libavcodec/dca.c:700: error: Uninitialized Value
  The value read from sum[_] was never initialized.

libavcodec/dca.c:700:13: 
698.         /* Store history */
699.         for (k = 0; k < 16; k++)
700.             subband_fir_hist[k] = cos_mod[j++] * sum[k];
                 ^
701.         for (k = 0; k < 16; k++)
702.             subband_fir_hist[32-k-1] = cos_mod[j++] * diff[k];
