C#读取视频的宽度和高度等信息的方法

/// <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;
    }
}