libavcodec/cavsdec.c:363: error: Uninitialized Value
  The value read from sub_type[_] was never initialized.

libavcodec/cavsdec.c:363:16: 
361.         }
362.         for(block=0;block<4;block++) {
363.             if(sub_type[block] == B_SUB_BWD)
                    ^
364.                 ff_cavs_mv(h, mv_scan[block]+MV_BWD_OFFS,
365.                         mv_scan[block]+MV_BWD_OFFS-3,
