libavcodec/h264.c:1086: error: Uninitialized Value
  The value read from ref[_] was never initialized.

libavcodec/h264.c:1086:24: 
1084.                     if(ref[0] > 0)
1085.                         a= pack16to32(mv[0][0],mv[0][1]);
1086.                     if(ref[1] > 0)
                             ^
1087.                         b= pack16to32(mv[1][0],mv[1][1]);
1088.                 }else{
