mac os jdk 1.8问题vlc控制JAWT无法加载

Question

JavaVM WARNING: JAWT_GetAWT must be called after loading a JVM
Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError: Can't load JAWT
    at com.sun.jna.Native.getWindowHandle0(Native Method)
    at com.sun.jna.Native$AWT.getComponentID(Native.java:1879)
    at com.sun.jna.Native.getComponentID(Native.java:253)
    at uk.co.caprica.vlcj.player.embedded.videosurface.CanvasVideoSurface.attach(CanvasVideoSurface.java:69)
    at uk.co.caprica.vlcj.player.embedded.DefaultEmbeddedMediaPlayer.attachVideoSurface(DefaultEmbeddedMediaPlayer.java:156)
    at uk.co.caprica.vlcj.player.embedded.DefaultEmbeddedMediaPlayer.onBeforePlay(DefaultEmbeddedMediaPlayer.java:315)
    at uk.co.caprica.vlcj.player.DefaultMediaPlayer.play(DefaultMediaPlayer.java:705)
    at uk.co.caprica.vlcj.player.DefaultMediaPlayer.playMedia(DefaultMediaPlayer.java:222)
    at viziosecure360.Travizia.AddPlayer(Travizia.java:675)
    at viziosecure360.Travizia.setDefault(Travizia.java:234)
    at viziosecure360.Travizia$1.run(Travizia.java:187)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:744)
    at java.awt.EventQueue.access$400(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:697)
    at java.awt.EventQueue$3.run(EventQueue.java:691)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:714)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

Answer 1

vlcj/LibVLC需要一个重量级的AWT组件来呈现其视频.

在OSX上JDK 1.7及更高版本中不再有任何AWT.OSX上的UI工具包现在完全轻量级.

因此,在OSX上使用vlcj的最佳方式不再有效.

你要做的就是使用所谓的"直接"媒体播放器[1]而不是"嵌入式" 播放器.

使用直接媒体播放器的缺点是你必须以某种方式自己渲染视频,使用BufferedImage,硬件加速易失性图像,PixelWriter或其他东西.

这种方法通常使用更多的内存和更多的CPU,并且更加不方便.

从好的方面来说,使用这种方法可以实现流畅的高清视频播放.

另外,如果需要,您可以以某种方式处理视频缓冲区,并使用此方法轻松地在视频上叠加轻量级窗口小部件/标签.

vlcj测试源中提供了一个示例,其中显示了一种如何执行此操作的方法(此处有太多代码要重现,因此我将提供稳定的链接[2]).

关于这个问题的项目问题跟踪器[3]也有很长的讨论.

[1] http://caprica.github.io/vlcj/javadoc/3.0.0/uk/co/caprica/vlcj/player/direct/DirectMediaPlayer.html

[2] https://github.com/caprica/vlcj/blob/vlcj-3.0.1/src/test/java/uk/co/caprica/vlcj/test/direct/DirectTestPlayer.java

[3] https://github.com/caprica/vlcj/issues/205

令人惊讶的是,有一种潜在的,但显然不是最佳的解决方案,即使用Wine在OSX上使用Windows 1.7/1.8 JVM.我没有尝试过,但我被告知它有效.