libavcodec/dvdsubenc.c:123: error: Uninitialized Value
  The value read from hist[_] was never initialized.

libavcodec/dvdsubenc.c:123:17: 
121.             if (hist[i] > hmax) {
122.                 imax = i;
123.                 hmax = hist[i];
                     ^
124.             }
125.         if (hmax == 0)
