public static void Run(string cmd)
        {
            try
            {
                string ffmpeg = AppDomain.CurrentDomain.BaseDirectory + "ffmpeg.exe";
                ProcessStartInfo startInfo = new ProcessStartInfo(ffmpeg);
                startInfo.UseShellExecute = false;
                startInfo.CreateNoWindow = true;
                startInfo.WindowStyle = ProcessWindowStyle.Hidden;
                startInfo.Arguments = cmd;
                Process process = Process.Start(startInfo);
                process.WaitForExit(5000);
                process.Kill();
            }
            catch { }
        }

        /// <summary>
        /// 分割視頻
        /// </summary>
        /// <param name="videoPath">視頻路徑</param>
        /// <param name="outPath">輸出圖片路徑</param>
        public static void Split(string videoPath, string outPath)
        {
            Run(string.Format(" -i {0}  -r 10 -y -f image2 -ss 00:00:01 {1}\\%d.jpg", videoPath, outPath));
        }

        /// <summary>
        /// 按時間獲取某幀圖片
        /// </summary>
        /// <param name="videoPath">視頻路徑</param>
        /// <param name="outPath">輸出圖片路徑</param>
        /// <param name="frameTime">時間(格式：00:00:01)</param>
        public static void GetFrame(string videoPath, string outPath, string frameTime)
        {
            Run(string.Format("-ss 00:00:01 -i {1} {2}", frameTime, videoPath, outPath));
        }

private void btn_select_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = "視頻|*.mp4;*.avi";
            ofd.Title = "請選擇視頻文件";
            ofd.InitialDirectory = Application.StartupPath;
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                axWindowsMediaPlayer1.URL = ofd.FileName;
                string outPath = Application.StartupPath + "\\cover.jpg";
                FFmpegUtil.GetFrame(ofd.FileName, outPath, "00:00:01");
                pictureBox1.Image = Image.FromFile(outPath);
            }
        }

        private void btn_split_Click(object sender, EventArgs e)
        {
            if(!File.Exists(axWindowsMediaPlayer1.URL)){
                MessageBox.Show("未選擇視頻");
                return;
            }
            FolderBrowserDialog fbd = new FolderBrowserDialog();
            fbd.Description = "選擇存儲位置";
            fbd.ShowNewFolderButton = true;
           if (fbd.ShowDialog() == DialogResult.OK)
            {
                string[] files = Directory.GetFiles(fbd.SelectedPath);
                foreach (string file in files)
                {
                    File.Delete(file);
                }
                FFmpegUtil.Split(axWindowsMediaPlayer1.URL, fbd.SelectedPath);
                if (MessageBox.Show("視頻分割完成,是否打開文件夾?", "提示", MessageBoxButtons.YesNo) == DialogResult.Yes)
                {
                    Process.Start(fbd.SelectedPath);
                }
            }

        }