How to set Screencapture audio profile bitrate at runtime

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C#

How can set screen capture audio profile bit-rate for clear recording audio and video.

job.Duration = TimeSpan.FromMilliseconds(durationMillis);

                    ie = new InternetExplorer();
                    ie.Navigate(url, ref Empty, ref Empty, ref Empty, ref Empty);
                    ie.FullScreen = true;
                    ie.Visible = true;
                    System.Threading.Thread.Sleep(1000);

                    job.ScreenCaptureVideoProfile.FrameRate = fps;

                    job.ScreenCaptureAudioProfile.Bitrate = new ConstantBitrate(20);

This code through exception " Audio capture bitrate is not supported by screen capture. Supported bitrate for current format are: 48 Kbps, 63 Kbps, 64 Kbps, 80 Kbps, 95 Kbps, 96 Kbps, 127 Kbps, 128 Kbps, 160 Kbps, 191 Kbps, 192 Kbps, 256 Kbps
"
Please suggest me how i can handle this.