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.75271.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 ""; } }