Apple Compressor (4.0) - Manual (Page 79)

Chapter 5 Custom settings and output formats 79
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Target System: Compressor limits available settings to those appropriate for the target system.
If you’re encoding for use with DVD Studio Pro, choose DVD Video. Choose DVD Audio only
if you’re encoding for use in a DVD Audio authoring application. To remove the setting limits,
choose Generic AC-3.
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Audio Coding Mode: Specifies the audio channels of the encoded stream. This setting also has
an Automatic button.
Audio Coding Mode
Automatic button
For example, “3/2 (L, C, R, Ls, Rs)” means three front channels (left, center, right), and two rear
channels (surround). “2/0 (L, R)” is essentially a standard stereo file. The audio coding mode
affects settings such as the available bandwidth and surround channel preprocessing. If you
click the Automatic button (next to the Audio Coding Mode pop-up menu), Compressor
makes its best guess at the intended audio coding mode, based on available source audio files.
3/1 channels 3/0 channels
2/2 channels 1/0 channels
(LFE option not available)
2/1 channels 2/0 channels
(LFE option not available)
3/2 channels
LFE
LFE LFE
LFE LFE
LFE
L C R
Ls Rs
L R
Ls Rs
L R L R
S
L C R
S
C
LFE
L C R
Note: In the Audio Coding Mode pop-up menu, “S” stands for a single rear surround channel,
and in this illustration, “LFE” stands for low-frequency effects (also known as the subwoofer). For
more information, see
Assign files to surround sound channels on page 74.
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Enable Low Frequency Effects: Select this checkbox to include the LFE channel in the encoded
stream (not available for 1/0 mono or 2/0 stereo).
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Sample Rate: Specifies the sample rate. All files intended for video and audio DVD authoring
must have a 48 kHz sample rate as required by the DVD specification. The 32 kHz and 44.1 kHz
sample rates are available only when Generic AC-3 is the target system.