C#调用mmpeg进行各种视频转换的类实例

using System.Web;using System.Configuration;namespace DotNet.Utilities{  //if (this.fload.HasFile)  //{  //  string upFileName = HttpContext.Current.Server.MapPath("~/savefile") + "//" + this.fload.PostedFile.FileName;  //  string saveName  = DateTime.Now.ToString("yyyyMMddHHmmssffff");  //  string playFile  = Server.MapPath(VideoConvert.savefile + saveName);  //  string imgFile  = Server.MapPath(VideoConvert.savefile + saveName);  //  VideoConvert pm = new VideoConvert();  //  string m_strExtension = VideoConvert.GetExtension(this.fload.PostedFile.FileName).ToLower();  //  if (m_strExtension == "flv")  //  {  //    System.IO.File.Copy(upFileName, playFile + ".flv");  //    pm.CatchImg(upFileName, imgFile);  //  }  //  string Extension = pm.CheckExtension(m_strExtension);  //  if (Extension == "ffmpeg")  //  {  //    pm.ChangeFilePhy(upFileName, playFile, imgFile);  //  }  //  else if (Extension == "mencoder")  //  {  //    pm.MChangeFilePhy(upFileName, playFile, imgFile);  //  }  //}  public class VideoConvert : System.Web.UI.Page  {    public VideoConvert()    { }    string[] strArrMencoder = new string[] { "wmv", "rmvb", "rm" };    string[] strArrFfmpeg = new string[] { "asf", "avi", "mpg", "3gp", "mov" };    #region 配置    public static string ffmpegtool = ConfigurationManager.AppSettings["ffmpeg"];    public static string mencodertool = ConfigurationManager.AppSettings["mencoder"];    public static string savefile = ConfigurationManager.AppSettings["savefile"] + "/";    public static string sizeOfImg = ConfigurationManager.AppSettings["CatchFlvImgSize"];    public static string widthOfFile = ConfigurationManager.AppSettings["widthSize"];    public static string heightOfFile = ConfigurationManager.AppSettings["heightSize"];    #endregion    #region 获取文件的名字    /// <summary>    /// 获取文件的名字    /// </summary>    public static string GetFileName(string fileName)    {      int i = fileName.LastIndexOf("//") + 1;      string Name = fileName.Substring(i);      return Name;    }    #endregion    #region 获取文件扩展名    /// <summary>    /// 获取文件扩展名    /// </summary>    public static string GetExtension(string fileName)    {      int i = fileName.LastIndexOf(".") + 1;      string Name = fileName.Substring(i);      return Name;    }    #endregion    #region 获取文件类型    /// <summary>    /// 获取文件类型    /// </summary>    public string CheckExtension(string extension)    {      string m_strReturn = "";      foreach (string var in this.strArrFfmpeg)      {        if (var == extension)        {          m_strReturn = "ffmpeg"; break;        }      }      if (m_strReturn == "")      {        foreach (string var in strArrMencoder)        {          if (var == extension)          {            m_strReturn = "mencoder"; break;          }        }      }      return m_strReturn;    }    #endregion    #region 视频格式转为Flv    /// <summary>    /// 视频格式转为Flv    /// </summary>    /// <param name="vFileName">原视频文件地址</param>    /// <param name="ExportName">生成后的Flv文件地址</param>    public bool ConvertFlv(string vFileName, string ExportName)    {      if ((!System.IO.File.Exists(ffmpegtool)) || (!System.IO.File.Exists(HttpContext.Current.Server.MapPath(vFileName))))      {        return false;      }      vFileName = HttpContext.Current.Server.MapPath(vFileName);      ExportName = HttpContext.Current.Server.MapPath(ExportName);      string Command = " -i /"" + vFileName + "/" -y -ab 32 -ar 22050 -b 800000 -s 480*360 /"" + ExportName + "/""; //Flv格式        System.Diagnostics.Process p = new System.Diagnostics.Process();      p.StartInfo.FileName = ffmpegtool;      p.StartInfo.Arguments = Command;      p.StartInfo.WorkingDirectory = HttpContext.Current.Server.MapPath("~/tools/");      p.StartInfo.UseShellExecute = false;      p.StartInfo.RedirectStandardInput = true;      p.StartInfo.RedirectStandardOutput = true;      p.StartInfo.RedirectStandardError = true;      p.StartInfo.CreateNoWindow = false;      p.Start();      p.BeginErrorReadLine();      p.WaitForExit();      p.Close();      p.Dispose();      return true;    }    #endregion    #region 生成Flv视频的缩略图    /// <summary>    /// 生成Flv视频的缩略图    /// </summary>    /// <param name="vFileName">视频文件地址</param>    public string CatchImg(string vFileName)    {      if ((!System.IO.File.Exists(ffmpegtool)) || (!System.IO.File.Exists(HttpContext.Current.Server.MapPath(vFileName)))) return "";      try      {        string flv_img_p = vFileName.Substring(0, vFileName.Length - 4) + ".jpg";        string Command = " -i " + HttpContext.Current.Server.MapPath(vFileName) + " -y -f image2 -t 0.1 -s " + sizeOfImg + " " + HttpContext.Current.Server.MapPath(flv_img_p);        System.Diagnostics.Process p = new System.Diagnostics.Process();        p.StartInfo.FileName = ffmpegtool;        p.StartInfo.Arguments = Command;        p.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal;        try        {          p.Start();        }        catch        {          return "";        }        finally        {          p.Close();          p.Dispose();        }        System.Threading.Thread.Sleep(4000);        //注意:图片截取成功后,数据由内存缓存写到磁盘需要时间较长,大概在3,4秒甚至更长;        if (System.IO.File.Exists(HttpContext.Current.Server.MapPath(flv_img_p)))        {          return flv_img_p;        }        return "";      }      catch      {        return "";      }    }    #endregion    #region 运行FFMpeg的视频解码(绝对路径)    /// <summary>    /// 转换文件并保存在指定文件夹下    /// </summary>    /// <param name="fileName">上传视频文件的路径（原文件）</param>    /// <param name="playFile">转换后的文件的路径（网络播放文件）</param>    /// <param name="imgFile">从视频文件中抓取的图片路径</param>    /// <returns>成功:返回图片虚拟地址;失败:返回空字符串</returns>    public string ChangeFilePhy(string fileName, string playFile, string imgFile)    {      string ffmpeg = Server.MapPath(VideoConvert.ffmpegtool);      if ((!System.IO.File.Exists(ffmpeg)) || (!System.IO.File.Exists(fileName)))      {        return "";      }      string flv_file = System.IO.Path.ChangeExtension(playFile, ".flv");      string FlvImgSize = VideoConvert.sizeOfImg;      System.Diagnostics.ProcessStartInfo FilestartInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);      FilestartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;      FilestartInfo.Arguments = " -i " + fileName + " -ab 56 -ar 22050 -b 500 -r 15 -s " + widthOfFile + "x" + heightOfFile + " " + flv_file;      try      {        System.Diagnostics.Process.Start(FilestartInfo);//转换        CatchImg(fileName, imgFile); //截图      }      catch      {        return "";      }      return "";    }    public string CatchImg(string fileName, string imgFile)    {      string ffmpeg = Server.MapPath(VideoConvert.ffmpegtool);      string flv_img = imgFile + ".jpg";      string FlvImgSize = VideoConvert.sizeOfImg;      System.Diagnostics.ProcessStartInfo ImgstartInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);      ImgstartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;      ImgstartInfo.Arguments = "  -i  " + fileName + " -y -f image2  -ss 2 -vframes 1 -s  " + FlvImgSize + "  " + flv_img;      try      {        System.Diagnostics.Process.Start(ImgstartInfo);      }      catch      {        return "";      }      if (System.IO.File.Exists(flv_img))      {        return flv_img;      }      return "";    }    #endregion    #region 运行FFMpeg的视频解码(相对路径)    /// <summary>    /// 转换文件并保存在指定文件夹下    /// </summary>    /// <param name="fileName">上传视频文件的路径（原文件）</param>    /// <param name="playFile">转换后的文件的路径（网络播放文件）</param>    /// <param name="imgFile">从视频文件中抓取的图片路径</param>    /// <returns>成功:返回图片虚拟地址;失败:返回空字符串</returns>    public string ChangeFileVir(string fileName, string playFile, string imgFile)    {      string ffmpeg = Server.MapPath(VideoConvert.ffmpegtool);      if ((!System.IO.File.Exists(ffmpeg)) || (!System.IO.File.Exists(fileName)))      {        return "";      }      string flv_img = System.IO.Path.ChangeExtension(Server.MapPath(imgFile), ".jpg");      string flv_file = System.IO.Path.ChangeExtension(Server.MapPath(playFile), ".flv");      string FlvImgSize = VideoConvert.sizeOfImg;      System.Diagnostics.ProcessStartInfo ImgstartInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);      ImgstartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;      ImgstartInfo.Arguments = "  -i  " + fileName + "  -y  -f  image2  -t  0.001  -s  " + FlvImgSize + "  " + flv_img;      System.Diagnostics.ProcessStartInfo FilestartInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);      FilestartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;      FilestartInfo.Arguments = " -i " + fileName + " -ab 56 -ar 22050 -b 500 -r 15 -s " + widthOfFile + "x" + heightOfFile + " " + flv_file;      try      {        System.Diagnostics.Process.Start(FilestartInfo);        System.Diagnostics.Process.Start(ImgstartInfo);      }      catch      {        return "";      }      ///注意:图片截取成功后,数据由内存缓存写到磁盘需要时间较长,大概在3,4秒甚至更长;       ///这儿需要延时后再检测,我服务器延时8秒,即如果超过8秒图片仍不存在,认为截图失败;        if (System.IO.File.Exists(flv_img))      {        return flv_img;      }      return "";    }    #endregion    #region 运行mencoder的视频解码器转换(绝对路径)    /// <summary>    /// 运行mencoder的视频解码器转换    /// </summary>    public string MChangeFilePhy(string vFileName, string playFile, string imgFile)    {      string tool = Server.MapPath(VideoConvert.mencodertool);      if ((!System.IO.File.Exists(tool)) || (!System.IO.File.Exists(vFileName)))      {        return "";      }      string flv_file = System.IO.Path.ChangeExtension(playFile, ".flv");      string FlvImgSize = VideoConvert.sizeOfImg;      System.Diagnostics.ProcessStartInfo FilestartInfo = new System.Diagnostics.ProcessStartInfo(tool);      FilestartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;      FilestartInfo.Arguments = " " + vFileName + " -o " + flv_file + " -of lavf -lavfopts i_certify_that_my_video_stream_does_not_use_b_frames -oac mp3lame -lameopts abr:br=56 -ovc lavc -lavcopts vcodec=flv:vbitrate=200:mbd=2:mv0:trell:v4mv:cbp:last_pred=1:dia=-1:cmp=0:vb_strategy=1 -vf scale=" + widthOfFile + ":" + heightOfFile + " -ofps 12 -srate 22050";      try      {        System.Diagnostics.Process.Start(FilestartInfo);        CatchImg(flv_file, imgFile);      }      catch      {        return "";      }      return "";    }    #endregion  }}