diff --git a/rtmp/rtmp.go b/rtmp/rtmp.go
index 218bbb46..f4fe36e2 100644
--- a/rtmp/rtmp.go
+++ b/rtmp/rtmp.go
@@ -108,8 +108,8 @@ func byteSliceToCArr(buf []byte) *C.char {
 
 func (s *session) rtmpWrite(r *C.RTMP, buf []byte) int {
 	var pkt *C.RTMPPacket = &r.m_write
-	size := len(buf)
 	var enc unsafe.Pointer
+	size := len(buf)
 	s2 := size
 	var ret, num int
 
@@ -186,8 +186,6 @@ func (s *session) rtmpWrite(r *C.RTMP, buf []byte) int {
 
 		pkt.m_nBytesRead += C.uint(num)
 		s2 -= num
-
-		//buf += num
 		buf = buf[num:]
 
 		if pkt.m_nBytesRead == pkt.m_nBodySize {