diff --git a/rtmp/rtmp.go b/rtmp/rtmp.go
index 15ffaed7..7f330aac 100644
--- a/rtmp/rtmp.go
+++ b/rtmp/rtmp.go
@@ -144,15 +144,14 @@ func rtmpWrite(r *C.RTMP, data []byte) int {
 				s2 -= 13
 			}
 
-			buf = (*C.char)(unsafe.Pointer(uintptr(unsafe.Pointer(buf)) + uintptr(1)))
 			pkt.m_packetType = C.uchar(*(*byte)(unsafe.Pointer(buf)))
-
+			buf = (*C.char)(unsafe.Pointer(uintptr(unsafe.Pointer(buf)) + uintptr(1)))
 			pkt.m_nBodySize = C.AMF_DecodeInt24(buf)
 			buf = (*C.char)(unsafe.Pointer(uintptr(unsafe.Pointer(buf)) + uintptr(3)))
 			pkt.m_nTimeStamp = C.AMF_DecodeInt24(buf)
-			buf = (*C.char)(unsafe.Pointer(uintptr(unsafe.Pointer(buf)) + uintptr(4)))
-			pkt.m_nTimeStamp |= C.uint(*(*byte)(unsafe.Pointer(buf)) << 24)
 			buf = (*C.char)(unsafe.Pointer(uintptr(unsafe.Pointer(buf)) + uintptr(3)))
+			pkt.m_nTimeStamp |= C.uint(*(*byte)(unsafe.Pointer(buf)) << 24)
+			buf = (*C.char)(unsafe.Pointer(uintptr(unsafe.Pointer(buf)) + uintptr(4)))
 			s2 -= 11
 
 			if ((pkt.m_packetType == C.RTMP_PACKET_TYPE_AUDIO ||