rtmp: Do not send the first field twice within the handshake

libavformat/rtmpproto.c

@@ -1349,7 +1349,7 @@ static int rtmp_send_hs_packet(RTMPContext* rt, uint32_t first_int,
     int inoutsize;
 
     AV_WB32(arraydata, first_int);
-    AV_WB32(arraydata + 4, first_int);
+    AV_WB32(arraydata + 4, second_int);
     inoutsize = ffurl_write(rt->stream, arraydata,
                             RTMP_HANDSHAKE_PACKET_SIZE);
     if (inoutsize != RTMP_HANDSHAKE_PACKET_SIZE) {