jpeg output format

I‘m using the lib in the c64xplus_jpegenc_02_00_01_00_production,when I choose the infut format is XDM_YUV_422ILE,the output format is XDM_CHROMAFORMAT_DEFAULT,I find that the jpeg encoder will return error.I want to know whether the XDM_CHROMAFORMAT_DEFAULT equal to 0,and whether the input and the output format is not match.