Apple Motion 3 - Manual (Page 1136)

1136 Chapter 13 Working with Audio
Syncing 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 choose to skip video frames in order to re-sync with
the audio, or to pause audio playback to avoid skipping frames if the video is out of
sync.
To set audio sync preferences:
1 Choose Motion > Preferences, then click the button for the Project pane.
2 In the Playback Control section of the Project pane, click the “Skip video frames” button
to skip frames, or click the “Pause audio playback” button to pause audio playback.
When you select “Pause audio playback,” audio playback pauses when video and audio
are out of sync, then begins playing when it catches up on the next loop.
Retiming Audio
Motion allows you to retime audio clips or individual channels to speed them up, slow
them down, or play them back at a different speed. All of the controls below can apply
either to a stereo audio clip, or individual channels.
Note: When retiming video, audio attached to the footage is automatically retimed
along with it. You can unlink video and audio to retime them separately. For more
information on retiming footage, see “
Retiming ” on page 312.
Timing Controls in the Inspector
Each audio object has individual timing parameters in the Properties tab.
Speed: Sets the speed of the audio clip as a percentage. The default is 100%. Values
lower than 100 play back the audio clip more slowly than its original speed, and also
extend the Duration of the audio clip. Values higher than 100 play back the audio clip
faster than its original speed, and shorten the Duration of the audio clip.
In: Sets the In point of the audio clip. Adjusting this parameter always moves the audio
clip In point to the specified frame without affecting its duration.
Out: Sets the Out point of the audio clip. Adjusting this parameter always moves the
audio clip Out point to the specified frame without affecting its duration.
Duration: Sets the total duration of the audio clip. Adjusting Duration will also affect
the Speed and the Out point.
End Condition: Sets how playback continues when the end of the audio clip is
reached.
 None: The default setting. The audio clip’s duration in your project is equal to the
duration of its source media file.