Apple Final Cut Pro 7 - Manual (Page 477)

Things to Keep in Mind When Setting an Out Point
When you want to mark the duration of a clip in a sequence, you need to remember to
set the Out point one frame earlier than you might expect, or you may also include the
first frame of the next clip. This often happens when you have snapping turned on and
you snap to clip start and end points to set In and Out points.
The Out point includes
the first frame of the
adjacent clip.
For example, if a clip in the Timeline is a shot of a playground and the next clip is a shot
of a classroom, when you move the playhead to snap to the end of the playground clip,
you see the first frame of the classroom clip in the Canvas. If you then set an Out point
and copy and paste the playground clip, you see one classroom frame at the end of the
pasted content. You probably didn’t intend to include the first frame of the classroom
shot, but it was included because of the Out point inclusive rule.
To avoid accidentally selecting the first frame of the next clip
Do one of the following:
µ
Use the Mark > Mark Clip feature (described in “Setting In and Out Points to Match a Clip
or Gap” ) to place In and Out points directly on the first and last frames of the clip.
477 Chapter 33 Setting Edit Points for Clips and Sequences