On the road to HDR

[youennf]

HDR is already feasible in Chrome, at least on decoding side, with the combination of VP9-P2 and using the color space RTP header extension to provide the necessary HDR color space info.

A few things that seems worth doing to improve interop in that field:

• Standardise at the IETF the color space RTP header extension
• Mention the ability to transmit HDR in spec
• Write WPT tests

A few things that seem worth exploring:

• Should WebRTC encoded transform be able to expose/change the color space info (on receiver side at least)? Should it be left to MediaStreamTrackProcessor/VideoTrackGenerator?
• Should getUserMedia/getDisplayMedia tracks expose/allow controlling whether they are generating HDR content?
• Other shortcomings?

[jan-ivar]

This issue was discussed at the WebRTC 16 June 2026 meeting (transcribed from video):

Q is should we standardize the color space RTP header extension.
[Broad interest in HDR (opt in)]