VLJC停止网络摄像头流

Question

我尝试使用VLJC流式传输网络摄像头，但如何停止网络摄像头流？这是我启动网络摄像头的代码：

private static void VCVideo() {

    MediaPlayerFactory mediaPlayerFactory = new MediaPlayerFactory();
    EmbeddedMediaPlayer mediaPlayerForVC = mediaPlayerFactory.newEmbeddedMediaPlayer();
    EmbeddedMediaPlayer mediaPlayerForDRV = mediaPlayerFactory.newEmbeddedMediaPlayer();
    mediaPlayerForVC.setVideoSurface(mediaPlayerFactory.newVideoSurface(canvasMainCamera_VC));

    mediaPlayerForVC.playMedia(CAM_VC_ADDRESS);
}

mediaPlayerForVC.stop()给我一个异常错误。我也无法使用mediaPlayerForVC.saveSnapshot(file)拍摄快照。它也给了我一个异常错误。我在这里做错了什么？