libavcodec/h264_slice.c:1664: error: Uninitialized Value
  The value read from id_list[_] was never initialized.

libavcodec/h264_slice.c:1664:13: 
1662.         ref2frm[1] = -1;
1663.         for (i = 0; i < 16; i++)
1664.             ref2frm[i + 2] = 4 * id_list[i] + (sl->ref_list[j][i].reference & 3);
                  ^
1665.         ref2frm[18 + 0] =
1666.         ref2frm[18 + 1] = -1;
