Using subtitles and alternative audio tracks
Some videos feature subtitles, closed captioning, and alternative audio tracks (in other languages, for example).
Here are ways to use subtitles and audio tracks:
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To change the default language used for subtitles and audio, choose iTunes > Preferences, click Playback, and choose a language from the Audio Language and Subtitle Language pop-up menus. 
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To turn closed captioning on or off, choose iTunes > Preferences, click Playback, and select “Show closed captioning when available.†
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While you’re playing a movie in iTunes, to change settings, choose Controls > Audio & Subtitles > [Option]. 
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While a movie is playing, to quickly turn subtitles on or off, move the pointer over the movie until the controls appear, and then click the Subtitles button. 
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