Log RTP stream start time and more details when adjusting first packet time. (#1983)

Trying to understand first packet time jumps on migration.

pkg/sfu/buffer/rtpstats.go

@@ -402,6 +402,14 @@ func (r *RTPStats) Update(rtph *rtp.Header, payloadSize int, paddingSize int, pa
 				extStartSNOverridden: r.extStartSN,
 			}
 		}
+
+		r.logger.Debugw(
+			"rtp stream start",
+			"startTime", r.startTime.String(),
+			"firstTime", r.firstTime.String(),
+			"startSN", r.extStartSN,
+			"startTS", r.extStartTS,
+		)
 	}
 
 	if r.resyncOnNextPacket {
@@ -529,7 +537,7 @@ func (r *RTPStats) maybeAdjustStart(rtph *rtp.Header, pktSize uint64, hdrSize ui
 		r.tsCycles++
 	}
 	r.logger.Infow(
-		"adjusting starting sequence number",
+		"adjusting start",
 		"snBefore", snBeforeAdjust,
 		"snAfter", r.extStartSN,
 		"snCyles", r.cycles,
@@ -817,8 +825,13 @@ func (r *RTPStats) maybeAdjustFirstPacketTime(ts uint32) {
 	if firstTime.Before(r.firstTime) {
 		r.logger.Debugw(
 			"adjusting first packet time",
+			"startTime", r.startTime.String(),
+			"nowTime", now.String(),
 			"before", r.firstTime.String(),
 			"after", firstTime.String(),
+			"adjustment", r.firstTime.Sub(firstTime),
+			"nowTS", ts,
+			"extStartTS", r.extStartTS,
 		)
 		if r.firstTime.Sub(firstTime) > firstPacketTimeAdjustThreshold {
 			r.logger.Infow("first packet time adjustment too big, ignoring",