WebCodecs VideoFrame Metadata Registry

Status of this document

This section describes the status of this document at the time of its publication. A list of current W3C publications and the latest revision of this technical report can be found in the W3C standards and drafts index.

Feedback and comments on this specification are welcome. GitHub Issues are preferred for discussion on this specification. Alternatively, you can send comments to the Media Working Group’s mailing-list, public-media-wg@w3.org (archives). This draft highlights some of the pending issues that are still to be discussed in the working group. No decision has been taken on the outcome of these issues including whether they are valid.

This document was published by the Media Working Group as a Registry Draft using the Registry track.

Publication as a Registry Draft does not imply endorsement by W3C and its Members.

This is a draft document and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to cite this document as other than a work in progress.

This document was produced by a group operating under the W3C Patent Policy. W3C maintains a public list of any patent disclosures made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent that the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy.

The W3C Patent Policy does not carry any licensing requirements or commitments on this document.

This document is governed by the 18 August 2025 W3C Process Document.

1. Registration Entry Requirements

To register an entry, file an issue in the WebCodecs GitHub issue tracker so it can be discussed and evaluated for compliance before being added to the registry.

For the entry to be included, there needs to be interest from at least one implementer in either the Media Working Group or the Working Group that originated the registration entry specification. If the Media Working Group reaches consensus to accept the candidate entry, send a pull request (either by editors or by the party requesting the candidate registration) that meets the following requirements:

Each metadata entry is defined as a separate VideoFrameMetadata dictionary member.
Each metadata entry must be serializable.
Each metadata entry must be defined by a W3C specification that has reached consensus in the originating Working Group.
The specification defining each metadata entry must provide clearly defined semantics. In particular, interactions with the media processing pipeline (encoders, decoders, renderers, etc.) should be well defined.

Once consensus is reached by the Media Working Group, the registry editors will review and merge the pull request.

Existing entries may be changed after being published, through the same process as candidate entries. Possible changes include modification of the link to the public specification.

Existing entries may be deprecated. This requires Media Working Group consensus, and if still active, consensus of the Working Group that originated the registration entry specification.

2. VideoFrameMetadata members

member name	public specification
segments	Human face segmentation
captureTime	Capture time
receiveTime	Receive time
rtpTimestamp	RTP timestamp
backgroundBlur	Background blur effect status
backgroundSegmentationMask	Background segmentation mask

3. Privacy Considerations

Please refer to the section Privacy Considerations in [WEBCODECS].

4. Security Considerations

Please refer to the section Security Considerations in [WEBCODECS].

WebCodecs VideoFrame Metadata Registry

Abstract

Status of this document

1. Registration Entry Requirements

2. VideoFrameMetadata members

3. Privacy Considerations

4. Security Considerations

Index

Terms defined by reference

References

Normative References