VAR_PREV_SELECTED_PTS  233 libavfilter/f_select.c     select->var_values[VAR_PREV_SELECTED_PTS] = NAN;
VAR_PREV_SELECTED_PTS  404 libavfilter/f_select.c         select->var_values[VAR_PREV_SELECTED_PTS] = select->var_values[VAR_PTS];