libavcodec/cavsdec.c:339: error: Uninitialized Value
  The value read from sub_type[_] was never initialized.

libavcodec/cavsdec.c:339:13: 
337.         for(block=0;block<4;block++) {
338.             switch(sub_type[block]) {
339.             case B_SUB_DIRECT:
                 ^
340.                 if(!(*h->col_type)) {
341.                     /* intra MB at co-location, do in-plane prediction */
