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
 }
}