libavcodec/h264.c:2978: error: Uninitialized Value
  The value read from id_list[_] was never initialized.

libavcodec/h264.c:2978:13: 
2976.         ref2frm[18+1]= -1;
2977.         for(i=16; i<48; i++)
2978.             ref2frm[i+4]= 4*id_list[(i-16)>>1]
                  ^
2979.                           + (h->ref_list[j][i].f.reference & 3);
2980.     }
