libavcodec/mpegvideo.c:626: error: Uninitialized Value
  The value read from mb_array_size was never initialized.

libavcodec/mpegvideo.c:626:17: 
624.                     s->p_field_mv_table[i][j] = s->p_field_mv_table_base[i][j]+ s->mb_stride + 1;
625.                 }
626.                 FF_ALLOCZ_OR_GOTO(s->avctx, s->p_field_select_table[i], mb_array_size * 2 * sizeof(uint8_t), fail)
                     ^
627.             }
628.         }
