That's the reason why we use 4Media iPad Max, an easy-to-use application that allows you to easily convert and transfer videos to your iPad.
The process is very simple. Add video files to the conversion queue and choose the output device. With that data, iPad Max will convert videos and adapt them to the best video format for iPad.
Once videos are converted, you choose whether to transfer them to the iTunes catalog or directly to the iPad.
It's one of the best tools for iPad owners. It's easy to use and the results are great.
Although it's thought to be used for iPad, it also includes video conversion options for iPhone and iPod formats.
Trial version converts 3 minutes of each video.