libavcodec/vorbis_dec.c:1572: error: Uninitialized Value
  The value read from res_chan[_] was never initialized.

libavcodec/vorbis_dec.c:1572:9: 
1570.         float *mag, *ang;
1571. 
1572.         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
              ^
1573.         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;
1574.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
