libavcodec/motion_est_template.c:803: error: Uninitialized Value
  The value read from ymin was never initialized.

libavcodec/motion_est_template.c:803:5: 
801.     y= best[1];
802.     d= dmin;
803.     CHECK_CLIPPED_MV(x  , y);
         ^
804.     CHECK_CLIPPED_MV(x+1, y);
805.     CHECK_CLIPPED_MV(x, y+1);
