做项目过程中有需求需要在上传视频的时候获取视频的封面，可以通过ffmpeg这个exe文件给上传的视频抽帧。具体代码如下：

string videoPath = Request.Form["videoPath"];string uploadPath = AppSettingUtil.AppSettings["UploadFilePath"];string videoFilePath = Server.MapPath("~/" + uploadPath + videoPath);string ffmpegPath = Server.MapPath(AppSettingUtil.AppSettings["ffmpeg"]);if (!File.Exists(ffmpegPath)) return new AjaxResult("ffmpeg不存在");string imagePath = DateTime.Now.ToString("yyyy") + "/" + DateTime.Now.ToString("MM") + "/" + DateTime.Now.Ticks + ".png";string imageSavePath = Server.MapPath("~/" + uploadPath + "" + imagePath);string cmd = string.Format("-i {0} -ss 00:00:01 -vframes 1 {1}", videoFilePath, imageSavePath);ProcessStartInfo startInfo = new ProcessStartInfo(ffmpegPath){ WindowStyle = ProcessWindowStyle.Hidden, Arguments = cmd};try{ Process proc = Process.Start(startInfo); if (proc != null) proc.WaitForExit();}catch (Exception ex){ return new AjaxResult(ex.Message);}if (File.Exists(imageSavePath)) return new AjaxResult { IsSuccess = true, Data = imagePath };return new AjaxResult("视频截图失败");

参考地址
ffmpeg 下载地址
Create a thumbnail image every X seconds of the video – FFmpeg