diff --git a/handshake.go b/handshake.go
index 031f858..b15bf52 100644
--- a/handshake.go
+++ b/handshake.go
@@ -115,7 +115,7 @@ func (nc *NetConnection) simple_handshake(C1 []byte) error {
 	copy(S0S1[5:], "Monibuca")
 	nc.Write(S0S1)
 	nc.Write(C1) // S2
-	if C2 := ReadBuf(nc.Reader, C1S1_SIZE); bytes.Compare(C2[8:], S0S1[9:]) != 0 {
+	if C2 := ReadBuf(nc.Reader, C1S1_SIZE); conf.C2 && bytes.Compare(C2[8:], S0S1[9:]) != 0 {
 		return errors.New("C2 Error")
 	}
 	return nil
diff --git a/main.go b/main.go
index dc7523f..c105eb8 100644
--- a/main.go
+++ b/main.go
@@ -20,6 +20,7 @@ type RTMPConfig struct {
 	config.Push
 	ChunkSize int  `default:"65535" desc:"分片大小"`
 	KeepAlive bool `desc:"保持连接，流断开不关闭连接"` //保持rtmp连接，默认随着stream的close而主动断开
+	C2        bool `desc:"握手是否检查C2"`
 }
 
 func pull(streamPath, url string) {
diff --git a/netConnection.go b/netConnection.go
index b6d04e6..960cad9 100644
--- a/netConnection.go
+++ b/netConnection.go
@@ -160,7 +160,6 @@ func (conn *NetConnection) readChunk() (msg *Chunk, err error) {
 		return nil, err
 	}
 	if chunk.AVData.Push(mem); chunk.AVData.ByteLength == msgLen {
-		chunk.ChunkHeader.ExtendTimestamp += chunk.ChunkHeader.Timestamp
 		msg = chunk
 		switch chunk.MessageTypeID {
 		case RTMP_MSG_AUDIO, RTMP_MSG_VIDEO:
@@ -236,16 +235,26 @@ func (conn *NetConnection) readChunkType(h *ChunkHeader, chunkType byte) (err er
 			}
 		}
 	}
-
+	
 	// ExtendTimestamp 4 bytes
 	if h.Timestamp >= 0xffffff { // 对于type 0的chunk,绝对时间戳在这里表示,如果时间戳值大于等于0xffffff(16777215),该值必须是0xffffff,且时间戳扩展字段必须发送,其他情况没有要求
 		if _, err = conn.ReadFull(b4); err != nil {
 			return err
 		}
 		util.GetBE(b4, &h.Timestamp)
-	}
-	if chunkType == 0 {
-		h.ExtendTimestamp = h.Timestamp
+		switch chunkType {
+		case 0:
+			h.ExtendTimestamp = h.Timestamp
+		case 1, 2:
+			h.ExtendTimestamp += (h.Timestamp -0xffffff)
+		}
+	} else {
+		switch chunkType {
+		case 0:
+			h.ExtendTimestamp = h.Timestamp
+		case 1, 2:
+			h.ExtendTimestamp += h.Timestamp
+		}
 	}
 	return nil
 }