libavcodec/dvdsubenc.c:128: error: Uninitialized Value
  The value read from hist[_] was never initialized.

libavcodec/dvdsubenc.c:128:13: 
126.             // only count non-transparent pixels
127.             alpha = ((uint32_t *)h->rects[object_id]->data[1])[color] >> 24;
128.             hist[color] += alpha;
                 ^
129.         }
130.     }
