gstreamer version is " + Gst.getVersionString());
        Element source, demuxer,  conv, sink ;
        final Element decoder ;
        Bus bus;
        Pipeline pipeline  ;
       
        pipeline = new Pipeline("audio-player") ;
        source = ElementFactory.make("filesrc", "file-source") ;
        demuxer = ElementFactory.make("oggdemux", "ogg-demuxer") ;
        decoder = ElementFactory.make("vorbisdec", "vorbis-decoder") ;
        // audioconvert - Convert audio to different formats.
        conv = ElementFactory.make("audioconvert", "converter") ;
       
       
        // setup the pipeline
        source.set("location", "/home/skhurana/rtx/mediacontent/test.ogg") ;
        // add message handler
        //TODO - Do something with loop here
        bus = pipeline.getBus() ;
        bus.connect(new Bus.EOS() {
            public void endOfStream(GstObject source) {
                logger.info(" End of stream reached, source is...." + source.getName()) ;
                loop.quit() ;
                loop.dispose();
            }
        }) ;
       
        bus.connect(new Bus.ERROR() {
            public void errorMessage(GstObject source, int code, String message) {
                // TODO Auto-generated method stub
                logger.info(" Error occurred, code is " + code + ". Message is " + message) ;
            }
        }) ;
       
        // do rtp stuff now
        // ************* rtp stuff starts
        // create rtpbin
        RTPBin rtpbin = new RTPBin("audio-rtp") ;
        // create udpsink - send data over network via udp
        Element udpSink_rtpout = ElementFactory.make("udpsink", "udpsink0") ;
        udpSink_rtpout.set("host", REMOTE_HOST) ;
        udpSink_rtpout.set("port", 5000) ;
       
        // rtpL16pay - payload encode raw audio over rtp packets
        Element rtpL16pay = ElementFactory.make("rtpL16pay", "rtpPay") ;
        // ************** rtp stuff ends
       
        // add all elements into a pipeline
        pipeline.addMany(source, demuxer, decoder, conv, rtpL16pay, rtpbin, udpSink_rtpout) ;
       
       
        // link the elements together
        Element.linkMany(source, demuxer) ;
        Element.linkMany(decoder, conv, rtpL16pay) ;
        // link to rtp
        logger.info("Linking pads ....") ;
        Element.linkPads(rtpL16pay, "src", rtpbin, "send_rtp_sink_0") ;
        Element.linkPads(rtpbin, "send_rtp_src_0", udpSink_rtpout, "sink") ;
       
       
        demuxer.connect(new PAD_ADDED() {
            public void padAdded(Element element, Pad pad) {
                logger.info("Dynamic pad added, linking demuxer/decoder") ;
                Pad sinkPad = decoder.getStaticPad("sink") ;
                Element.linkPads(element, pad.getName(), decoder, sinkPad.getName()) ;
            }
        }) ;
       
       
        // note that demuxer will be linked to decoder dynamically. The reason is that
        // Ogg may contain various streams e.g. audio and video.
        // The source pad(s) will be created at run time, by the demuxer when it detects
        // the amount and nature of streams.
       
        // set the pipeline to playing state
        logger.info(" pipeline now playing....and ") ;
        pipeline.setState(State.PLAYING) ;
        logger.info(" Pipeline state is " + pipeline.getState()) ;
       
       
        loop.run() ;
        //TODO - What do I do here ?
        logger.info(" returned ..stopping playback") ;
        pipeline.setState(State.NULL) ;
       
       
       
    }
}

Command Pattern

Why this pattern has name as 'Command' ? Because someone gives a command and not care how..who will do it...

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