Apple TV mirroring issues even with Mac mini,airport extreme bought at the end of last year,and an iPad 2

I have the same issue with ATV3 and iPhone 4S. Everything works properly, no buffering issues when watching netflix, vimeo, youtube BUT when I try mirroring even a small 15sec iPhone movie it stutters and buffers and results to a choppy playback..same with larger mp4 files such as 1-1.5GB, buffers forever and never plays, I just re-encoded the same movie to 700MB and plays perfectly..
Why Apple, why?..so close..I can accept the bigger movie files issue, but not being able to playback properly an iPhone movie is funny..I recorded a movie with lower bitrate through Filmic Pro (Economy mode, up to 16Mbps)
and plays properly.
Is there an upcoming software update going to solve the problem or is it hardware related and therefore not fixable.
Please don't reply with a network related answer, by 2012 we know how to set up our networks and everything else runs flawlessly.
I'll apreciate a fast answer, we love Apple, but if it can't play an iphone movie (or a high quality movie from iTunes) it's just not up to my standards.
Thanks again.
JP

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