diff --git a/rtmp/amf.go b/rtmp/amf.go
index 5471328f..d6bbb3e4 100644
--- a/rtmp/amf.go
+++ b/rtmp/amf.go
@@ -321,8 +321,7 @@ func C_AMF_PropEncode(p *C_AMFObjectProperty, dst []byte) *byte {
 		dst[0] = AMF_NULL
 		pBuffer = &dst[1]
 	case AMF_OBJECT:
-		b, e := b2pp(dst)
-		pBuffer = C_AMF_Encode(&p.p_vu.p_object, b, e)
+		pBuffer = C_AMF_Encode(&p.p_vu.p_object, dst)
 	case AMF_ECMA_ARRAY:
 		b, e := b2pp(dst)
 		pBuffer = C_AMF_EncodeEcmaArray(&p.p_vu.p_object, b, e)
@@ -554,14 +553,15 @@ func C_AMFProp_Reset(prop *C_AMFObjectProperty) {
 
 // char* AMF_Encode(AMFObject* obj, char* pBuffer, char* pBufEnd);
 // amf.c +891
-func C_AMF_Encode(obj *C_AMFObject, pBuffer *byte, pBufEnd *byte) *byte {
-	if uintptr(unsafe.Pointer(pBuffer))+uintptr(4) >= uintptr(unsafe.Pointer(pBufEnd)) {
+func C_AMF_Encode(obj *C_AMFObject, dst []byte) *byte {
+	if len(dst) < 5 {
 		return nil
 	}
 
-	*pBuffer = AMF_OBJECT
-	pBuffer = (*byte)(incBytePtr(unsafe.Pointer(pBuffer), 1))
+	dst[0] = AMF_OBJECT
+	dst = dst[1:]
 
+	pBuffer, pBufEnd := b2pp(dst)
 	for i := 0; i < len(obj.o_props); i++ {
 		res := C_AMF_PropEncode(&obj.o_props[i], pp2b(pBuffer, pBufEnd))
 		if res == nil {
@@ -571,12 +571,13 @@ func C_AMF_Encode(obj *C_AMFObject, pBuffer *byte, pBufEnd *byte) *byte {
 			pBuffer = res
 		}
 	}
+	dst = pp2b(pBuffer, pBufEnd)
 
-	if uintptr(incBytePtr(unsafe.Pointer(pBuffer), 3)) >= uintptr(unsafe.Pointer(pBufEnd)) {
+	if len(dst) < 4 {
 		return nil
 	}
 
-	pBuffer = C_AMF_EncodeInt24(pp2b(pBuffer, pBufEnd), int32(AMF_OBJECT_END))
+	pBuffer = C_AMF_EncodeInt24(dst, AMF_OBJECT_END)
 
 	return pBuffer
 }