使用ffmpeg截取视频第一帧当做背景图

/// <summary>
        /// 从视频画面中截取一帧画面为图片
        /// </summary>
        /// <param name="videoName">视频文件路径pic/123.MP4</param>
        /// <param name="widthAndHeight">图片的尺寸如:240*180</param>
        /// <param name="cutTimeFrame">开始截取的时间如:"1s"</param>
        /// <returns>返回图片保存路径</returns>
        public static string GetPicFromVideo(string videoName, string widthAndHeight, string cutTimeFrame)
        {
            var vdoName = videoName.Substring(videoName.LastIndexOf("/") + 1);
            var fileName = vdoName.Split(‘.‘)[0];
            var dtime = DateTime.Now.ToString("yyyy-MM-dd");
            var basePath = System.Web.HttpContext.Current.Server.MapPath("~");
            var ImgPath = basePath + "upload\\Images\\" + dtime;
            //ffmpeg.exe路径
            var ffmpeg = basePath + "bin\\ffmpeg.exe";
            var srcName = basePath + videoName.Replace("/", "\\");
            
            if (!Directory.Exists(ImgPath))
            {
                Directory.CreateDirectory(ImgPath);
            }
            //保存截取图片后路径
            var objName = " "+ ImgPath + "\\"+  fileName + ".jpg";
            var startInfo = new ProcessStartInfo(ffmpeg);
            startInfo.WindowStyle = ProcessWindowStyle.Hidden;
            startInfo.Arguments = " -i " + srcName + " -y -f image2 -ss " + cutTimeFrame + " -t 0.001 -s " + widthAndHeight + " " + objName;
            //startInfo.UseShellExecute = false;
            //startInfo.CreateNoWindow = true;
            try
            {
                Process.Start(startInfo);
                //返回图片保存路径
                return "/upload/Images/" + dtime+"/" + fileName + ".jpg";
            }
            catch (Exception re)
            {
                //Log.WriteLog(re.Message);
                return "";
            }
        }

var  gb_img_scr = PicFromVideo.GetPicFromVideo(src, "160*300", "1");