fov_from_dfov    3888 libavfilter/vf_v360.c         fov_from_dfov(s->in, s->id_fov, w, h, &s->ih_fov, &s->iv_fov);
fov_from_dfov    4185 libavfilter/vf_v360.c         fov_from_dfov(s->out, s->d_fov, w, h, &s->h_fov, &s->v_fov);