av_set_number     219 libavcodec/opt.c     return av_set_number(obj, name, n, 1, 1);
av_set_number     223 libavcodec/opt.c     return av_set_number(obj, name, n.num, n.den, 1);
av_set_number     227 libavcodec/opt.c     return av_set_number(obj, name, 1, 1, n);