Apple Compressor 3 Bedienungsanleitung PDF herunterladen (Seite 143)

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Preprocessing Tab Settings

Preprocessing options are applied to the audio data before encoding. With the exception

of the Compression Preset setting, leave these settings at their default values unless you

have a specific technical reason for changing them.

Compression Preset

• Compression Preset: Specifies one of the dynamic range processing modes built in to

the AC-3 format. The default of Film Standard Compression should only be used when

you are encoding an original mix intended for cinema. In almost all cases, you should

choose None.

Important: It is critical that you set the Audio tab’s Dialog Normalization correctly if

you intend to use any of these Compression Preset settings. The Compression Preset

settings assume that the audio, after the dialogue has been normalized, is at the normal

listening level of 31 dBFS. Levels that are consistently louder than that result in distorted

sound and erratic levels.

Note: If you are building a Dolby Digital Professional 5.1-channel surround sound DVD,

then you will use Film Standard Compression.

General

• Apply Digital Deemphasis: Specifies whether input audio data is preemphasized and

needs to be deemphasized before encoding.

143Chapter 10 Creating Dolby Digital Professional Output Files

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