libavutil/rc4.c:40: error: Uninitialized Value
  The value read from state[_] was never initialized.

libavutil/rc4.c:40:12: 
38.     }
39.     // state initialized, now do the real encryption
40.     x = 1; y = state[1];
               ^
41.     while (datalen-- > 0) {
42.         uint8_t sum = state[x] + state[y];
