我目前正在与JMF一起玩,以将视频嵌入到我的GUI中。我的课程很好看,但是我却不断收到奇怪的堆栈跟踪信息,这使我挠头。
Failed to configure: com.sun.media.PlaybackEngine@1fc4bec
Bad header in the media: IOException when parsing hdrl
Error: Unable to realize com.sun.media.PlaybackEngine@1fc4bec
javax.media.CannotRealizeException
at javax.media.Manager.blockingCall(Manager.java:2005)
at javax.media.Manager.createRealizedPlayer(Manager.java:554)
at EmbeddedPlayer.<init>(EmbeddedPlayer.java:24)
at MenuFrame.addMedia(MenuFrame.java:142)
at ConfigReader.parse(ConfigReader.java:362)
at ConfigReader.findFrames(ConfigReader.java:60)
at ConfigReader.main(ConfigReader.java:32)
Exception in thread "main" java.lang.NullPointerException
at EmbeddedPlayer.<init>(EmbeddedPlayer.java:35)
at MenuFrame.addMedia(MenuFrame.java:142)
at ConfigReader.parse(ConfigReader.java:362)
at ConfigReader.findFrames(ConfigReader.java:60)
at ConfigReader.main(ConfigReader.java:32)
seek: java.io.IOException: Negative seek offset
我仅用Java进行开发一年,但我不确定现在的轨迹告诉我什么。
任何帮助,甚至只是告诉我正在发生的事情都将大有帮助。
这是EmbeddedPlayer:
import java.awt.BorderLayout;
import java.awt.Component;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Player;
import javax.swing.JPanel;
@SuppressWarnings("serial")
public class EmbeddedPlayer extends JPanel {
private MenuFrame parent;
public static final String DEFAULT_MEDIA_PATH = "media/";
public EmbeddedPlayer(MenuFrame parent, String file) {
this.parent = parent;
setLayout( new BorderLayout() );
Manager.setHint(Manager.LIGHTWEIGHT_RENDERER, true);
Player mediaPlayer = null;
Component video = null;
Component controls = null;
try {
MediaLocator location = new MediaLocator(file);
mediaPlayer = Manager.createRealizedPlayer(location);
video = mediaPlayer.getVisualComponent();
controls = mediaPlayer.getControlPanelComponent();
} catch (Exception e) {
e.printStackTrace();
}
if ( video != null ) { add(video, BorderLayout.CENTER); }
if ( controls != null ) { add(controls, BorderLayout.SOUTH); }
this.parent.add(this);
mediaPlayer.start();
}
}
根据以下示例:http://www.deitel.com/articles/java_tutorials/20060422/PlayingVideowithJMF/
最佳答案
我相信EmbeddedPlayer是您的代码(而不是jmf),因此您需要在EmbeddedPlayer.java的第35行中检查引用了哪个对象。或发布EmbeddedPlayer的代码。
更新:问题似乎无法创建播放引擎。
也许这个网址会帮助http://blog.msbbc.co.uk/2007/06/mp3-playback-in-java.html