If the video / movie files you want to view are in a format that is not supported by iTunes, you may be able to convert them into a compatible format with Video Converter Pro for Mac.

iTunes is a proprietary digital media player application, used for playing and organizing digital music and video files. The program is also an interface to manage the contents on Apple's popular iPod digital media players as well as the iPhone. Additionally, iTunes can connect to the iTunes Store via the Internet to purchase and download music, music videos, television shows, applications, iPod games, audiobooks, podcasts, feature length films and movie rentals (not available in all countries), and ringtones (available only in the USA). It is also used to download applications for the iPhone and iPod touch as long as they are running iPhone OS 2.0 or later.
iTunes was introduced by Apple Inc. on January 9, 2001, at the Macworld Expo in San Francisco. The latest version, iTunes 8, was announced at Apple's September 2008 keynote "Let's Rock".
iTunes is available as a free download for Mac OS X, Windows Vista, and Windows XP from Apple's website. It is also bundled with all Macs, and some HP and Dell computers. Older versions are available for Mac OS 9, OS X 10.0-10.3, and Windows 2000.
iTunes is an application that allows the user to manage audio and video on a personal computer, acting as a front end for Apple's QuickTime media player. Officially, using iTunes is required in order to manage the audio of an Apple iPod portable audio player, although alternative software does exist. Users can organize their music into playlists within one or more libraries, edit file information, record Compact Discs, copy files to a digital audio player, purchase music and videos through its built-in music store, download free podcasts, back up songs onto a CD or DVD, run a visualizer to display graphical effects in time to the music, and encode music into a number of different audio formats. There is also a large selection of free internet radio stations to listen to.
Additionally, users can add PDF files to their library (to add digital liner notes to their albums, for example), but the PDFs cannot be transferred to or read on an iPhone or iPod. However, iPhone/iPod Touch apps exist to sync any type of file to and from the device to an "iDisk" using Apple's MobileMe service.
In iTunes 8.0, the preferences menu was given a complete makeover. The result added very few new options, but instead removed several options. For example, iTunes once gave users the option to display arrows beside the selected song's title, artist, album, and genre that link directly to the iTunes Store. Now these arrows are not removable, except through the direct editing of a preferences file.
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