libavcodec/ps.c:1041: error: Uninitialized Value
  The value read from h21i was never initialized.

libavcodec/ps.c:1041:17: 
1039.                 h11i += h11i_step;
1040.                 h12i += h12i_step;
1041.                 h21i += h21i_step;
                      ^
1042.                 h22i += h22i_step;
1043. 
