isnan_vec 1997 libswscale/utils.c if (isnan_vec(filter->chrH) || isnan_vec 1998 libswscale/utils.c isnan_vec(filter->chrV) || isnan_vec 1999 libswscale/utils.c isnan_vec(filter->lumH) || isnan_vec 2000 libswscale/utils.c isnan_vec(filter->lumV))