C#实现通过ffmpeg从flv视频文件中截图的方法

using System;

using System.Configuration;

public class PublicMethod:System.Web.UI.Page

{

public PublicMethod()

{

}

//文件路径

public static string ffmpegtool = “ffmpeg/ffmpeg.exe”;

public static string mencodertool = “mencoder/mencoder.exe”;

public static string flvtool = “flvtool/flvtool2.exe”;//flv标记工具

public static string upFile = “UpFiles” + “/”;//上传文件夹

public static string imgFile = “ImgFile” + “/”;//图片文件夹

public static string playFile = “PlayFiles” + “/”;//flv文件夹

public static string xmlFile = “xmlFiles” + “/”;//xml文件夹

public static string sizeOfImg = “240×180”;//图片的宽与高

public static string widthOfFile = “400”;//flv文件的宽度

public static string heightOfFile = “350”;//flv文件的高度

//public static string ffmpegtool = ConfigurationManager.AppSettings[“ffmpeg”];

//public static string mencodertool = ConfigurationManager.AppSettings[“mencoder”];

//public static string upFile = ConfigurationManager.AppSettings[“upfile”] + “/”;

//public static string imgFile = ConfigurationManager.AppSettings[“imgfile”] + “/”;

//public static string playFile = ConfigurationManager.AppSettings[“playfile”] + “/”;

//文件图片大小

//public static string sizeOfImg = ConfigurationManager.AppSettings[“CatchFlvImgSize”];

//文件大小

//public static string widthOfFile = ConfigurationManager.AppSettings[“widthSize”];

//public static string heightOfFile = ConfigurationManager.AppSettings[“heightSize”];

//   // //获取文件的名字

private System.Timers.Timer myTimer = new System.Timers.Timer(3000);//记时器

public static string flvName = “”;

public static string imgName = “”;

public static string flvXml = “”;

public static int pId = 0;

public static string GetFileName(string fileName)

{

int i = fileName.LastIndexOf(“\”) + 1;

string Name = fileName.Substring(i);

return Name;

}

//获取文件扩展名

public static string GetExtension(string fileName)

{

int i = fileName.LastIndexOf(“.”)+1;

string Name = fileName.Substring(i);

return Name;

}

//

#region //运行FFMpeg的视频解码，(这里是绝对路径)

///

/// 转换文件并保存在指定文件夹下面(这里是绝对路径)

///

/// 上传视频文件的路径（原文件）

/// 转换后的文件的路径（网络播放文件）

/// 从视频文件中抓取的图片路径

/// 成功:返回图片虚拟地址;   失败:返回空字符串

public void ChangeFilePhy(string fileName, string playFile, string imgFile)

{

//取得ffmpeg.exe的路径,路径配置在Web.Config中,如:

string ffmpeg = Server.MapPath(PublicMethod.ffmpegtool);

if ((!System.IO.File.Exists(ffmpeg)) || (!System.IO.File.Exists(fileName)))

{

return;

}

//获得图片和(.flv)文件相对路径/最后存储到数据库的路径,如:/Web/User1/00001.jpg

string flv_file = System.IO.Path.ChangeExtension(playFile, “.flv”);

//截图的尺寸大小,配置在Web.Config中,如:

string FlvImgSize = PublicMethod.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;

//ImgstartInfo.Arguments = ”   -i   ” + fileName + ”   -y   -f   image2   -t   0.05   -s   ” + FlvImgSize + ”   ” + flv_img;

try

{

//转换

System.Diagnostics.Process.Start(FilestartInfo);

//截图

CatchImg(fileName, imgFile);

//System.Diagnostics.Process.Start(ImgstartInfo);

}

catch

{

}

}

#endregion

#region 截图

public string CatchImg(string fileName,string imgFile)

{

//

string ffmpeg = Server.MapPath(PublicMethod.ffmpegtool);

//

string flv_img =imgFile+”.jpg”;

//

string FlvImgSize = PublicMethod.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 “”;

}

//

catchFlvTool(fileName);

if (System.IO.File.Exists(flv_img))

{

return flv_img;

}

return “”;

}

#endregion

#region //运行FFMpeg的视频解码，(这里是(虚拟)相对路径)

///

/// 转换文件并保存在指定文件夹下面(这里是相对路径)

///

/// 上传视频文件的路径（原文件）

/// 转换后的文件的路径（网络播放文件）

/// 从视频文件中抓取的图片路径

/// 成功:返回图片虚拟地址;   失败:返回空字符串

public void ChangeFileVir(string fileName, string playFile, string imgFile)

{

//取得ffmpeg.exe的路径,路径配置在Web.Config中,如:

string ffmpeg = Server.MapPath(PublicMethod.ffmpegtool);

if ((!System.IO.File.Exists(ffmpeg)) || (!System.IO.File.Exists(fileName)))

{

return;

}

//获得图片和(.flv)文件相对路径/最后存储到数据库的路径,如:/Web/User1/00001.jpg

string flv_img = System.IO.Path.ChangeExtension(Server.MapPath(imgFile), “.jpg”);

string flv_file = System.IO.Path.ChangeExtension(Server.MapPath(playFile), “.flv”);

//截图的尺寸大小,配置在Web.Config中,如:

string FlvImgSize = PublicMethod.sizeOfImg;

System.Diagnostics.ProcessStartInfo FilestartInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);

FilestartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;

//此处组合成ffmpeg.exe文件需要的参数即可,此处命令在ffmpeg   0.4.9调试通过

//ffmpeg -i F:\01.wmv -ab 56 -ar 22050 -b 500 -r 15 -s 320×240 f:\test.flv

FilestartInfo.Arguments = ” -i ” + fileName + ” -ab 56 -ar 22050 -b 500 -r 15 -s ” + widthOfFile + “x” + heightOfFile + ” ” + flv_file;

try

{

System.Diagnostics.Process ps = new System.Diagnostics.Process();

ps.StartInfo = FilestartInfo;

ps.Start();

Session.Add(“ProcessID”, ps.Id);

Session.Add(“flv”, flv_file);

Session.Add(“img”, imgFile);

myTimer.Elapsed += new System.Timers.ElapsedEventHandler(myTimer_Test);

myTimer.Enabled = true;

}

catch

{

}

}

#endregion

#region //运行mencoder的视频解码器转换(这里是(绝对路径))

public void MChangeFilePhy(string vFileName, string playFile, string imgFile)

{

string tool = Server.MapPath(PublicMethod.mencodertool);

//string mplaytool = Server.MapPath(PublicMethod.ffmpegtool);

if ((!System.IO.File.Exists(tool)) || (!System.IO.File.Exists(vFileName)))

{

return;

}

string flv_file = System.IO.Path.ChangeExtension(playFile, “.flv”);

//截图的尺寸大小,配置在Web.Config中,如:

string FlvImgSize = PublicMethod.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 ps = new System.Diagnostics.Process();

ps.StartInfo = FilestartInfo;

ps.Start();

Session.Add(“ProcessID”, ps.Id);

Session.Add(“flv”, flv_file);

Session.Add(“img”, imgFile);

//pId = ps.Id;

//flvName = flv_file;

//imgName = imgFile;

myTimer.Elapsed += new System.Timers.ElapsedEventHandler(myTimer_Test);

myTimer.Enabled = true;

}

catch

{

}

}

///

/// 记时器功能，自动保存截图

///

///

///

private void myTimer_Test(object sender, System.Timers.ElapsedEventArgs e)

{

if (!object.Equals(null, Session[“ProcessID”]))

{

try

{

System.Diagnostics.Process prs = System.Diagnostics.Process.GetProcessById(int.Parse(Session[“ProcessID”].ToString()));

if (prs.HasExited)

{

CatchImg(Session[“flv”].ToString(), Session[“img”].ToString());

catchFlvTool(Session[“flv”].ToString());

myTimer.Enabled = false;

myTimer.Close();

myTimer.Dispose();

Session.Abandon();

}

}

catch

{

CatchImg(Session[“flv”].ToString(), Session[“img”].ToString());

catchFlvTool(Session[“flv”].ToString());

myTimer.Enabled = false;

myTimer.Close();

myTimer.Dispose();

Session.Abandon();

}

}

}

#endregion

public string catchFlvTool(string fileName)

{

//

string flvtools = Server.MapPath(PublicMethod.flvtool);

//

string flv_xml = fileName.Replace(“.flv”, “.xml”).Replace(PublicMethod.upFile.Replace(“/”, “”), PublicMethod.xmlFile.Replace(“/”, “”));

//

System.Diagnostics.ProcessStartInfo ImgstartInfo = new System.Diagnostics.ProcessStartInfo(flvtools);

ImgstartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;

//

ImgstartInfo.Arguments = ”   ” + fileName + ”   -UPx   ” + fileName + ”  >  ” + flv_xml;

try

{

System.Diagnostics.Process.Start(ImgstartInfo);

}

catch

{

return “”;

}

//

if (System.IO.File.Exists(flv_xml))

{

return flv_xml;

}

return “”;

}

}