diff --git a/app/httpflvpull/httpflvpull.go b/app/httpflvpull/httpflvpull.go
index a4230aa..f35dbce 100644
--- a/app/httpflvpull/httpflvpull.go
+++ b/app/httpflvpull/httpflvpull.go
@@ -26,16 +26,23 @@ func main() {
 	session := httpflv.NewPullSession()
 	abr := bitrate.New()
 	vbr := bitrate.New()
+	prevTs := int64(-1)
 	var runFlag nazaatomic.Bool
 	runFlag.Store(true)
 	go func() {
 		for runFlag.Load() {
 			time.Sleep(1 * time.Second)
-			log.Infof("bitrate. audio=%fkb/s, video=%fkb/s", abr.Rate(), vbr.Rate())
+			//log.Infof("bitrate. audio=%fkb/s, video=%fkb/s", abr.Rate(), vbr.Rate())
 		}
 	}()
 	err := session.Pull(url, func(tag httpflv.Tag) {
-		//log.Infof("onReadFLVTag. %+v %t %t", tag.Header, tag.IsAVCKeySeqHeader(), tag.IsAVCKeyNalu())
+		now := time.Now().UnixNano() / 1e6
+		if prevTs != -1 {
+			//log.Infof("%v", now - prevTs)
+		}
+		prevTs = now
+
+		log.Infof("onReadFLVTag. %+v %t %t", tag.Header, tag.IsAVCKeySeqHeader(), tag.IsAVCKeyNalu())
 		switch tag.Header.Type {
 		case httpflv.TagTypeAudio:
 			abr.Add(len(tag.Raw))
diff --git a/go.mod b/go.mod
index 49922c4..172ae0f 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module github.com/q191201771/lal
 
 go 1.12
 
-require github.com/q191201771/naza v0.7.0
+require github.com/q191201771/naza v0.7.1
diff --git a/go.sum b/go.sum
index 0062481..1399a5e 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-github.com/q191201771/naza v0.7.0 h1:nWpxx17hulHvHNYWIYIiMq/xca5lwW8+JocFYFbsveg=
-github.com/q191201771/naza v0.7.0/go.mod h1:SE14GBGO9mAn6JZl3NlfWGtNOT7xQjxOG7f3YOdBThM=
+github.com/q191201771/naza v0.7.1 h1:+kkUyEEMAGrXBRN7PJMQYCJTMc1/llXBuK4N09x1dQI=
+github.com/q191201771/naza v0.7.1/go.mod h1:SE14GBGO9mAn6JZl3NlfWGtNOT7xQjxOG7f3YOdBThM=
diff --git a/pkg/logic/gop_cache.go b/pkg/logic/gop_cache.go
index b33414c..e82d9bf 100644
--- a/pkg/logic/gop_cache.go
+++ b/pkg/logic/gop_cache.go
@@ -8,7 +8,9 @@
 
 package logic
 
-import "github.com/q191201771/lal/pkg/rtmp"
+import (
+	"github.com/q191201771/lal/pkg/rtmp"
+)
 
 type LazyChunkDivider struct {
 	message []byte
diff --git a/pkg/logic/group.go b/pkg/logic/group.go
index 1d83f0a..ad90ccd 100644
--- a/pkg/logic/group.go
+++ b/pkg/logic/group.go
@@ -168,6 +168,8 @@ func (group *Group) broadcastRTMP(msg rtmp.AVMsg) {
 
 	// # 1. 设置好用于发送的 rtmp 头部信息
 	currHeader := Trans.MakeDefaultRTMPHeader(msg.Header)
+	// TODO 这行代码是否放到 MakeDefaultRTMPHeader 中
+	currHeader.MsgLen = uint32(len(msg.Payload))
 	lcd.Init(msg.Payload, &currHeader)
 
 	// # 2. 广播。遍历所有 rtmp sub session，决定是否转发
@@ -263,7 +265,7 @@ func (group *Group) broadcastRTMP(msg rtmp.AVMsg) {
 		}
 		group.metadata = lcd.Get()
 		group.metadataTag = currTag
-		log.Debugf("cache metadata. [%s]", group.UniqueKey)
+		log.Debugf("cache metadata. [%s] rtmp size:%d, flv size:%d", group.UniqueKey, len(group.metadata), group.metadataTag.Header.DataSize)
 	case rtmp.TypeidVideo:
 		// TODO chef: magic number
 		if msg.Payload[0] == 0x17 && msg.Payload[1] == 0x0 {
@@ -272,7 +274,7 @@ func (group *Group) broadcastRTMP(msg rtmp.AVMsg) {
 			}
 			group.avcKeySeqHeader = lcd.Get()
 			group.avcKeySeqHeaderTag = currTag
-			log.Debugf("cache avc key seq header. [%s]", group.UniqueKey)
+			log.Debugf("cache avc key seq header. [%s] rtmp size:%d, flv size:%d", group.UniqueKey, len(group.avcKeySeqHeader), group.avcKeySeqHeaderTag.Header.DataSize)
 		}
 	case rtmp.TypeidAudio:
 		if (msg.Payload[0]>>4) == 0x0a && msg.Payload[1] == 0x0 {
@@ -281,7 +283,7 @@ func (group *Group) broadcastRTMP(msg rtmp.AVMsg) {
 			}
 			group.aacSeqHeader = lcd.Get()
 			group.aacSeqHeaderTag = currTag
-			log.Debugf("cache aac seq header. [%s]", group.UniqueKey)
+			log.Debugf("cache aac seq header. [%s] rtmp size:%d, flv size:%d", group.UniqueKey, len(group.aacSeqHeader), group.aacSeqHeaderTag.Header.DataSize)
 		}
 	}
 }
diff --git a/pkg/rtmp/client_session.go b/pkg/rtmp/client_session.go
index 0e61bc0..ef4f6d6 100644
--- a/pkg/rtmp/client_session.go
+++ b/pkg/rtmp/client_session.go
@@ -200,7 +200,7 @@ func (s *ClientSession) doMsg(stream *Stream) error {
 	case TypeidVideo:
 		s.onReadRTMPAVMsg(stream.toAVMsg())
 	default:
-		log.Errorf("read unknown msg type id. [%s] typeid=%+v", s.UniqueKey, stream.header)
+		log.Errorf("read unknown message. [%s] typeid=%d, %s", s.UniqueKey, stream.header.MsgTypeID, stream.toDebugString())
 		panic(0)
 	}
 	return nil
@@ -248,7 +248,7 @@ func (s *ClientSession) doCommandMessage(stream *Stream) error {
 	case "onStatus":
 		return s.doOnStatusMessage(stream, tid)
 	default:
-		log.Errorf("read unknown cmd. [%s] cmd=%s", s.UniqueKey, cmd)
+		log.Errorf("read unknown command message. [%s] cmd=%s, %s", s.UniqueKey, cmd, stream.toDebugString())
 	}
 
 	return nil
@@ -357,7 +357,7 @@ func (s *ClientSession) doProtocolControlMessage(stream *Stream) error {
 		// composer内部会自动更新peer chunk size.
 		log.Infof("-----> Set Chunk Size %d. [%s]", val, s.UniqueKey)
 	default:
-		log.Errorf("unknown msg type id. [%s] id=%d", s.UniqueKey, stream.header.MsgTypeID)
+		log.Errorf("read unknown protocol control message. [%s] typeid=%d, %s", s.UniqueKey, stream.header.MsgTypeID, stream.toDebugString())
 	}
 	return nil
 }
diff --git a/pkg/rtmp/server.go b/pkg/rtmp/server.go
index 775408d..ca4dcff 100644
--- a/pkg/rtmp/server.go
+++ b/pkg/rtmp/server.go
@@ -68,7 +68,8 @@ func (server *Server) Dispose() {
 func (server *Server) handleTCPConnect(conn net.Conn) {
 	log.Infof("accept a rtmp connection. remoteAddr=%v", conn.RemoteAddr())
 	session := NewServerSession(server, conn)
-	_ = session.RunLoop()
+	err := session.RunLoop()
+	log.Infof("rtmp loop done. [%s] err=%v", session.UniqueKey, err)
 	switch session.t {
 	case ServerSessionTypeUnknown:
 	// noop
diff --git a/pkg/rtmp/server_session.go b/pkg/rtmp/server_session.go
index f58de9f..12336e8 100644
--- a/pkg/rtmp/server_session.go
+++ b/pkg/rtmp/server_session.go
@@ -9,7 +9,6 @@
 package rtmp
 
 import (
-	"encoding/hex"
 	"net"
 	"strings"
 
@@ -146,10 +145,9 @@ func (s *ServerSession) doMsg(stream *Stream) error {
 			log.Errorf("read audio/video message but server session not pub type. [%s]", s.UniqueKey)
 			return ErrRTMP
 		}
-		//log.Infof("t:%d ts:%d len:%d", stream.header.MsgTypeID, stream.header.timestampAbs, stream.msg.e - stream.msg.b)
 		s.avObs.OnReadRTMPAVMsg(stream.toAVMsg())
 	default:
-		log.Warnf("unknown message. [%s] typeid=%d", s.UniqueKey, stream.header.MsgTypeID)
+		log.Warnf("read unknown message. [%s] typeid=%d, %s", s.UniqueKey, stream.header.MsgTypeID, stream.toDebugString())
 
 	}
 	return nil
@@ -174,7 +172,7 @@ func (s *ServerSession) doDataMessageAMF0(stream *Stream) error {
 
 	switch val {
 	case "|RtmpSampleAccess":
-		log.Warn("recv |RtmpSampleAccess. ignore it.")
+		log.Warnf("read data message, ignore it. [%s] val=%s", s.UniqueKey, val)
 		return nil
 	case "@setDataFrame":
 		// macos obs
@@ -185,12 +183,13 @@ func (s *ServerSession) doDataMessageAMF0(stream *Stream) error {
 			return err
 		}
 		if val != "onMetaData" {
+			log.Errorf("read unknown data message. [%s] val=%s, %s", s.UniqueKey, val, stream.toDebugString())
 			return ErrRTMP
 		}
 	case "onMetaData":
 		// noop
 	default:
-		log.Errorf("recv unknown message. val=%s, hex=%s", val, hex.Dump(stream.msg.buf[stream.msg.b:stream.msg.e]))
+		log.Errorf("read unknown data message. [%s] val=%s, %s", s.UniqueKey, val, stream.toDebugString())
 		return nil
 	}
 
@@ -224,9 +223,9 @@ func (s *ServerSession) doCommandMessage(stream *Stream) error {
 	case "FCUnpublish":
 		fallthrough
 	case "getStreamLength":
-		log.Warnf("read command message,ignore it. [%s] %s", s.UniqueKey, cmd)
+		log.Warnf("read command message, ignore it. [%s] cmd=%s, %s", s.UniqueKey, cmd, stream.toDebugString())
 	default:
-		log.Errorf("unknown cmd. [%s] cmd=%s", s.UniqueKey, cmd)
+		log.Errorf("read unknown command message. [%s] cmd=%s, %s", s.UniqueKey, cmd, stream.toDebugString())
 	}
 	return nil
 }
diff --git a/pkg/rtmp/stream.go b/pkg/rtmp/stream.go
index 604410b..a7702a6 100644
--- a/pkg/rtmp/stream.go
+++ b/pkg/rtmp/stream.go
@@ -8,7 +8,12 @@
 
 package rtmp
 
-import log "github.com/q191201771/naza/pkg/nazalog"
+import (
+	"encoding/hex"
+	"fmt"
+
+	log "github.com/q191201771/naza/pkg/nazalog"
+)
 
 const initMsgLen = 4096
 
@@ -41,6 +46,13 @@ func NewStream() *Stream {
 	}
 }
 
+// 序列化成可读字符串，一般用于发生错误时打印日志
+func (stream *Stream) toDebugString() string {
+	// 注意，这里打印的二进制数据的其实位置是从 0 开始，而不是 msg.b 位置
+	return fmt.Sprintf("header=%+v, b=%d, hex=%s",
+		stream.header, stream.msg.b, hex.Dump(stream.msg.buf[:stream.msg.e]))
+}
+
 func (stream *Stream) toAVMsg() AVMsg {
 	return AVMsg{
 		Header:  stream.header,
@@ -80,6 +92,10 @@ func (msg *StreamMsg) clear() {
 	msg.e = 0
 }
 
+//func (msg *StreamMsg) bytes() []byte {
+//	return msg.buf[msg.b: msg.e]
+//}
+
 func (msg *StreamMsg) peekStringWithType() (string, error) {
 	str, _, err := AMF0.ReadString(msg.buf[msg.b:msg.e])
 	return str, err