libavcodec/h264.c:1106: error: Uninitialized Value
  The value read from ref[_] was never initialized.

libavcodec/h264.c:1106:20: 
1104.                 if(ref[0] > 0)
1105.                     a= pack16to32(mv[0][0],mv[0][1]);
1106.                 if(ref[1] > 0)
                         ^
1107.                     b= pack16to32(mv[1][0],mv[1][1]);
1108.             }else{
