libavcodec/vorbis_dec.c:1581: error: Uninitialized Value
  The value read from res_chan[_] was never initialized.

libavcodec/vorbis_dec.c:1581:9: 
1579.     for (j = vc->audio_channels-1;j >= 0; j--) {
1580.         ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;
1581.         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;
              ^
1582.         vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize / 2);
1583.         ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);
