libavcodec/dvdsubenc.c:129: error: Uninitialized Value
  The value read from hist[_] was never initialized.

libavcodec/dvdsubenc.c:129:9: 
127.         if (color == 0)
128.             color = 3;
129.         av_log(NULL, AV_LOG_DEBUG, "dvd_subtitle hist[%d]=%ld -> col %d\n",
             ^
130.                imax, hist[imax], color);
131.         cmap[imax] = color;
