关键代码如下：
captureDeviceInfo = CaptureDeviceManager.getDevice("vfw:Microsoft WDM Video Capture (Win32):0"); // 这里放置的是视频驱动
mediaLocator = new MediaLocator("vfw://0");//视频地址
imagePanel = new ImagePanel();
capture = new JButton("拍照");
capture.addActionListener(this);
DataSource ds = new DataSource();
ds.setLocator(mediaLocator);
try {
player = Manager.createRealizedPlayer(mediaLocator);
每次运行到这就报错，什么原因？？？（javax.media.NoPlayerException: Cannot find a Player for :vfw://0）
player.start();