libavcodec/motion_est_template.c:1170: error: Uninitialized Value
  The value read from ymin was never initialized.

libavcodec/motion_est_template.c:1170:9: 
1168.         CHECK_MV(P_TOP[0]>>shift, P_TOP[1]>>shift)
1169.         CHECK_MV(P_TOPRIGHT[0]>>shift, P_TOPRIGHT[1]>>shift)
1170.         CHECK_CLIPPED_MV((last_mv[ref_mv_xy][0]*ref_mv_scale + (1<<15))>>16,
              ^
1171.                         (last_mv[ref_mv_xy][1]*ref_mv_scale + (1<<15))>>16)
1172.     }
