Apple Soundtrack Pro - Manual (Page 80)

80 Chapter 3 Getting Started With Soundtrack Pro
Video Out Preferences
These preferences let you specify settings for video output from Soundtrack Pro.
 Video Output Device pop-up menu: Choose a video output device, or choose None.
 Use Quarter-size Frames checkbox: Select to send video to the output device as
quarter-size frames. Quarter-size frames require less data throughput and can be sent
more efficiently than full-size frames.