libavcodec/mpegvideo.c:858: error: Uninitialized Value
  The value read from mb_array_size was never initialized.

libavcodec/mpegvideo.c:858:13: 
856. 
857.             /* cbp, ac_pred, pred_dir */
858.             FF_ALLOCZ_OR_GOTO(s->avctx, s->cbp_table,
                 ^
859.                               mb_array_size * sizeof(uint8_t), fail);
860.             FF_ALLOCZ_OR_GOTO(s->avctx, s->pred_dir_table,
