iMovie for iOS: About audio playback to an HDTV using the Apple Digital AV Adapter
Summary
When playing back video full screen from iMovie for iOS (v1.2.1 or later) to an HDTV via the Apple AV Adapter, audio is routed through the HDMI connection.
Products Affected
iMovie for iOS
To hear this audio, make sure the HDTV to which you are connected can provide audio playback.
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Read more http://support.apple.com/kb/HT4655