通过ffmpeg从flv视频文件中截图代码,CSharp代码库,德仔网

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【CSharp】通过ffmpeg从flv视频文件中截图
作者:niuniu / 发布于2014/8/10/ 1018
C#通过ffmpeg从flv视频文件中截图的代码，需要先下载ffmpeg，开源的

	using System;
	using System.Configuration;
	
	public class PublicMethod:System.Web.UI.Page
	{
	 public PublicMethod()
	 {
	
	 }
	 //文件路径 ，http://www.sharejs.com
	 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 = "240x180"; //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)
	 /// <summary>
	 /// 转换文件并保存在指定文件夹下面(这里是绝对路径)
	 /// </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 void ChangeFilePhy(string fileName, string playFile, string imgFile)
	 {
	 //取得ffmpeg.exe的路径,路径配置在Web.Config中,如:<add key="ffmpeg" value="E:aspx1ffmpeg.exe" />
	 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:<add key="CatchFlvImgSize" value="240x180" />
	 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)
	 /// <summary>
	 /// 转换文件并保存在指定文件夹下面(这里是相对路径)
	 /// </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 void ChangeFileVir(string fileName, string playFile, string imgFile)
	 {
	 //取得ffmpeg.exe的路径,路径配置在Web.Config中,如:<add key="ffmpeg" value="E:\aspx1\ffmpeg.exe" />
	 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:<add key="CatchFlvImgSize" value="240x180" />
	 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 320x240 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:<add key="CatchFlvImgSize" value="240x180" />
	 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
	 {
	 }
	 }
	
	
	 /// <summary>
	 /// 记时器功能，自动保存截图
	 /// </summary>
	 /// <param name="sender"></param>
	 /// <param name="e"></param>
	 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 "";
	 }
	}
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　flv截图　　 flv　　截图　
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