Apparently, Apples bigger than bigger iPhones are capable of handling 4K video playback.
The iPhone 6 and the iPhone 6 Plus have native resolutions of 1,335 x 750 and 1,920 x 1,080, respectively. But thanks to their 64-bit desktop-class architecture Apple A8 chip, the new iPhones can play 4K video, albeit at a lower resolution than the UHDTV resolution of 3,840 x 2,160 at least.
As reported by TUAW, the devices 4K video playback capability was first discovered by Softorino, the company behind the drag-and-drop Mac-to-iOS video transfer app WALTR:
The discovery was made by the developers of WALTR, a great Mac app that allows users to quickly upload video files to their iPhone which aren’t supported by iTunes, such as FLAC and MKV files. While testing the app developers found it is possible to playback 4K videos on the iPhone 6. Even if Apple hasn’t announced it, the iPhone 6 and 6 Plus are ready to play 4K videos.
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Of course, loading 4K videos on the iPhone 6 and the iPhone 6 Plus is impractical, given the significantly large sizes of such files. But its nonetheless good to know that they can be played on the handsets if need or want be, without requiring additional software.
Recording 4K video on the iPhone 6 and the iPhone 6 Plus, on the other hands, is possible using third-party apps such as the $50 Vizzywig 8xHD app.