视频文件信息读取器

最近想要整理mtv，特意写了这个读取多种视频文件信息的辅助工具，包括mpg，avi，wmv，flv，rm，rmvb等。
原理：我只是做了个壳，实质是用ffmpeg.exe读取视频信息。

 

    public class cVideoInfo
    {
        private string _FileName;   //video file fullname
        private string _Info;      //all info
        private string _Name;       // vide name
        private string _Ext;        // file ext name        
        private string _Duration;
        private string _BitRate;
        private string _Size;
        private string _FileSize;


        public cVideoInfo(string FileName)
        {           
            _FileName = FileName;
            _Info = "";
            _Name = FileName.Substring(FileName.LastIndexOf("\\") + 1, FileName.LastIndexOf(".") - FileName.LastIndexOf("\\") - 1);
            _Ext = FileName.Substring(FileName.LastIndexOf(".") + 1);
            _Duration = "";
            _BitRate = "";
            _Size = "";
            _FileSize = "";

            FileInfo fi = new FileInfo(_FileName);
            if (!fi.Exists)
                return;
            else
                _FileSize = fi.Length.ToString();
            //这段代码的参考网上的
            Process p = new Process();//建立外部调用线程
            p.StartInfo.FileName = "ffmpeg.exe";//要调用外部程序的绝对路径
            p.StartInfo.Arguments = "-i \"" + _FileName + "\"";//参数(这里就是FFMPEG的参数了)            
            p.StartInfo.UseShellExecute = false;//不使用操作系统外壳程序启动线程(一定为FALSE,详细的请看MSDN)
            p.StartInfo.RedirectStandardError = true;//把外部程序错误输出写到StandardError流中(这个一定要注意,FFMPEG的所有输出信息,都为错误输出流,用StandardOutput是捕获不到任何消息的这是我耗费了2个多月得出来的经验mencoder就是用standardOutput来捕获的)
            p.StartInfo.CreateNoWindow = true;//不创建进程窗口
            p.ErrorDataReceived += new DataReceivedEventHandler(CatchOutputInfo);//外部程序(这里是FFMPEG)输出流时候产生的事件,这里是把流的处理过程转移到下面的方法中,详细请查阅MSDN
            p.Start();//启动线程
            p.BeginErrorReadLine();//开始异步读取
            p.WaitForExit();//阻塞等待进程结束
            p.Close();//关闭进程
            p.Dispose();//释放资源
        }

        public string FileName
        {
            get
            {
                return _FileName;
            }
        }

        public string Info
        {
            get
            {
                return _Info;
            }
        }

        public string Name
        {
            get
            {
                return _Name;
            }
        }

        public string Ext
        {
            get
            {
                return _Ext;
            }
        }
        
        public string Duration
        {
            get
            {
                return _Duration;
            }
        }

        public string BitRate
        {
            get
            {
                return _BitRate;
            }
        }

        public string Size
        {
            get
            {
                return _Size;
            }
        }

        public string FileSize
        {
            get
            {
                return _FileSize;
            }            
        }

        private void CatchOutputInfo(object sendProcess, DataReceivedEventArgs OutputInfo)
        {
            string sOutputInfo = OutputInfo.Data;
            int iStart = 0, iEnd = 0;

            if (!String.IsNullOrEmpty(sOutputInfo))
            {
                _Info = _Info + "\r\n" + sOutputInfo;


                //Duration ,BitRate
                if (sOutputInfo.IndexOf("Duration") >= 0)
                {
                    iStart = sOutputInfo.IndexOf(":") + 1;
                    iEnd = sOutputInfo.IndexOf(".", iStart);
                    _Duration = sOutputInfo.Substring(iStart, iEnd - iStart);

                    iStart = sOutputInfo.IndexOf("bitrate") + 8;
                    _BitRate = sOutputInfo.Substring(iStart);
                }

                //Size
                if (sOutputInfo.IndexOf("Video") >= 0)
                {
                    if (_Ext.Substring(0,2).ToLower() == "rm")
                    {
                        iStart = sOutputInfo.IndexOf(",") + 1;
                        iEnd = sOutputInfo.IndexOf(",", iStart);
                    }
                    else
                    {
                        iStart = sOutputInfo.IndexOf(",") + 1;
                        iStart = sOutputInfo.IndexOf(",", iStart) + 1;
                        iEnd = sOutputInfo.IndexOf(",", iStart);
                    }
                    _Size = sOutputInfo.Substring(iStart, iEnd - iStart);
                }
            }
        }
    }