Working with Subclips in Mixed-Frame-Rate Sequences
In cases where a subclip’s frame rate and a sequence’s frame rate do not match, adding
the subclip to the sequence may cause the subclip limits to be adjusted and new clip
In and Out points to be set. These adjustments ensure that the edit you perform has
the starting and ending frames you would expect.
You can verify that the subclip limits have been adjusted by comparing the following
Browser columns before and after you add a subclip to a sequence with a nonmatching
frame rate:
 Media Start
 Media End
 In
 Out
If any of these clip properties are adjusted when you perform an edit with a subclip,
Final Cut Pro displays a dialog to notify you.