Adobe Premiere Pro CS3 Manual de usuario Pagina 214

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ADOBE PREMIERE PRO CS3
User Guide
208
Specify the automated keyframe creation
Automating audio changes in the Audio Mixer can create more keyframes than necessary in the audio track,
degrading performance. To avoid creating unnecessary keyframes, thereby ensuring both quality interpretation and
minimal performance degradation, set the Automation Keyframe Optimization preference. In addition to
providing other benefits, this preference makes editing individual keyframes easier because they are less densely
arranged on the keyframe graph.
1 Choose Edit > Preferences > Audio (Windows) or Premiere Pro > Preferences > Audio (Mac OS).
2 In the Automation Keyframe Optimizations area, select one or both of the following options, and then click OK:
Linear Keyframe Thinning Creates keyframes only at points that don’t have a linear relationship to the start and end
keyframes. For example, suppose you are automating a fade from 0 dB to –12 dB. With this option selected, Adobe
Premiere Pro creates keyframes only at the points that represent an increase in value from the beginning (0 dB) and
ending (–12 dB) keyframes. If you don’t select this option, Adobe Premiere Pro may create several incremental
keyframes of identical values between those two points, depending on the speed at which you change the value. This
option is selected by default.
Minimal Time Interval Thinning Creates keyframes only at intervals larger than the value you specify. Enter a value
between 1 and 2000 milliseconds.
Panning and balancing
About panning and balancing
By default, all audio tracks output to the sequence’s master audio track. Because tracks may contain different
numbers of channels than the master (depending on whether they are mono, stereo, or 5.1 surround tracks), it’s
necessary to control what happens when a track outputs to another track containing a different number of channels.
Panning is the moving of audio from one channel to another. You can use panning to position an audio channel
within a multichannel track. For example, if a car drives by on the right side of a video frame, you can pan the
channel with the car’s audio so that you hear it on the right side of the multichannel audio field.
Balancing redistributes multichannel audio track channels among the channels of another multichannel track.
Balancing is distinct from panning in that spatial information is already encoded in multiple channels. Balancing
simply alters their relative proportions.
Note: If necessary, you can balance a clip by applying the Balance audio effect. Do so only after you determine that
track balancing isn’t sufficient.
The relation between the number of channels in an audio track and the number of channels in the output track
(often the master track) determines whether the pan and balance options are available for an audio track. In the
Audio Mixer, the number of level meters in a track indicates the number of channels for that track with the output
track displayed in the Track Output Assignment pop-up menu at the bottom of each track. The following rules
determine whether a track’s audio can be panned or balanced in its output track:
When you output a mono track to a stereo or 5.1 surround track, you can pan it.
When you output a stereo track to a stereo or 5.1 surround track, you can balance it.
When the output track contains fewer channels than in the other audio tracks, Adobe Premiere Pro downmixes
the audio to the number of channels in the output track.
April 1, 2008
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