[.NET]c#.net程序中使用ffmpeg.exe来处理视频并生成上传视频的截图

添加如下前台代码：

<asp:FileUpload ID="FileUpload1" runat="server" />

<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传视频" />

.cs中代码：

protected void Button1_Click(object sender, EventArgs e) //按钮事件

{

string imgfileExp = this.FileUpload1.PostedFile.FileName.Substring (this.FileUpload1.PostedFile.FileName.LastIndexOf(".") + 1);

string filename = "11223344";

if (imgfileExp.ToLower() == "flv")

{

this.FileUpload1.PostedFile.SaveAs(Server.MapPath("~/uploadfile") + "\\" + filename + "." + imgfileExp);

string ffmpeg = Server.MapPath("ffmpeg.exe"); //ffmpeg执行文件的路径

string filenames = Server.MapPath("uploadfile") + "\\" + filename + "." + imgfileExp; //上传文件存放路径

string catchImg = CatchImg("uploadfile/" + filename + "." + imgfileExp);

}

}

public string CatchImg(string vFileName)

{

try

{

string ffmpeg = "ffmpeg.exe";

ffmpeg = Server.MapPath(ffmpeg);

if ((!System.IO.File.Exists(ffmpeg)) || (!System.IO.File.Exists(System.Web.HttpContext.Current.Server.MapPath(vFileName))))

{

return "";

}

//获得图片相对路径/最后存储到数据库的路径,如:uploadfile/11223344.jpg

string flv_img = System.IO.Path.ChangeExtension(vFileName, ".jpg");

//图片绝对路径,如:D:\Video\Web\FlvFile\User1\0001.jpg

string flv_img_p = Server.MapPath("uploadfile/1.jpg");

//截图的尺寸大小,配置在Web.Config中,如:<add key="CatchFlvImgSize" value="140x110" />

string FlvImgSize = "140*110";

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 " + Server.MapPath(vFileName) + " -y -f image2 -t 0.1 -s " + FlvImgSize + " " + flv_img_p;

try

{

System.Diagnostics.Process.Start(startInfo);

}

catch

{

return "";

}

System.Threading.Thread.Sleep(4000);

return "";

}

catch

{

return "";

}

}

注意:1、startInfo.Arguments中的3个字符串参数中不能出现空格，否则生成图片失败。
2、在web.config中的 <system.web>里添加 <httpRuntime maxRequestLength="2097151" executionTimeout="60"/>.
3、需要下载的东西有ffmpeg.exe和pthreadGC2.dll.