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我在使用 vlcj 播放 youtube 视频时遇到问题。直到上周左右一切正常。我打电话给 mediaPlayer.playMedia(" http://www.youtube.com/watch?v=1t8fl96HPQI ") 并且工作正常，但现在不行了。它根本不会产生任何错误。请注意，我可以播放本地文件和其他在线流媒体网址，但不能播放 youtube 视频。

这是我正在使用的代码。（基本上它是一个现成的例子）

/*
 * This file is part of VLCJ.
 *
 * VLCJ is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * VLCJ is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with VLCJ.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * Copyright 2009, 2010, 2011 Caprica Software Limited.
 */

package com.javacodegeeks.youtube.test;

import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.List;

import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.border.EmptyBorder;

import uk.co.caprica.vlcj.binding.internal.libvlc_media_t;
import uk.co.caprica.vlcj.player.MediaPlayer;
import uk.co.caprica.vlcj.player.MediaPlayerEventAdapter;
import uk.co.caprica.vlcj.player.MediaPlayerFactory;
import uk.co.caprica.vlcj.player.embedded.EmbeddedMediaPlayer;
import uk.co.caprica.vlcj.test.VlcjTest;

/**
 * A minimal YouTube player.
 * <p>
 * The URL/MRL must be in the following format:
 * <pre>
 *   http://www.youtube.com/watch?v=000000
 * </pre>
 * The only thing that makes this different from a 'regular' media player
 * application is the following piece of code:
 * <pre>
 *   mediaPlayer.setPlaySubItems(true); // <--- This is very important for YouTube media
 * </pre>
 * Note that it is also possible to programmatically play the sub-item in 
 * response to events - this is slightly more complex but more flexible.
 * <p>
 * The YouTube web page format changes from time to time. This means that the
 * lua scripts that vlc provides to parse the YouTube web pages when looking
 * for the media to stream may not work. If you get errors, especially errors
 * alluding to malformed urls, then you may need to update your vlc version to
 * get newer lua scripts.
 */
public class NewClass extends VlcjTest {

  private MediaPlayerFactory factory;
  private EmbeddedMediaPlayer mediaPlayer;
  private Frame mainFrame;

  private JLabel urlLabel;
  private JTextField urlTextField;
  private JButton playButton;

  public static void main(String[] args) throws Exception {
    setLookAndFeel();

    SwingUtilities.invokeLater(new Runnable() {
      @Override
      public void run() {
        new NewClass().start();
      }
    });
  }

  public NewClass() {
    mainFrame = new Frame("vlcj YouTube Test");
    mainFrame.setIconImage(new ImageIcon(getClass().getResource("/icons/vlcj-logo.png")).getImage());
    mainFrame.setSize(800, 600);
    mainFrame.addWindowListener(new WindowAdapter() {
      @Override
      public void windowClosing(WindowEvent e) {
        exit(0);
      }
    });
    mainFrame.setLayout(new BorderLayout());

    JPanel cp = new JPanel();
    cp.setBackground(Color.black);
    cp.setLayout(new BorderLayout());

    JPanel ip = new JPanel();
    ip.setBorder(new EmptyBorder(4, 4, 4, 4));
    ip.setLayout(new BoxLayout(ip, BoxLayout.X_AXIS));

    urlLabel = new JLabel("URL:");
    urlLabel.setDisplayedMnemonic('u');
    urlLabel.setToolTipText("Enter a URL in the format http://www.youtube.com/watch?v=000000");
    urlTextField = new JTextField(40);
    urlTextField.setFocusAccelerator('u');
    urlTextField.setToolTipText("Enter a URL in the format http://www.youtube.com/watch?v=000000");
    playButton = new JButton("Play");
    playButton.setMnemonic('p');

    ip.add(urlLabel);
    ip.add(urlTextField);
    ip.add(playButton);

    cp.add(ip, BorderLayout.NORTH);

    Canvas vs = new Canvas();
    vs.setBackground(Color.black);
    cp.add(vs, BorderLayout.CENTER);

    mainFrame.add(cp, BorderLayout.CENTER);

    urlTextField.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        play();
      }
    });

    playButton.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        play();
      }
    });

    factory = new MediaPlayerFactory();

    mediaPlayer = factory.newEmbeddedMediaPlayer();
    mediaPlayer.setVideoSurface(factory.newVideoSurface(vs));

    mediaPlayer.setPlaySubItems(true); // <--- This is very important for YouTube media

    mediaPlayer.addMediaPlayerEventListener(new MediaPlayerEventAdapter() {
      @Override
      public void mediaSubItemAdded(MediaPlayer mediaPlayer, libvlc_media_t subItem) {
        List<String> items = mediaPlayer.subItems();
        System.out.println(items);
        System.out.println(mediaPlayer.subItemCount());
      }
    });
  }

  private void start() {
    mainFrame.setVisible(true);
  }

  private void play() {
    String mrl = urlTextField.getText();
    mediaPlayer.playMedia(mrl);

  }

  private void exit(int value) {
    mediaPlayer.stop();
    mediaPlayer.release();
    factory.release();
    System.exit(value);
  }

  /**
   * Set the cross platform look and feel.
   * 
   * @throws Exception if an error occurs
   */

//  private static void setLookAndFeel() throws Exception {
//    String lookAndFeelClassName = null;
//    LookAndFeelInfo[] lookAndFeelInfos = UIManager.getInstalledLookAndFeels();
//    for(LookAndFeelInfo lookAndFeel : lookAndFeelInfos) {
//      if("Nimbus".equals(lookAndFeel.getName())) {
//        lookAndFeelClassName = lookAndFeel.getClassName();
//      }
//    }
//    if(lookAndFeelClassName == null) {
//      lookAndFeelClassName = UIManager.getSystemLookAndFeelClassName();
//    }
//    UIManager.setLookAndFeel(lookAndFeelClassName);
//  }
}

对于 youtube 视频，您需要以下代码：

mediaPlayer.setPlaySubItems(true); // <--- This is very important for YouTube media

下面的代码获取所有子项。

mediaPlayer.addMediaPlayerEventListener(new MediaPlayerEventAdapter() {
      @Override
      public void mediaSubItemAdded(MediaPlayer mediaPlayer, libvlc_media_t subItem) {
        List<String> items = mediaPlayer.subItems();
        System.out.println(items);
        System.out.println(mediaPlayer.subItemCount());
      }
    });

当它工作时，我注意到上面的代码正在打印 2 个子项，其中一个是视频的实际 url。

但现在它只打印一个像这样的子项：

[http://www.youtube.com/get_video_info?video_id=1t8fl96HPQI&el=detailpage]

这不是视频的实际网址，我认为这就是不播放的原因。

关于为什么会发生这种情况的任何想法？谷歌是否改变了他们 youtube 页面的格式？

我尝试按照我找到的教程中的建议升级 vlc youtube.lua 文件，但没有运气。

此外，当我在 vlc 中使用相同的链接时，它工作正常。

眼镜：

Ubuntu 12.0.4 64 位

VLC 媒体播放器 2.0.5 双花

vlcj 2.2.0

提前致谢，

马里奥斯

4

1 回答 1

0

谷歌是否改变了他们 youtube 页面的格式？

最有可能的。这种情况一直都在发生，以至于我在我的应用程序中不依赖这个功能（即使如果可以的话它会很好。）这太喜怒无常了，对 Youtube 布局的一个小改动就停止了在职的。我不确定 VLCJ 使用的 Lua 文件是否与 VLC 的安装相同（尽管我可能在那里错了。）

于 2013-04-25T12:19:08.850 回答