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Why is Google supporting HEVC on Android but not on youtube?
it's a compatibility thing, Google is not supporting hevc in that manner, its because many video apps default to record to HEVC and then apps that cannot afford licensing, or whatever other reason, are then incompatible with that app.
But don't they transcode it later from source into AVC -> VP9 -> AV1?
All video you can watch on YouTube are transcoded. The source is not available (I imagine they keep it on their servers for later transcoding to future codecs, but I am not sure). YouTube mainly serves VP9 or AVC (when VP9 is not available), they still have a few VP8 and plan to transition to AV1 (already some videos available). HEVC is not available and will never be. YouTube won't wast money on HEVC encoding licenses (not even talking about the computing power and storage space) while they have VP9 providing similar results and AVC for compatibility (much more commonly supported than HEVC).
Why is Google supporting HEVC on Android but not on youtube?
they only support h265 in devices that have a h265 hardware decoder therefore google doesn't have to pay a licence fee as the fee is paid by the chip vendor.
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