INTERLACE_TYPE_T  253 libavfilter/f_select.c     select->var_values[VAR_INTERLACE_TYPE_T] = INTERLACE_TYPE_T;
INTERLACE_TYPE_T  357 libavfilter/f_select.c         frame->top_field_first ? INTERLACE_TYPE_T : INTERLACE_TYPE_B;