【发布时间】：2018-06-18 18:48:07
【问题描述】：
我正在尝试将 vlcj 与我的 java 应用程序捆绑在一起，但是如果没有本机发现，我无法加载 vlcj。 我的 Java 和 VLC 安装都是 64 位的，所以应该没有问题。使用本机发现时，我可以让我的视频正常播放。 我尝试了 JNA 3.5.2、JNA 4.1.0、JNA 4.5.1 并且都产生了相同的结果
我能得到的最简单的例子：
public class Test {
private final JFrame frame;
private final EmbeddedMediaPlayerComponent mediaPlayerComponent;
public static void main(final String[] args) {
NativeLibrary.addSearchPath(RuntimeUtil.getLibVlcLibraryName(), "C:\\Program Files\\VideoLAN\\VLC");
System.setProperty("VLC_PLUGIN_PATH", "C:\\Program Files\\VideoLAN\\VLC\\plugins");
System.out.println(LibVlc.INSTANCE.libvlc_get_version());
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Test(args);
}
});
}
public Test(String[] args) {
frame = new JFrame("My First Media Player");
frame.setBounds(100, 100, 600, 400);
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
mediaPlayerComponent.release();
System.exit(0);
}
});
mediaPlayerComponent = new EmbeddedMediaPlayerComponent();
}
}
堆栈跟踪：
[main] INFO uk.co.caprica.vlcj.Info - vlcj: 3.10.1
[main] INFO uk.co.caprica.vlcj.Info - java: 10.0.1 Oracle Corporation
[main] INFO uk.co.caprica.vlcj.Info - java home: C:\Program Files\Java\jdk-10.0.1
[main] INFO uk.co.caprica.vlcj.Info - os: Windows 10 10.0 amd64
3.0.3 Vetinari
[AWT-EventQueue-0] INFO uk.co.caprica.vlcj.binding.LibVlcFactory - vlc: 3.0.3 Vetinari, changeset 3.0.3-1-0-gc2bb759264
[AWT-EventQueue-0] INFO uk.co.caprica.vlcj.binding.LibVlcFactory - libvlc: C:\Program Files\VideoLAN\VLC\libvlc.dll
[AWT-EventQueue-0] ERROR uk.co.caprica.vlcj.player.MediaPlayerFactory - Failed to initialise libvlc
Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: Failed to initialise libvlc.
This is most often caused either by an invalid vlc option being passed when creating a MediaPlayerFactory or by libvlc being unable to locate the required plugins.
If libvlc is unable to locate the required plugins the instructions below may help:
In the text below <libvlc-path> represents the name of the directory containing "libvlc.dll" and "libvlccore.dll" and <plugins-path> represents the name of the directory containing the vlc plugins...
For libvlc to function correctly the vlc plugins must be available, there are a number of different ways to achieve this:
1. Make sure the plugins are installed in the "<libvlc-path>/plugins" directory, this should be the case with a normal vlc installation.
2. Set the VLC_PLUGIN_PATH operating system environment variable to point to "<plugins-path>".
More information may be available in the log.
at uk.co.caprica.vlcj.player.MediaPlayerFactory.<init>(MediaPlayerFactory.java:300)
at uk.co.caprica.vlcj.player.MediaPlayerFactory.<init>(MediaPlayerFactory.java:259)
at uk.co.caprica.vlcj.component.EmbeddedMediaPlayerComponent.onGetMediaPlayerFactory(EmbeddedMediaPlayerComponent.java:349)
at uk.co.caprica.vlcj.component.EmbeddedMediaPlayerComponent.<init>(EmbeddedMediaPlayerComponent.java:217)
at vlctest.Test.<init>(Test.java:46)
at vlctest.Test$1.run(Test.java:30)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
at java.desktop/java.awt.EventQueue.access$600(EventQueue.java:97)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
知道可能是什么原因吗？
【问题讨论】：
-
顺便说一下，
System.setProperty属性不是系统环境属性。如果您使用终端启动程序或在 IDE 的运行选项中，则可以通过终端设置环境变量。 -
感谢cubrr，您确实为我指明了正确的方向。它现在在 eclipse 中运行，并设置了环境变量。我认为 vlcj 一直在不设置环境变量的情况下工作。因此，如果我理解正确，我需要做的就是将 env var 设置为插件路径，我可以通过简单地创建一个批处理文件来设置 env var 然后运行我的 jar 文件，或者更好地编写一个小的基本相同的 C 程序。