To resolve this issue, upgrade to iOS 5 or later and iMovie for iOS 1.2.2 or later. iMovie for iOS 1.2.2 includes expanded support for videos imported from external cameras.
iMovie for iOS: Some video clips do not appear in the Video browser
After importing or transferring video clips from an external camera to your iPad 2 or later, iPhone 4 or later, or iPod touch (4th generation), the video clips may not appear in the Video browser within iMovie.
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