private void button1_Click(object sender, EventArgs e)
        {
            //输入参数
            string parameter = ":sout=#transcode{vcodec=h264,acodec=mpga,ab=128,channels=2,samplerate=44100}:file{dst=D:\\123.mp4,overwrite} :sout-all :sout-keep";

            //this.axVLCPlugin21.AutoPlay = true;
            ////判断是否正在播放
            //if (this.axVLCPlugin21.playlist.isPlaying)
            //{
            //    //如果正在播放, 则停止
            //    this.axVLCPlugin21.playlist.stop();
            //}

            //清空播放列表
            this.axVLCPlugin21.playlist.clear();

            //添加播放列表
            this.axVLCPlugin21.playlist.add("http://192.168.1.168:80/vga", null, parameter);

            //播放列表更新到新添加的播放项
            //this.axVLCPlugin21.playlist.next();
            //播放
            this.axVLCPlugin21.playlist.play();

        }