libavcodec/ps.c:955: error: Uninitialized Value
  The value read from h21i was never initialized.

libavcodec/ps.c:955:21: 
953.                     h11i += h11i_step;
954.                     h12i += h12i_step;
955.                     h21i += h21i_step;
                         ^
956.                     h22i += h22i_step;
957. 
