Log start time. (#739)

* Log start time and drop audio in pts disable config.

PTS disable is not audio specific. So, changing it to just call it
PTSAdjustmentDisabled. Changes the API a bit, but I think it is the
correct usage as nothing in track synchroniser that is audio specific.

* revert to audio

Author: boks1971

pkg/synchronizer/track.go

@@ -106,20 +106,26 @@ func (t *TrackSynchronizer) Initialize(pkt *rtp.Packet) {
 	t.lastTS = pkt.Timestamp
 	t.lastPTS = 0
 	t.lastPTSAdjusted = t.currentPTSOffset
-	t.logger.Infow("initialized track synchronizer",
+	t.logger.Infow(
+		"initialized track synchronizer",
 		"startRTP", t.startRTP,
 		"currentPTSOffset", t.currentPTSOffset,
 	)
 }
 
-// GetPTS will reset sequence numbers and/or offsets if necessary
+// GetPTS will adjust PTS offsets if necessary
 // Packets are expected to be in order
 func (t *TrackSynchronizer) GetPTS(pkt *rtp.Packet) (time.Duration, error) {
 	t.Lock()
 	defer t.Unlock()
 
 	if t.startTime.IsZero() {
 		t.startTime = time.Now()
+		t.logger.Infow(
+			"starting track synchronizer",
+			"startRTP", t.startRTP,
+			"currentPTSOffset", t.currentPTSOffset,
+		)
 	}
 
 	ts := pkt.Timestamp
@@ -131,8 +137,9 @@ func (t *TrackSynchronizer) GetPTS(pkt *rtp.Packet) (time.Duration, error) {
 	estimatedPTS := time.Since(t.startTime)
 	if pts < t.lastPTS || !t.acceptable(pts-estimatedPTS) {
 		newStartRTP := ts - t.toRTP(estimatedPTS)
-		t.logger.Infow("correcting PTS",
-			"TS", ts,
+		t.logger.Infow(
+			"correcting PTS",
+			"currentTS", ts,
 			"lastTS", t.lastTS,
 			"PTS", pts,
 			"lastPTS", t.lastPTS,