312471 2026-04-16 07:03:14 -0700 RTCInboundRtpStreamStats.trackIdentifier doesn't match MediaStreamTrack.id 2026-04-17 08:39:50 -0700 1 1 1 Unclassified WebKit WebRTC Safari Technology Preview All Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 mariaivanova youennf ahmad.saleem792 tfaltejsek webkit-bug-importer youennf oldest_to_newest 2201049 0 mariaivanova 2026-04-16 07:03:14 -0700 Per the W3C WebRTC Stats spec (https://www.w3.org/TR/webrtc-stats/#dom-rtcinboundrtpstreamstats-trackidentifier): ▎ trackIdentifier is the id attribute of the track object associated with this RTP stream. In Safari stable (Version 26.4), RTCInboundRtpStreamStats.trackIdentifier returned from RTCPeerConnection.getStats() correctly matches MediaStreamTrack.id from RTCRtpReceiver.track. In Safari Technology Preview (Release 241 (WebKit 21625.1.12)), these values diverge - trackIdentifier returns a different UUID than the one assigned to the corresponding MediaStreamTrack. Steps to reproduce: 1. Open https://jsfiddle.net/masha241/4kpx3zrh/1/ 2. Click Start to establish a loopback peer connection 3. Click Check Stats to compare receiver.track.id with the trackIdentifier field from the inbound-rtp stats report Expected: Both values are the same string Actual (Safari Technology Preview): trackIdentifier is a different UUID than MediaStreamTrack.id Impact: Any application that correlates per-track WebRTC stats with MediaStreamTrack objects using this field (as the spec intends) will fail to match them 2201152 1 webkit-bug-importer 2026-04-16 11:35:14 -0700 <rdar://problem/174938984> 2201429 2 youennf 2026-04-17 01:55:25 -0700 Pull request: https://github.com/WebKit/WebKit/pull/62961 2201527 3 ews-feeder 2026-04-17 08:39:47 -0700 Committed 311455@main (5f7fdedf0823): <https://commits.webkit.org/311455@main> Reviewed commits have been landed. Closing PR #62961 and removing active labels.