libavcodec/motion_est_template.c:215: error: Uninitialized Value
  The value read from ymax was never initialized.

libavcodec/motion_est_template.c:215:9: 
213.             CHECK_HALF_MV(0, 1, mx  , my)
214.         }
215.         assert(bx >= xmin*2 && bx <= xmax*2 && by >= ymin*2 && by <= ymax*2);
             ^
216.     }
217. 
