[x265] fixed default encoding mode


git-svn-id: http://svn.code.sf.net/p/megui/code@2423 a21b8521-4df1-4ed3-b48c-cff5bc73dcb3
[x265] fixed default encoding mode part II


git-svn-id: http://svn.code.sf.net/p/megui/code@2424 a21b8521-4df1-4ed3-b48c-cff5bc73dcb3