4.1.2

Chapter 4 Advanced adjustments 27
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Lo/Ro center, Lo/Ro surround, Lt/Rt center, Lt/Rt surround (for surround sound output): Use
these pop-up menus to set the decibel level at which the surround and center channels are
downmixed. Properties are enabled or disabled based on the channel layout you choose.
•
DRC line mode: Use this pop-up menu to set the dynamic range compression processing mode.
The default setting, Film Standard, is recommended for all use cases.
•
DRC RF mode: Use this pop-up menu to set the dynamic range compression processing mode
for RF (TV sets, cable set top boxes, or other devices that have RF connections).
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LFE low-pass lter: Select this checkbox to apply a 120 Hz low-pass lter to the low-frequency
eects (LFE) channel during output.
•
DC lter: Select this checkbox to apply a DC (direct current) high-pass lter to all input
channels. Although this lter provides a simple way to remove DC osets, note that most
mixed audio material is already free of DC osets.
•
Surround channels: 90 phase-shift: This property, which applies a 90-degree phase shift to the
surround channels, is selected by default. The shift in phase decorrelates the front and back
channels and prevents the L and Ls signals from canceling each other out if a surround-
compatible downmix is later applied to the decoded signal.
•
Surround channels: 3dB attenuation: Select this checkbox to apply a 3 dB cut to the surround
channels during output. This option is intended for multichannel output (like a lm
soundtrack) that is being transferred to a consumer home theater format. Cinema surround
channels are mixed 3 dB “hot” (higher) relative to the front channels to account for cinema
amplier gains.
•
Dialog normalization: Enter a value in the eld to set the loudness of the program in your
sound les relative to full modulation. The playback device uses this information to maintain
similar loudness among dierent AC-3 streams. The goal is to give all AC-3–encoded audio les
the same listening level, regardless of the source le.
Audio eects
For a list of available audio eects and instructions on how to add an audio eect to a setting,
see Add and remove eects on page 74.
H.264 for Apple Devices
The built-in Apple Devices settings use the H.264 for Apple Devices transcoding format. You can
also create custom settings that use the H.264 for Apple Devices transcoding format.
The properties of built-in and custom settings that use this transcoding format are located in the
General, Video, and Audio inspectors. These properties are described below.
Important: When you add a setting (or a destination that includes settings) to a job, Compressor
analyzes the source media and then automatically assigns the most appropriate setting
properties (based on the setting’s transcoding format and the characteristics of your source
media le). It’s recommended that you use the automatically assigned setting properties.
Setting summary
Displays the setting name and transcoding format, as well as an estimated output le size. When
you add a setting to a job or change the setting’s properties, this summary automatically updates.
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