C#调用mmpeg进行各种视频转换的类实例

本文实例讲述了C#调用mmpeg进行各种视频转换的类。分享给大家供大家参考。具体如下：

这个C#类封装了视频转换所需的各种方法，基本上是围绕着如何通过mmpeg工具来进行视频转换

 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("\\") + ;
       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(".") + ;
       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(, vFileName.Length - ) + ".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();
         //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
   }
 }

希望本文所述对大家的C#程序设计有所帮助。