From 2440e66ff166cefc1d60281ae16e471756fdb2f1 Mon Sep 17 00:00:00 2001
From: Milos Pesic <milos.pesic@livekit.io>
Date: Mon, 25 Aug 2025 16:04:16 +0200
Subject: [PATCH] Fixing offset calculation Sender reports shouldn't overwrite
 the desired offset but update it. Also signal the correct diff in onSR
 callbacks,

---
 pkg/synchronizer/track.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pkg/synchronizer/track.go b/pkg/synchronizer/track.go
index 3f886543..3b2adc3f 100644
--- a/pkg/synchronizer/track.go
+++ b/pkg/synchronizer/track.go
@@ -164,14 +164,14 @@ func (t *TrackSynchronizer) onSenderReport(pkt *rtcp.SenderReport) {
 
 	offset := mediatransportutil.NtpTime(pkt.NTPTime).Time().Sub(t.startTime.Add(pts))
 	if t.onSR != nil {
-		t.onSR(offset - t.desiredPTSOffset)
+		t.onSR(offset)
 	}
 
 	if !t.acceptable(offset) {
 		return
 	}
 
-	t.desiredPTSOffset = offset
+	t.desiredPTSOffset += offset
 	t.lastSR = pkt.RTPTime
 }