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Dunno what versions are supported but Apple itself indirectly told us that hardware HEVC encode and decode support is there with A8. The HEVC encoding was used for FaceTime for iOS 8. In fact it was listed right in the specs. No, it didn't explicitly say it was hardware encoding, but we can be pretty sure this means hardware, since I wouldn't expect the A8 to do real-time HEVC encoding in software obviously.How do you know if the HEVC hardware is there? Not to mention what HEVC versions are actually supported?
I was all excited to see that at the iPhone 6 launch because I thought that meant any new iPad I bought would have hardware video decoding once the developers implemented it. But that never happened because never exposed this feature to developers, and in fact, Apple stopped talking about it altogether for whatever reason.
AnandTech smartly captured a screengrab of those specs, in its iPhone 6 review:
In any case, while we can’t identify individual blocks on A8 we do know that Apple has added a few features to A8 that are present in some form or another among these blocks. New to A8 is some mix of H.265 (HEVC) hardware, which would be necessary to enable the FaceTime over H.265 functionality that is being introduced on the iPhone 6.