C#视频转换类分享

本文实例为大家分享了c#视频转换类的具体代码，供大家参考，具体内容如下

videoconvert

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
 }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。