I have installed Perian on my Apple TV. How can I get iTunes to copy my videos?
In order for iTunes to transfer the videos to your Apple TV they have to be modified in a special way. Since only a small portion of users requires this, the option is not enabled by default. If you want your videos to be modified, open the iFlicks Preferences and select the QuickTime tab. There you’ll find an option labeled “Make compatible with hacked Apple TV”. Once you have enabled this option, all videos imported to iTunes using the QuickTime preset will be transfered to your Apple TV.