libavcodec/motion_est_template.c:890: error: Uninitialized Value
  The value read from ymin was never initialized.

libavcodec/motion_est_template.c:890:9: 
888.         CHECK_MV(best[0]-1, best[1])
889.         CHECK_MV(best[0]+1, best[1])
890.         CHECK_MV(best[0], best[1]-1)
             ^
891.         CHECK_MV(best[0], best[1]+1)
892.     }
