libavcodec/motion_est_template.c:683: error: Uninitialized Value
  The value read from ymin was never initialized.

libavcodec/motion_est_template.c:683:13: 
681.             CHECK_CLIPPED_MV(x+  dia_size    , y);
682.             CHECK_CLIPPED_MV(x+( dia_size>>1), y+dia_size);
683.             CHECK_CLIPPED_MV(x+( dia_size>>1), y-dia_size);
                 ^
684.             if(dia_size>1){
685.                 CHECK_CLIPPED_MV(x+(-dia_size>>1), y+dia_size);
