libavcodec/motion_est_template.c:807: error: Uninitialized Value
  The value read from ymin was never initialized.

libavcodec/motion_est_template.c:807:5: 
805.     CHECK_CLIPPED_MV(x, y+1);
806.     CHECK_CLIPPED_MV(x-1, y);
807.     CHECK_CLIPPED_MV(x, y-1);
         ^
808.     best[0]= x;
809.     best[1]= y;
