libavcodec/motion_est_template.c:485: error: Uninitialized Value
  The value read from ymin was never initialized.

libavcodec/motion_est_template.c:485:9: 
483.         CHECK_QUARTER_MV(1, 0, mx-1, my  )
484. #endif
485.         assert(bx >= xmin*4 && bx <= xmax*4 && by >= ymin*4 && by <= ymax*4);
             ^
486. 
487.         *mx_ptr = bx;
