[kiklop74]

Originally Posted by pubolab

Looks like calibre did not do GB2312 to UTF8 conversion.

Calibre does not detect always correctly the native encoding. It is better to supply it manually. Use encoding parameter in your recipe for this.

encoding = 'gb2312'

See here the list of valid encoding names in python
http://docs.python.org/library/codecs.html

Originally Posted by pubolab

Is there a complete reference manual of the recipe syntax and commands?

Of course look here http://calibre.kovidgoyal.net/user_manual/news.html