MediaCentral | UX User’s Guide : Using the Sequence Pane : Editing a Sequence : Trimming Segments in the Timeline : Using Double-Sided Trim

Using Double-Sided Trim
 
Double-sided trim refers to a trimming operation in which one video segment is extended into another video segment and overwrites the material in the trimmed segment. (This feature is referred to as dual-roller trim in Media Composer and NewsCutter.) The combined duration of both clips remains the same.
In a basic sequence, double-sided trim applies to video and to the synced audio track.
In an advanced sequence, double-sided trim applies to video only.
To use double-sided trim:
*Hold down the Control key (Windows) or the Command key (Macintosh) and drag the transition.
Trim indicators appear on both sides of the transition while you hold down the Control key.
You can use the following keystrokes to control the trim:
 
Shift+M
Trim the segment’s selected end by 10 frames earlier.
Shift+ comma (,)
Trim the segment’s selected end one frame earlier.
Shift+period (.)
Trim the segment’s selected end one frame later.
Shift+slash (/)
Trim the segment’s selected end 10 frames later.
*This keyboard shortcut is designed for an American keyboard; it may not work with another keyboard layout.