av_next_option    420 libavutil/opt.h attribute_deprecated const AVOption *av_next_option(FF_CONST_AVUTIL55 void *obj, const AVOption *last);
av_next_option     71 tools/enum_options.c         while ((u = av_next_option(&class, u)))
av_next_option     83 tools/enum_options.c     while ((o = av_next_option(&class, o)))