Baidu Inc, owner of China's dominant search engine, said revenue growth for its online video service iQiyi more than doubled in the fourth quarter and for the whole of 2014.

Chief Executive Robin Li did not give a specific figure. He was speaking on a call to analysts after Baidu reported a lower-than-expected 47.5 percent rise in quarterly revenue.

Shares of the U.S.-listed company fell 9.3 percent to $194.70 in extended trading after markets closed on Wednesday in New York.