用java从视频中提取图像

我想知道如何使用JMF从视频中提取图像

Player player = Manager.createRealizedPlayer(cdi.getLocator());
player.start();
FrameGrabbingControl frameGrabber = (FrameGrabbingControl) player.getControl("javax.media.control.FrameGrabbingControl");


//////////////////////////////

private Image grab() {
Buffer buf = frameGrabber.grabFrame();
// Convert frame to an buffered image so it can be processed and saved
Image img = (new BufferToImage((VideoFormat) buf.getFormat()).createImage(buf));
    return img;
}

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