I'm skeptical of this (I think they avoid adding grain to the AV1 stream which they add to the other streams--of course all grain is artificial in modern times), but even if true--like, all grain is noise! It's random noise from the sensor. There's nothing magical about it.
Does AV1 add it if it's not part of the source?
I dunno, but if there is grain in the source it may erase it (discarding information) then invent new grain (noise) later.
I'm skeptical of this (I think they avoid adding grain to the AV1 stream which they add to the other streams--of course all grain is artificial in modern times), but even if true--like, all grain is noise! It's random noise from the sensor. There's nothing magical about it.
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