libavcodec/h264_direct.c:290: error: Uninitialized Value
  The value read from ref[_] was never initialized.

libavcodec/h264_direct.c:290:24: 
288.                        || (l1ref0[xy8]  < 0 && l1ref1[xy8] == 0 && FFABS(l1mv1[xy4][0]) <= 1 && FFABS(l1mv1[xy4][1]) <= 1))){
289.                     a=b=0;
290.                     if(ref[0] > 0)
                            ^
291.                         a= pack16to32(mv[0][0],mv[0][1]);
292.                     if(ref[1] > 0)
