void show_help_children(const AVClass *class, int flags)
{
const AVClass *child = NULL;
- av_opt_show2(&class, NULL, flags, 0);
- printf("\n");
+ if (class->option) {
+ av_opt_show2(&class, NULL, flags, 0);
+ printf("\n");
+ }
while (child = av_opt_child_class_next(class, child))
show_help_children(child, flags);