使用Microsoft Expression Encoder连续录制5分钟（x分钟）的视频

Question

我的软件将连续录制5分钟的视频。 示例：软件应在程序启动时开始录制，并在缓冲区中连续保持5分钟的视频。当我停止录制时，录制的最后5分钟应保存到磁盘

private void CaptureMoni()
        {

            try
            {
                Rectangle _screenRectangle = Screen.PrimaryScreen.Bounds;
                _screenCaptureJob = new ScreenCaptureJob();
                _screenCaptureJob.CaptureRectangle = _screenRectangle;
                _screenCaptureJob.ShowFlashingBoundary = true;
                _screenCaptureJob.ScreenCaptureVideoProfile.FrameRate = 20;
                _screenCaptureJob.CaptureMouseCursor = true;

                _screenCaptureJob.OutputScreenCaptureFileName = string.Format(@"C:\test.wmv");
                if (File.Exists(_screenCaptureJob.OutputScreenCaptureFileName))
                {
                    File.Delete(_screenCaptureJob.OutputScreenCaptureFileName);
                }
                _screenCaptureJob.Start();
            }
            catch(Exception e) { }
        }

类似的东西：

private void SaveRecord(int cntMinutes)
        {

            try
            {
                _screenCaptureJob.Stop();
                // something like that
                _screenCaptureJob.SaveLastXMinutes(cntMinutes);
            }
            catch(Exception e) { }
        }