I know this is a fairly old post, but just incase anyone is still looking.. you can use an app called Beamer to AirPlay any file format to Apple tv. I've been using it for a while now and it's amazing.
Is this a mac apps tore app. I dont see it on the ios apps store. I do see another app called beamAir.
It's a Mac app and you can download it from Beamer-app.com. Here's a full blog post on Burnedcast.com that'll answer most of your questions: How to AirPlay Any Video Format From Your Mac.
Let me know if you have any more questions
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