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Re: Exposing HDR metadata in bitstreams through WebCodecs API

From: Wan-Teh Chang <wtc@google.com>
Date: Mon, 25 Oct 2021 18:59:20 -0700
Message-ID: <CALTJjxHhnMvSBt5u61DNx2YCdyijUOJpDJnfaj9VtRn3fv1Qxw@mail.gmail.com>
To: Pierre-Anthony Lemieux <pal@sandflow.com>
Cc: public-colorweb@w3.org
Hi Pierre-Anthony,

On Mon, Oct 25, 2021 at 3:39 PM Pierre-Anthony Lemieux <pal@sandflow.com> wrote:
> It was pointed out earlier today that now would be a good time to
> identify any HDR/WCG metadata present at the video codec bitstream
> level (as opposed to metadata at the container level), so that the
> metadata can be exposed through the WebCodecs API.
> Please reply to this thread if any such metadata comes to mind.

AV1 has two HDR metadata types: METADATA_TYPE_HDR_CLL and
METADATA_TYPE_HDR_MDCV. See the AV1 specification:

In addition, the AV1 metadata type METADATA_TYPE_ITUT_T35 is
extensible and can be used to carry HDR10+ dynamic metadata. See

Wan-Teh Chang
Received on Tuesday, 26 October 2021 01:59:43 UTC

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