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Re: Exposing HDR metadata in bitstreams through WebCodecs API

From: Lars Borg <borg@adobe.com>
Date: Tue, 26 Oct 2021 05:46:48 +0000
To: Pierre-Anthony Lemieux <pal@sandflow.com>, Wan-Teh Chang <wtc@google.com>
CC: "public-colorweb@w3.org" <public-colorweb@w3.org>
Message-ID: <BB537E7A-63D8-4BDA-9FDD-0728C5A2C5B2@adobe.com>
With links to the standards!
Maybe with a list of which parameters are encoded, but hopefully we don’t need to document the code values.


On 10/25/21, 5:03 PM, "Pierre-Anthony Lemieux" <pal@sandflow.com> wrote:

    Hi Wan-Teh,



    How should we catalog these parameters? Markdown on our github repo,
    issue on WebCodes repo, Google doc? Any preference.


    -- Pierre

    On Mon, Oct 25, 2021 at 6:59 PM Wan-Teh Chang <wtc@google.com> wrote:
    > 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:
    > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Faomediacodec.github.io%2Fav1-spec%2Fav1-spec.pdf&amp;data=04%7C01%7Cborg%40adobe.com%7Cf5dcf43304514e0ed30008d9982ccdb5%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C637708141940271300%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=kT%2FOe8m%2B82EtirlIC57grYb0LDzZizdrnT0MmzIt1nk%3D&amp;reserved=0
    > In addition, the AV1 metadata type METADATA_TYPE_ITUT_T35 is
    > extensible and can be used to carry HDR10+ dynamic metadata. See
    > https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdownloads.aomedia.org%2Fassets%2Fpdf%2FAV1-HDR10-Implementation-Note_1202.pdf&amp;data=04%7C01%7Cborg%40adobe.com%7Cf5dcf43304514e0ed30008d9982ccdb5%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C637708141940271300%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=SvvDGLoHn%2FKOH6HLKxg4NK7y2fo9Q7vVdUWqpW7j8KI%3D&amp;reserved=0
    > Wan-Teh Chang

Received on Tuesday, 26 October 2021 05:47:05 UTC

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