libavcodec/ac3dec.c:392: error: Uninitialized Value
  The value read from dexp[_] was never initialized.

libavcodec/ac3dec.c:392:9: 
390.     prevexp = absexp;
391.     for(i=0,j=0; i<ngrps*3; i++) {
392.         prevexp += dexp[i] - 2;
             ^
393.         if (prevexp > 24U)
394.             return -1;
