Apple Motion 5.1.1 - Manual (Page 1022)

Chapter 23 Audio 1022
Because Level and Pan curves each use a different scale, it can be difficult to frame them at the
same time in the Keyframe Editor.
To edit, add, or remove keyframes for animated Level and Pan settings, use the Audio Timeline
or Keyframe Editor. For more information on working with the Keyframe Editor, see
Keyframing
overview on page 439. For more information on editing keyframes in the Audio Timeline, see
Display and modify keyframes in the Timeline on page 279.
Turn on or off the display of keyframes in the Audio Timeline
m Click the Show/Hide Keyframes button in the upper-left corner of the track area.
Crossfade audio tracks
In the Keyframe Editor, you can view the audio tracks in your project, along with the Level and
Pan curves for each track.
To create a crossfade, add keyframes to the level curve of each track at the same (or nearly the
same) points where you want the crossfade to start and end. Listen to the crossfade as you work.
You may find that the best-sounding results are achieved by having the level curves for the two
tracks be slightly asymmetrical. This is because the perceived loudness of different sounds with
the same numerical value can be different.
Sync audio and video tracks
Motion lets you determine how to handle the playback of audio if the audio tracks are not
in sync with the video. You can skip video frames to resync with the audio, or to pause audio
playback to avoid skipping frames if the video is out of sync.
Set audio sync preferences
1 Choose Motion > Preferences, then open the Time pane.
2 In the Playback Control section, select “Skip video frames” or “Pause audio playback.”
•
If you select “Pause audio playback,” audio playback pauses when video and audio are out
of sync, then begins when audio catches up on the next loop. This enables an uninterrupted
flow of video frames (at the expense of playback slowing down) to evaluate the look of
your composition.
•
If you select “Skip video frames,” video frames are dropped to enable an uninterrupted flow of
audio, for as close to real-time playback as possible.
Retime audio
Retime audio overview
Motion lets you retime audio clips or channels to speed them up, slow them down, or play them
at a different speed. There are several ways to retime audio clips:
•
Adjust the Timing controls in the Properties Inspector to modify the clip’s playback speed, In
and Out points, duration, and end condition (whether it it stops, loops, or “ping-pongs” back
and forth).
•
Adjust the green bar in the Audio Timeline to modify the clip’s duration, playback speed and
to set whether or not the clip loops.
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