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By then time hardware support for these codecs come out most of these iOS devcices will be obsolete.

Apple won't switch codecs again shortly after going the HEVC/HEIF route. All new iPhones will stay there.

I think Apple's hand will be forced by major content providers. Hulu, YouTube, Amazon, Facebook, and Netflix all want AV1. YouTube and Netflix in particular want to adopt AV1 quickly. Netflix has been talking about supporting AV1 by the second quarter of this year:

https://streaminglearningcenter.com/codecs/netflix-on-av1.ht...

They won't remove support for HEVC/HEIF for quite some time, but they will support AV1 alongside them, why else would they join AOM at the top level (governing member) ?

This means AV1 will be the de facto next generation codec standard on the web as it will be supported by all browsers and all mobile devices, something HEVC never will.

HEIF itself is an image container format that supports a number of different image formats (like HEVC, AVC, and JPEG):

https://github.com/nokiatech/heif

Apple could and probably will add AV1 support to their HEIF implementation in the future.

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