A key indicating the chapter start time in the dictionaries that are array elements in the array returned by QTMoviechapters or passed to QTMovieaddChapters:withAttributes:error.
Available in Mac OS X v10.5 and later.
Declaration Syntax Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)