IBook Author of the video size

I would like to know what's best way to set up iBook Author of the video size and format file for all ipad devices including ipad air.
I already knew about this part:
   •    To create up to a 420p movie: Select “iPod touch & iPhone 3GS.”
   •    To create up to a 720p movie: Select “iPad, iPhone 4 & Apple TV.”
   •    The numbers refer to the number of vertical lines. For the best quality, select the 720p (iPad) option
I wonder if I can set up the aspect ratios like 4:3 frame (small video of box with story) in iBook Author for ipad air to be able to see this on full screen from iBook shelf.  I have ipad and ipad mini but I don't have ipad air.  I wonder if it will have good quality video like 4:3 ratio for ipad air screen with Retina display? Since Apple support didn't provide enough details how the overall video would look like on screen without stretching or using proper proportions.
Thanks,
Alfredo

If you create a 1024x768 video, you will be making the fullest possible use of screen real estate on a non-retina iPad (no letter boxing or pillars needed). Double that to 2048x1536 for retina.
Having said that, I should  point out that the dynamic duo of iOS and the iPad;s video firmware provide some of the best scaling routines I have seen. So 1024x768 video on a retina iPad will look just fine. With moving pictures, high resolution doesn't return as much benefit as it does with static images.
It would be interesting to see what the video optimizer in iBooks Author does with 2048x1536 video. To find out, we'll need to use iBooks Author to create project file that includes a 2048x1537 video and then export as *ibooks and deconstruct that *.ibooks file.

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