4.1

Chapter 5 Advanced tasks 68
The channel codes describe the location of the channel:
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L: Left front channel
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R: Right front channel
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C: Center front channel
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Ls: Left surround channel
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Rs: Right surround channel
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Cs: Center surround channel
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LFE: Low-frequency eects channel (subwoofer, LFE)
Note: It’s important to understand that Compressor cannot convert stereo audio les into 5.1
surround sound channels. If you want to output a 5.1 surround sound audio le, you must rst
create the six channels of audio required and then import those surround sound les into
Compressor. Then you can use Compressor to output the surround sound source media le. For
more information, see Import and modify surround sound les on page 64.
After you import a surround sound source le, you can transcode that le into any of the channel
layouts above.
Compressor analyzes audio les during import to determine the source le’s channels. When
you apply a transcode setting to the source le, Compressor automatically adjusts the channel
layout of the setting to provide logical results. For many settings, you can choose Automatic from
the “Channel layout” pop-up menu (in the Audio inspector) to have Compressor determine the
logical channel layout based on the source le.
Compressor also maps channels intelligently during output. For example:
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If you assign a mono channel layout to a stereo source le: The output le will be
automatically downmixed.
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If you assign a surround channel layout to a stereo source le: The output le will have only left
and right channels—mapped to the left front (L) and right front (R) channels of the source
le—while the other channels are unassigned.
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If you assign a left front or left rear surround channel to a stereo source le: Compressor maps the
source le to the left channel (and ignores the right channel).
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