视频管理模块代码总结 （1）对上传的flash截取视频并自动生成图

项目中需要做一个简单的视频管理功能。

需要能上传视频，并能对上传完成的视频自动截取。

?（1）自动截取视频并生成图片的代码如下：

?/// <summary>
??????? /// 根据上传flv生成图片,并返回图片路径
??????? /// </summary>
??????? /// <param name="vFileName"></param>
??????? /// <returns></returns>
??????? private string CatchImg(string vFileName)
??????? {
??????????? string srcFileName = vFileName;
??????????? //取得ffmpeg.exe的路径,路径配置在Web.Config中,如:<add?? key="ffmpeg"?? value="E:51aspxffmpeg.exe"?? />? ?
??????????? //string?? ffmpeg=System.Configuration.ConfigurationSettings.AppSettings["ffmpeg"];? ?
??????????? string ffmpeg = Server.MapPath("ffmpegffmpeg.exe").Replace("VideoShare","");
??????????? vFileName = Server.MapPath(vFileName).Replace("VideoShare","");
??????????? if ((!System.IO.File.Exists(ffmpeg)) || (!System.IO.File.Exists(vFileName)))
??????????? {
??????????????? return "";
??????????? }

??????????? //获得图片相对路径/最后存储到数据库的路径,如:/Web/User1/00001.jpg
??????????? string srcImageName = System.IO.Path.ChangeExtension(srcFileName,".jpg");
??????????? string flv_img_p = System.IO.Path.ChangeExtension(vFileName,".jpg");
??????????? flv_img_p = flv_img_p.Replace("videos","images");

??????????? //图片绝对路径,如:D:VideoWebFlvFileUser1001.jpg? ?
??????????? //string flv_img_p = HttpContext.Current.Server.MapPath(flv_img);

??????????? //截图的尺寸大小,配置在Web.Config中,如:<add?? key="CatchFlvImgSize"?? value="240x180"?? />? ?
??????????? //string?? FlvImgSize=System.Configuration.ConfigurationSettings.AppSettings["CatchFlvImgSize"]; ?
??????????? string FlvImgSize = "240x180";

??????????? System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);
??????????? startInfo.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? ?
??????????? startInfo.Arguments = "?? -i?? " + vFileName + "?? -y?? -f?? image2? -ss?? 8? -t?? 0.001?? -s?? " + FlvImgSize + "?? " + flv_img_p;
??????????? try
??????????? {
??????????????? System.Diagnostics.Process.Start(startInfo);
??????????? }
??????????? catch
??????????? {
??????????????? return "";
??????????? }
??????????? 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;? ?
??????????? ///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;? ?
??????????? ///此处略去延时代码.如有那位知道如何捕捉ffmpeg.exe截图失败消息,请告知,先谢过!? ?
??????????? if (System.IO.File.Exists(flv_img_p))
??????????? {
??????????????? return "../" + srcImageName.Replace("videos","images");
??????????? }

??????????? return "";
??????? }

这里另需要下载一个ffmpeg.exe的程序。如需要可通过邮箱或QQ发送