Apple Compressor (4.1.2) - Manual (Page 78)

Chapter 5 Advanced tasks 78
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Dynamic Range: Controls a clip’s audio levels by enhancing the quieter parts and lowering
the louder parts. This is also referred to as audio level compression. The Dynamic Range effect
contains the following properties:
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Soften above: Drag the slider to set the level at which audio is reduced (softened) to the level
set by the “Master gain” control (described below). (You can also double-click the value and
type a new value.)
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Noise threshold: Drag the slider to set the level at which the effect is applied. (You can also
double-click the value and type a new value.) Audio at and above the noise threshold is
dynamically boosted to the level set by the “Master gain” control (described below), and
audio below the noise threshold is not modified.
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Master gain: Drag the slider to set the average level of the dynamically compressed audio.
(You can also double-click the value and type a new value.)
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Fade In/Out: Adds an audio fade-in effect at the beginning of the clip and a fade-out at the end
of the clip. The Fade In/Fade Out filter contains the following properties:
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Fade in duration: Enter a value in the text field or move the slider to set the length of the
fade in seconds.
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Fade out duration: Enter a value in the text field or move the slider to set the length of the
fade out in seconds.
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Fade in gain: Drag the slider to set the value between –100.0 (silence) and 0.0 (the audio’s
volume) to define the audio volume at which to start the fade in. (You can also double-click
the value and type a new value.)
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Fade out gain: Drag the slider to set the value between –100.0 (silence) and 0.0 (the audio’s
volume) to define the audio volume at which to start the fade out. (You can also double-
click the value and type a new value.)
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Peak Limiter: Sets the level of the loudest audio allowed in the clip. Drag the Gain slider to set
the level above which louder peaks are reduced. (You can also double-click the value and type
a new value.)
Add metadata
You can add metadata to your transcoded file in the form of job annotations and
closed-caption files.
Add annotations to a media file
Annotations are output with files transcoded using Apple Devices, MP3, and QuickTime settings.
You can annotate a source media file with information that is important for your workflow or
for the person viewing your output file. You can add any of the annotation fields provided in
Compressor, or import metadata that’s used in another media file (like a QuickTime movie).
1 In the batch area, select the job that contains the source file to which you want to add metadata.
Tip: To select the job, rather than an output row under the job, click the source filename at the
top of the job area.
2 In the Metadata area of the Job inspector, do one of the following:
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Choose an annotation type from the Add Job Annotation pop-up menu.
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Choose Import from the Add Job Annotation pop-up menu, select a media file that contains
annotations that you want to add to your source file, and then click Open.
3 Type a description in the text field (or in multiple text fields) for the annotation type you chose.
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