Track Number

• Specify the number of audio track which you decide to extract.
  By selecting the track number when Preview the video, the format of each track is shown on Information Window.

Output Method

• Demux rips out the specific track (AC3, MPA, DTS)
  Demux All Tracks rips out all raw streams (AC3, MPA, DTS) inside the program stream.
  Decode decodes the specific AC3 stream or demux the specific LPCM track to the WAV file.

Dolby Digital Decode

• Dynamic Range Control and Dolby Surround affect the result of Decode.

• The optimal option of Dynamic Range Control mainly depends on the nature of source and audio-visual environment.
  In my opinion, it's better to select Normal for movie titles and Off for music titles.
  Sometimes there is no difference since the manufacturer prefers full dynamic range and doesn't provide DRC.

• Normal is similiar to 'Line out mode' and Heavy is similiar to 'RF-remod mode' of Sonic Foundary Soft Encode.
  It seems the WinDVD directshow filter (iviaudio.ax) invokes Heavy DRC also. However, Heavy is NOT recommended
  because it usually results in obvious volume transitions, especially for music titles.

• DRC averages the volume (dynamic range compression) and Normalization is still necessary after DRC.

• The difference between Conventional Stereo and Dolby Surround Downmix

  Conventional Stereo (5.1->2ch)

  Lo = L + c' * C + s' * Ls (+ lfe' * LFE)
  Ro = R + c' * C + s' * Rs (+ lfe' * LFE)

  Dolby Surround Downmix (5.1->2ch)

  Ls + Rs -> 7KHz low-pass filter (in order to obey the DS spec) -> S

  Lt = L + c" * C - s" * S (+ lfe" * LFE)
  Rt = R + c" * C + s" * S (+ lfe" * LFE)

  Lt, Rt -> Pro-Logic rematrixing (inverse computation) -> L, R, C, S (2->4ch)

• Pre-Scale Decision is designed to reduce the quantization error of Dolby Digital decoding.
  Specify the Track Number and set the value of Normalization at first then start Pre-Scale Decision.
  It will take a while to decode and compute the pre-scale ratio by peak value.
  This ratio is shown by Info value of Information Window and applied to later decoding.

48 -> 44.1KHz

• DVD2AVI implants the downsampling algorithm from WAVEFS44.
  The difference is that DVD2AVI preserves the gain=1 and invokes overflow clipping.

• Although this conversion takes a lot of time, the quality is excellent compared with other softwares.
  Mid provides the acceptable quality in many cases.
  UltraHigh is designed for those who pursue for the best.

Normalization

• Normalization modifies the volume to a certain degree.
  The optimal value depends on your applications.
  For example, I usually choose 100 for PC headphone (MPEG-4) and 70 for TV display (VCD)