Re: Exposing HDR metadata in bitstreams through WebCodecs API

Hi Pierre-Anthony,

On Mon, Oct 25, 2021 at 3:39 PM Pierre-Anthony Lemieux <> 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