/// <summary> /// 执行一条command命令 /// </summary> /// <param name="command">需要执行的Command</param> /// <param name="output">输出</param> /// <param name="error">错误</param> public static void ExecuteCommand(string command,out string output,out string error) {     try     {  //创建一个进程  Process pc = new Process();  pc.StartInfo.FileName = command;  pc.StartInfo.UseShellExecute = false;  pc.StartInfo.RedirectStandardOutput = true;  pc.StartInfo.RedirectStandardError = true;  pc.StartInfo.CreateNoWindow = true;  //启动进程  pc.Start();  //准备读出输出流和错误流  string outputData = string.Empty;  string errorData = string.Empty;  pc.BeginOutputReadLine();  pc.BeginErrorReadLine();    pc.OutputDataReceived += (ss, ee) =>      {   outputData += ee.Data;      };  pc.ErrorDataReceived += (ss, ee) =>      {   errorData += ee.Data;      };    //等待退出  pc.WaitForExit();  //关闭进程  pc.Close();  //返回流结果  output = outputData;  error = errorData;     }     catch(Exception)     {  output = null;  error = null;     } }

/// <summary> /// 获取视频的帧宽度和帧高度 /// </summary> /// <param name="videoFilePath">mov文件的路径</param> /// <returns>null表示获取宽度或高度失败</returns> public static void GetMovWidthAndHeight(string videoFilePath, out int? width, out int? height) {     try     {  //判断文件是否存在  if (!File.Exists(videoFilePath))  {      width = null;      height = null;  }  //执行命令获取该文件的一些信息  string ffmpegPath = new FileInfo(Process.GetCurrentProcess().MainModule.FileName).DirectoryName + @"\ffmpeg.exe";  string output;  string error;  Helpers.ExecuteCommand("\"" + ffmpegPath + "\"" + " -i " + "\"" + videoFilePath + "\"",out output,out error);  if(string.IsNullOrEmpty(error))  {      width = null;      height = null;  }  //通过正则表达式获取信息里面的宽度信息  Regex regex = new Regex("(\\d{2,4})x(\\d{2,4})", RegexOptions.Compiled);  Match m = regex.Match(error);  if (m.Success)  {      width = int.Parse(m.Groups[1].Value);      height = int.Parse(m.Groups[2].Value);  }  else  {      width = null;      height = null;  }     }     catch (Exception)     {  width = null;  height = null;     } }