libavcodec/cavsdec.c:340: error: Uninitialized Value
  The value read from sub_type[_] was never initialized.

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