The VideoLAN Forums

Posted: **18 Mar 2019 15:58**

Hi,
I'm trying, in my java application, to use libvlc to play a audio stream.
My environment is this:

vlcj: (Info.java:70) | INFO | vlcj: 2.4.1
vlcj: (Info.java:71) | INFO | java: 1.8.0_181 Oracle Corporation
vlcj: (Info.java:72) | INFO | java home: /usr/lib/jvm/java-8-openjdk-armhf/jre
vlcj: (Info.java:73) | INFO | os: Linux 4.9.88-10179-ga2cc75c7c427-dirty arm

when I call this function:
AudioMediaPlayerComponent mediaPlayerComponent=new AudioMediaPlayerComponent()
my application fails and displays a segmentation fault error.
I reported all output when i run my application:

java -Djna.debug_load.jna=true -Djna.library.path=/usr/lib/arm-linux-gnueabihf -Dvlcj.log=DEBUG -jar player.jar

Mar 18, 2019 2:33:17 PM com.sun.jna.Native extractFromResourcePath
INFO: Looking in classpath from sun.misc.Launcher$AppClassLoader@d93b30 for /com/sun/jna/linux-arm/libjnidispatch.so
Mar 18, 2019 2:33:17 PM com.sun.jna.Native extractFromResourcePath
INFO: Found library resource at jar:file:/home/x_user/NetBeansProjects/player/dist/lib/jna-5.2.0.jar!/com/sun/jna/linux-arm/libjnidispatch.so
Mar 18, 2019 2:33:17 PM com.sun.jna.Native extractFromResourcePath
INFO: Extracting library to /root/.cache/JNA/temp/jna1853999980795198447.tmp
Mar 18, 2019 2:33:17 PM com.sun.jna.Native loadNativeDispatchLibraryFromClasspath
INFO: Trying /root/.cache/JNA/temp/jna1853999980795198447.tmp
Mar 18, 2019 2:33:17 PM com.sun.jna.Native loadNativeDispatchLibraryFromClasspath
INFO: Found jnidispatch at /root/.cache/JNA/temp/jna1853999980795198447.tmp
vlcj: (MediaPlayerFactory.java:131) | DEBUG | Trying workaround for Java7 on Linux
vlcj: (MediaPlayerFactory.java:137) | DEBUG | Attempting to load jawt...
vlcj: (MediaPlayerFactory.java:139) | DEBUG | ...loaded jawt
vlcj: (MediaPlayerFactory.java:147) | DEBUG | Java7 on Linux workaround complete.
vlcj: (Info.java:70) | INFO | vlcj: 2.4.1
vlcj: (Info.java:71) | INFO | java: 1.8.0_181 Oracle Corporation
vlcj: (Info.java:72) | INFO | java home: /usr/lib/jvm/java-8-openjdk-armhf/jre
vlcj: (Info.java:73) | INFO | os: Linux 4.9.88-10179-ga2cc75c7c427-dirty arm
vlcj: (LibVlcFactory.java:164) | INFO | vlc: 3.0.6 Vetinari, changeset 3.0.6-0-g5803e85f73
vlcj: (LibVlcFactory.java:165) | INFO | libvlc: /usr/lib/arm-linux-gnueabihf/libvlc.so
vlcj: (MediaPlayerFactory.java:236) | DEBUG | MediaPlayerFactory(libvlc=Proxy interface to Native Library </usr/lib/arm-linux-gnueabihf/libvlc.so@1646186488>,libvlcArgs=[--ignore-config, --no-plugins-cache, --quiet, --quiet-synchro, --intf=dummy])
vlcj: (MediaPlayerFactory.java:238) | DEBUG | jna.library.path=/usr/lib/arm-linux-gnueabihf
Segmentation fault

How can I resolve this issue?

Posted: **18 Mar 2019 16:09**

Hi, can you provide some code / a calltrace ?

Posted: **18 Mar 2019 16:22**

Hi,
my main class is this:

Code: Select all

package player;

/**
 *
 * @author x_user
 */
public class Player {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        PlayerInstance pl_Instance = new PlayerInstance("http://shoutcast.rtl.it:3010/");

        pl_Instance.start();
        while (true) {
        }
    }
    
}

new PlayerInstance("http://shoutcast.rtl.it:3010/") calls the constructor of this class:

Code: Select all

package player;


import uk.co.caprica.vlcj.binding.internal.libvlc_media_t;
import uk.co.caprica.vlcj.component.AudioMediaPlayerComponent;
import uk.co.caprica.vlcj.player.MediaPlayer;
import uk.co.caprica.vlcj.player.MediaPlayerEventAdapter;



/**
 * A single player instance.
 */
public class PlayerInstance extends MediaPlayerEventAdapter {

    private  AudioMediaPlayerComponent mediaPlayerComponent;

    
    private final String url;

    public PlayerInstance(String stringUrl) {

        url=stringUrl;
        try{
        mediaPlayerComponent = new AudioMediaPlayerComponent(); //when execute this I have segmentation fault
       
        mediaPlayerComponent.getMediaPlayer().addMediaPlayerEventListener(new MediaPlayerEventAdapter() {
            @Override
            public void stopped(MediaPlayer mediaPlayer) {
//                LOGGER.error("Evento Vlcj: Stopped");
                start();

            }

            @Override
            public void finished(MediaPlayer mediaPlayer) {
//                LOGGER.error("Evento Vlcj: Finished");
                mediaPlayer.stop();
                start();

            }

            @Override
            public void error(MediaPlayer mediaPlayer) {
//                LOGGER.error("Evento Vlcj: Error");
                mediaPlayer.stop();
                start();

            }

            @Override
            public void playing(MediaPlayer mediaPlayer) {

//                LOGGER.debug("Evento Vlcj: Playing");

            }

            @Override
            public void paused(MediaPlayer mediaPlayer) {

//                LOGGER.debug("Evento Vlcj: Paused");
            }


            @Override
            public void opening(MediaPlayer mediaPlayer) {

//                LOGGER.debug("Evento Vlcj: Opening...");
            }

            @Override
            public void mediaChanged(MediaPlayer mediaPlayer, libvlc_media_t media, String mrl) {
//                LOGGER.debug("Evento Vlcj: mediaChanged");
            }

            @Override
            public void buffering(MediaPlayer mediaPlayer, float newCache) {
//                LOGGER.debug("Evento Vlcj: buffering newCache: " + newCache);

            }

            @Override
            public void lengthChanged(MediaPlayer mediaPlayer, long newLength) {
//                LOGGER.debug("Evento Vlcj: lengthChanged");
            }

            @Override
            public void mediaStateChanged(MediaPlayer mediaPlayer, int newCount) {
//                LOGGER.debug("Evento Vlcj: mediaStateChanged newCount " + newCount);
            }
        });
         }catch(Exception ex){
            ex.getCause();
        }

    }

    public void start() {
        mediaPlayerComponent.getMediaPlayer().playMedia(url);
    }

    public void exit(int result) {
        mediaPlayerComponent.release();
        System.exit(result);
    }

}

Posted: **18 Mar 2019 17:36**

Hi, it doesn't seem to be libvlc-jni bindings so it's hard to guess.
You should follow the project guidelines https://github.com/caprica/vlcj#support

Posted: **19 Mar 2019 12:06**

Thank you,
the issue is the old vlcj jar that I used.
Using vlcj-3.12.1. jar with all dependencies jar that are in directory that I download from this link http://capricasoftware.co.uk/projects/v ... stallation I resolved the problem.

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