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TubeTV is free software for Mac OS X, where you are available to search for, save, and convert Google Video and YouTube videos to a format suitable for playback on your favorite devices, like iPhone, Apple TV High quality video conversions using the H.264 codec are performed with QuickTime. Double clicking on a converted video file will open it in iTunes allowing easy library addition and syncing to your desired device.

Downloal: TubeTV
(Requirement)
QuickTime 7.1.5 or higher

Link & Image: chimoosoft