VAR_S2R_MAIN_T    200 libavfilter/vf_scale.c          vars_w[VAR_S2R_MAIN_T]    || vars_h[VAR_S2R_MAIN_T]    ||
VAR_S2R_MAIN_T    211 libavfilter/vf_scale.c          vars_w[VAR_S2R_MAIN_T]   || vars_h[VAR_S2R_MAIN_T]  ||
VAR_S2R_MAIN_T    705 libavfilter/vf_scale.c             scale->var_values[VAR_S2R_MAIN_T] = TS2T(in->pts, link->time_base);