libavcodec/mpegvideo.c:838: error: Uninitialized Value
  The value read from mb_array_size was never initialized.

libavcodec/mpegvideo.c:838:21: 
836.                                                        s->mb_stride + 1;
837.                     }
838.                     FF_ALLOCZ_OR_GOTO(s->avctx, s->b_field_select_table [i][j],
                         ^
839.                                       mb_array_size * 2 * sizeof(uint8_t),
840.                                       fail);
