VAR_S2R_MAIN_W    191 libavfilter/vf_scale.c         (vars_w[VAR_S2R_MAIN_W]    || vars_h[VAR_S2R_MAIN_W]    ||
VAR_S2R_MAIN_W    440 libavfilter/vf_scale.c         scale->var_values[VAR_S2R_MAIN_W] = main_link->w;