libavcodec/motion_est_template.c:724: error: Uninitialized Value
  The value read from ymin was never initialized.

libavcodec/motion_est_template.c:724:5: 
722.     x= best[0];
723.     y= best[1];
724.     CHECK_CLIPPED_MV(x+1, y);
         ^
725.     CHECK_CLIPPED_MV(x, y+1);
726.     CHECK_CLIPPED_MV(x-1, y);
