Creating Reference Movies to Optimize Web Playback
You can use reference movies to provide the appropriate movie for different users’
connection speeds. For example, you can have a smaller movie streamed to users
connected over a standard modem, and a larger version of the movie streamed to
users connected over a broadband connection.
Apple provides a free tool, MakeRefMovie X, that greatly simplifies the process of
creating reference movies. You can download this software at:
developer.apple.com/quicktime/quicktimeintro/tools/