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YouTube moves to AV1 by default to the dismay of some Android users
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
The proper approach is simply to have the app check the hardware decode capabilities of the device and use the best option. Pretty sure that's what YT has always done for codec transitions in the past.
Forcing AV1 on devices without hardware decode will end up making users think their battery is starting to wear out, even with the better software decoder'