libavcodec/mpegvideo.c:847: error: Uninitialized Value
  The value read from mb_array_size was never initialized.

libavcodec/mpegvideo.c:847:17: 
845.                                                 + s->mb_stride + 1;
846.                 }
847.                 FF_ALLOCZ_OR_GOTO(s->avctx, s->p_field_select_table[i],
                     ^
848.                                   mb_array_size * 2 * sizeof(uint8_t),
849.                                   fail);
