libavutil/rc4.c:37: error: Uninitialized Value
  The value read from state[_] was never initialized.

libavutil/rc4.c:37:9: 
35.         if (j == keylen) j = 0;
36.         y += state[i] + key[j];
37.         FFSWAP(uint8_t, state[i], state[y]);
            ^
38.     }
39.     // state initialized, now do the real encryption
