Examples of org.gstreamer.Structure$InvalidFieldException

org.gstreamer.Structure
Generic structure containing fields of names and values.
A Structure is a collection of key/value pairs. The keys are expressed as GQuarks and the values can be of any GType.
In addition to the key/value pairs, a Structure also has a name. The name starts with a letter and can be followed by letters, numbers and any of "/-_.:".
Structure is used by various GStreamer subsystems to store information in a flexible and extensible way.
A Structure can be created with new {@link #Structure(String)} or {@link #Structure(String,String,Object)}, which both take a name and an optional set of key/value pairs along with the types of the values.
Field values can be changed with set{Integer,String}() etc functions.
Field values can be retrieved with get{Integer,String}() etc functions.
Fields can be removed with {@link #removeField} or {@link #removeFields} @see Caps @see Event

                    s.getInteger("button"));
        }
    }
    private static final class KeyEvent extends NavigationEvent {
        public KeyEvent(String event, String key) {
            super(new Structure("application/x-gst-navigation", 
                "event", GType.STRING, event,
                "key", GType.STRING, key));
        }

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         * 
         * @return a string
         */
        @Override
        public String toString() {
            Structure s = getStructure();
            return String.format("%s: [key=%s]",
                    s.getString("event"), s.getString("key"));
        }

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                if (pad.isLinked()) {
                    return;
                }
                /* check media type */
                Caps caps = pad.getCaps();
                Structure struct = caps.getStructure(0);
                if (struct.getName().startsWith("audio/")) {
                    System.out.println("Linking audio pad: " + struct.getName());
                    pad.link(audioBin.getStaticPad("sink"));
                } else if (struct.getName().startsWith("video/")) {
                    System.out.println("Linking video pad: " + struct.getName());
                    pad.link(videoComponent.getElement().getStaticPad("sink"));
                    
                    // Make the video frame visible
                    SwingUtilities.invokeLater(new Runnable() {
                        public void run() {
                            frame.setVisible(true);
                        }
                    });
                } else {
                    System.out.println("Unknown pad [" + struct.getName() + "]");
                }
            }
        });
        Bus bus = pipe.getBus();

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                    return;
                }
  
                /* check media type */
                Caps caps = pad.getCaps();
                Structure struct = caps.getStructure(0);
                if (struct.getName().startsWith("audio/")) {
                    System.out.println("Got audio pad");
                    /* link'n'play */
                    pad.link(audioPad);  
                }

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                    return;
                }
  
                /* check media type */
                Caps caps = pad.getCaps();
                Structure struct = caps.getStructure(0);
                if (struct.getName().startsWith("audio/")) {
                    System.out.println("Got audio pad");
                    /* link'n'play */
                    pad.link(audioPad);  
                }

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                //
                if (!Platform.isWindows()) { 
                    bus.setSyncHandler(new BusSyncHandler() {


                        public BusSyncReply syncMessage(Message msg) {
                            Structure s = msg.getStructure();
                            if (s == null || !s.hasName("prepare-xwindow-id")) {
                                return BusSyncReply.PASS;
                            }
                            XOverlay.wrap(videoSink).setWindowHandle(canvas);
                            return BusSyncReply.DROP;
                        }

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