Timestamps for RTC Encoded Frames

Category: WebRTC
Type: New or changed feature
Status: In development (Chrome In development)
Intent stage: None

Breaking change: No
Enterprise impact: None
Spec maturity: Working draft
Web Platform Tests: Yes

WPT details: https://wpt.fyi/results/webrtc-encoded-transform/tentative/RTCEncodedFrame-timestamps.html?label=experimental&label=master&aligned

Summary

This feature consists in exposing to the Web some timestamps that are present in WebRTC encoded frames transmitted via RTCPeerConnection. The timestamps in question are: -Capture timestamp: the timestamp when a frame was originally captured -Receive timestamp: the timestamp when a frame was received

Motivation

This change allows VC applications to implement latency measurements to better understand application performance.

Standards & signals

Specification: https://w3c.github.io/webrtc-encoded-transform/#dom-rtcencodedaudioframemetadata-receivetime
Firefox: Positive — No position requested at https://github.com/mozilla/standards-positions since this is a minor addition to an existing spec. Linked to PRs instead (merged into spec or "editors can integrate").
Safari: Positive — No position requested at https://github.com/WebKit/standards-positions/ since this is a minor addition to an existing spec. Linked to PRs instead (merged into spec or "editors can integrate").
Web developers: Positive
Tracking bug: https://crbug.com/391114797

Ecosystem

Web Platform Tests: https://wpt.fyi/results/?q=webrtc-encoded-transform%2Ftentative%2FRTCEncodedFrame-timestamps
Chrome Platform Showcase: https://chrome-platform-showcase.paulkinlan-ea.deno.net/features
GenDN reference: https://gendn.paulkinlan-ea.deno.net/features
chrome.dev demos search: https://www.google.com/search?q=site%3Achrome.dev+Timestamps%20for%20RTC%20Encoded%20Frames
MDN Web Docs: https://developer.mozilla.org/en-US/search?q=Timestamps%20for%20RTC%20Encoded%20Frames
Baseline status: https://webstatus.dev/?q=Timestamps%20for%20RTC%20Encoded%20Frames

Explainers: https://github.com/guidou/webrtc-encoded-transform/blob/master/timestamps.md

View on chromestatus.com