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("\") + 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
  }
}

希望本文所述对大家的C#程序设计有所帮助。