libavcodec/ffv1.c:269: error: Uninitialized Value
  The value read from best_len[_] was never initialized.

libavcodec/ffv1.c:269:21: 
267.                                         (1 - p) * l2tab[256 - m]);
268.                     }
269.                 if (len < best_len[k]) {
                         ^
270.                     best_len[k]      = len;
271.                     best_state[i][k] = j;
