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Timestamps for RTC Encoded Frames

Category

WebRTC

Type

New or changed feature

Status

In development (Chrome In development)

Intent stage

None

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

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

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