User Manual

Understanding Sync Breaks
572
Match frames (left) and sync breaks (right) in the Timeline
You encounter sync breaks and match frames in different circumstances:
• You can encounter sync breaks in one or several video tracks, audio tracks, data track, or all.
Sync-break offset numbers appear by default only in the affected tracks.
• You encounter match-frame cuts whenever you perform an add edit or whenever you move a
segment next to footage from the same clip and the timecode is continuous across the edit.
You can customize the Timeline view to display sync breaks and match-frame edits in video
tracks only, audio tracks only, or neither. For more information, see “Fixing Sync Breaks” on
page 573.
n
The Sync Breaks feature applies only to master clips in which audio and video tracks were
captured simultaneously, to autosynced subclips, or to any other subclip with video and audio
tracks.
Tips for Avoiding Sync Breaks
One way to avoid breaking sync is to maintain the duration of the track when you add or remove
material. The following table provides tips on how to do this in different circumstances:
Task Tips
Add material
to a track
Use the Overwrite or Replace functions instead of Splice-in.
For more information on overwrite and replace editing, see “Performing an
Overwrite Edit” on page 549 and “Performing a Replace Edit” on page 550.
Remove material
from a track
Use Lift instead of Extract. (The Lift function leaves filler of the same duration
when you remove footage.)
For more information, see “Lifting, Extracting, and Copying Material” on
page 566.
Perform Segment
edits
Use the Lift/Overwrite function instead of Extract/Splice-in. (Lift/Overwrite
leaves filler behind and overwrites material at the new destination, maintaining
sync in both cases.)
For more information, see “Working with Segments” on page 650.