Log more around unexpected cases (#2813)

- too many padding packets
- also fix cse of snapshot not getting any packets

pkg/sfu/buffer/rtpstats_base.go

@@ -38,7 +38,7 @@ const (
 
 	cPassthroughNTPTimestamp = true
 
-	cSequenceNumberLargeJumpThreshold = 1000
+	cSequenceNumberLargeJumpThreshold = 100
 )
 
 // -------------------------------------------------------
@@ -583,6 +583,9 @@ func (r *rtpStatsBase) deltaInfo(snapshotID uint32, extStartSN uint64, extHighes
 	endTime := now.startTime
 
 	packetsExpected := now.extStartSN - then.extStartSN
+	if then.extStartSN > extHighestSN {
+		packetsExpected = 0
+	}
 	if packetsExpected > cNumSequenceNumbers {
 		r.logger.Infow(
 			"too many packets expected in delta",
@@ -614,8 +617,10 @@ func (r *rtpStatsBase) deltaInfo(snapshotID uint32, extStartSN uint64, extHighes
 			"padding packets more than expected",
 			"packetsExpected", packetsExpected,
 			"packetsPadding", packetsPadding,
+			"packetsLost", packetsLost,
 			"startSequenceNumber", then.extStartSN,
 			"endSequenceNumber", now.extStartSN-1,
+			"rtpStats", r,
 		)
 		packetsExpected = 0
 	} else {