Hello,

Reply below.

On 10/12/2021 1:13 PM, Siva Viswanathan wrote:
> We already started looking at it and we realized that we need 8.4 profile 
> spec to validate the implementation, hence the delay here
> 
> Please share the relevant info

8.4 is the same as the other profile 8s, except with an HLG base layer,
that is, CICP codepoint 18 (ARIB-STD-B67), as noted, for example, here
(embeds + contains PDF link):

https://professionalsupport.dolby.com/s/article/What-is-Dolby-Vision-Profile?language=en_US

Section 2.1 is probably what you want.

It's worth noting this patch is what we use for our (Vimeo's) 8.4 support.
Not sure what I can officially say, but you can draw your own conclusions :).

- Derek

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