libavcodec/mpegvideo.c:881: error: Uninitialized Value
  The value read from mb_array_size was never initialized.

libavcodec/mpegvideo.c:881:9: 
879. 
880.         /* init macroblock skip table */
881.         FF_ALLOCZ_OR_GOTO(s->avctx, s->mbskip_table, mb_array_size + 2, fail);
             ^
882.         // Note the + 1 is for  a quicker mpeg4 slice_end detection
883.         FF_ALLOCZ_OR_GOTO(s->avctx, s->prev_pict_types,
