Apple's iMovie is more versatile in it's subtitling options, although still not perfect. When working with iMovie, you have the limitation of titles appearing in overlay on the video. iMovie supports two subtitle options, not counting the Stripe Subtitle, which is more like the marquee you see appearing at the bottom of a screen to identify the current person speaking. Option one is a two line subtitle for adding text detail on a per clip basis. A more versatile option for adding subtitles to a dialog intensive movie is the Subtitle Multiple Option.
With the Titles button selected in your workspace, expand Subtitle in the titles menu and choose Subtitle Multiple. Type in your title information and click the plus (+) button until you get all of the subtitles added for the clip.
By default iMovie uses television margins for positioning the subtitles, which means the text is bumped up higher in the picture to prevent cutting it off on your screen. If your movie is for the online distribution, check the box next to QT Margins to neatly adjust the subtitles closer to the bottom of the frame. If you have a light colored background, be sure to change the text color from the default white to something easily readable.
