client: fix h264 decoding

client.go

@@ -673,6 +673,13 @@ func (c *Client) playRecordStart() {
 	c.writeMutex.Unlock()
 
 	if c.state == clientStatePlay {
+		for _, ct := range c.tracks {
+			if _, ok := ct.track.(*TrackH264); ok {
+				ct.h264Decoder = &rtph264.Decoder{}
+				ct.h264Decoder.Init()
+			}
+		}
+
 		c.keepaliveTimer = time.NewTimer(c.keepalivePeriod)
 
 		switch *c.effectiveTransport {
@@ -716,15 +723,7 @@ func (c *Client) playRecordStart() {
 			v := time.Now().Unix()
 			c.tcpLastFrameTime = &v
 		}
-	} else {
-		for _, ct := range c.tracks {
-			if _, ok := ct.track.(*TrackH264); ok {
-				ct.h264Decoder = &rtph264.Decoder{}
-				ct.h264Decoder.Init()
-			}
-		}
-
-		if *c.effectiveTransport == TransportUDP {
+	} else if *c.effectiveTransport == TransportUDP {
 		for trackID, cct := range c.tracks {
 			ctrackID := trackID
 
@@ -739,7 +738,6 @@ func (c *Client) playRecordStart() {
 			cct.udpRTCPListener.start(false)
 		}
 	}
-	}
 
 	// for some reason, SetReadDeadline() must always be called in the same
 	// goroutine, otherwise Read() freezes.