libavcodec/h264.c:2973: error: Uninitialized Value
  The value read from id_list[_] was never initialized.

libavcodec/h264.c:2973:13: 
2971.         ref2frm[1]= -1;
2972.         for(i=0; i<16; i++)
2973.             ref2frm[i+2]= 4*id_list[i]
                  ^
2974.                           + (h->ref_list[j][i].f.reference & 3);
2975.         ref2frm[18+0]=
