VARS_NB           118 libavfilter/vf_aspect.c     double var_values[VARS_NB], res;
VARS_NB           142 libavfilter/vf_boxblur.c     double var_values[VARS_NB], res;
VARS_NB           125 libavfilter/vf_drawbox.c     double var_values[VARS_NB], res;
VARS_NB           100 libavfilter/vf_pad.c     double var_values[VARS_NB], res;
VARS_NB           243 libavfilter/vf_scale.c     double var_values[VARS_NB], res;
VARS_NB           128 libavfilter/vf_zoompan.c     double var_values[VARS_NB], nb_frames, zoom, dx, dy;