Adds a boolean property to RTCConfiguration.offerExtmapAllowMixed() to enable the extmap-allow-mixed attribute in a session description protocol (SDP) offer. The SDP attribute extmap-allow-mixed, as defined in RFC8285, will be included in the SDP offer if this property is set to true. The SDP attribute extmap-allow-mixed is supported from Chrome 71, but due to backwards compatibility problems it was not included in the SDP offer by default.

Documentation

Specification

Specification link


Proposal in a personal repository, no adoption from community

Status in Chromium

Blink>WebRTC


Enabled by default (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

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Owners

Comments

This property is purely transitional. Initially it will be off by default. We hope to change the default to on when enough clients have updated their code. We hope that eventually backwards compatibility will not be needed and we can remove it completely.

Last updated on 2021-01-12