5

Locking Timeline Tracks
Occasionally, you might want to prevent changes to an item. The lock icon at the right
edge of the Timeline layers list allows you to lock an object and prevent any changes
from affecting that object. An object that is locked in the Timeline also appears locked
in the Layers list in the Project pane.
Hash marks indicate
track is locked.
Lock icon
When an item is locked, the colored bar in the track area appears with a hash-mark pattern.
Locked tracks still appear in the Canvas and are included in your final output. Although
you cannot make changes to a locked object, you can still copy or duplicate that object
or change the object’s layer order.
To lock a track
µ
Click the lock icon at the right edge of the Timeline layers list.
Audio-Video Links
Ordinarily, objects that contain both audio and video are linked so they remain in sync.
This link is represented by an icon in the Timeline layers list.
Link icons
Note: To display the Audio Timeline, click the Show/Hide Audio Timeline button, located
in the lower-right corner of the Motion project window.
Objects that are linked are always edited together in the Timeline. Operations such as
cut, copy, paste, and split affect both audio and video. However, if you ever want to break
that relationship so you can move or edit the audio or video without the other tagging
along, you can disable that link and move either object freely. Beware that this might
result in your audio and video playing out of sync.
To manipulate audio and video elements separately
1 Click the link icon to the right of the object name for the video or audio element.
324 Chapter 8 Using the Timeline