libavcodec/cavsdec.c:352: error: Uninitialized Value
  The value read from sub_type[_] was never initialized.

libavcodec/cavsdec.c:352:13: 
350.                                    &h->col_mv[h->mbidx*4 + block]);
351.                 break;
352.             case B_SUB_FWD:
                 ^
353.                 ff_cavs_mv(h, mv_scan[block], mv_scan[block]-3,
354.                         MV_PRED_MEDIAN, BLK_8X8, 1);
