C#视频转换类分享

using System.Web;using System.Configuration;namespace DotNet.Utilities{ 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 }}