if(s->msmpeg4_version != 4){
if(s->msmpeg4_version < 4){
static inline void handle_slices(MpegEncContext *s){    if (s->mb_x == 0) {        if (s->slice_height && (s->mb_y % s->slice_height) == 0) {            if(s->msmpeg4_version != 4){                ff_mpeg4_clean_buffers(s);            }            s->first_slice_line = 1;        } else {            s->first_slice_line = 0;         }    }}