Adobe Premiere Pro CS6 - Manual (Page 224)

You can perform a ripple or rolling edit either directly on the tracks in the Timeline.
About ripple and rolling edits
When you want to adjust the cut, or edit point, between two clips, use variations of simple trimming known as ripple edits and rolling edits. By
using specialized tools, make adjustments in a single action that would otherwise require multiple steps to accomplish. When you perform ripple
and rolling edits with trim tools, the affected frames appear in the Program Monitor side by side. In Premiere Pro CS6, more keyboard shortcuts are
available for ripple and rolling edits. Furthermore, the edit point is selected when you click it with a Ripple Edit or Rolling Edit tool.
Program Monitor and Timeline during a rolling edit
Rolling edit
A rolling edit trims an adjacent Out point and In point simultaneously and by the same number of frames. This action effectively moves the edit
point between clips, preserving other clips’ positions in time and maintaining the total duration of the sequence. Pressing Alt (Windows) or Option
(Mac OS) when you begin to perform a rolling edit overrides video and audio linking, allowing you to create a
split edit (L-cut or J-cut).
In this rolling edit, the edit point is moved earlier in time—shortening the previous clip, lengthening the next clip, and maintaining the program
duration.
Ripple edit
A ripple edit trims a clip and shifts subsequent clips in the track by the amount you trim. Shortening a clip by ripple editing shifts all clips after the
cut back in time; conversely, extending a clip shifts the clips that follow the cut forward in time. When you’re making a ripple edit, empty space on
one side of the cut is treated as a clip and shifts in time just as a clip would be. Pressing Alt (Windows) or Option (Mac OS) when you begin to
perform a ripple edit ignores the link between video and audio.
Make a rolling edit using the Rolling Edit tool
1. Select the Rolling Edit tool .
2. In a Timeline panel, drag left or right from the edge of the clip you want to change. The same number of frames added to the clip are
trimmed from the adjacent clip. Alt-drag (Windows) or Option-drag (Mac OS) to affect only the video or audio portion of a linked clip.
Timeline panel during (above) and after (below) a roll edit
Make rolling edits (extend edits) with the playhead
You can move the In point or Out point of a clip in a sequence to the playhead, without leaving gaps in the sequence. This type of editing is
sometimes called extending an edit, or using extend edit commands.
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