static void mpeg4_encode_gop_header(MpegEncContext * s){

    int hours, minutes, seconds;

    int64_t time;



    put_bits(&s->pb, 16, 0);

    put_bits(&s->pb, 16, GOP_STARTCODE);



    time= s->current_picture_ptr->pts;

    if(s->reordered_input_picture[1])

        time= FFMIN(time, s->reordered_input_picture[1]->pts);

    time= time*s->avctx->time_base.num;



    seconds= time/s->avctx->time_base.den;

    minutes= seconds/60; seconds %= 60;

    hours= minutes/60; minutes %= 60;

    hours%=24;



    put_bits(&s->pb, 5, hours);

    put_bits(&s->pb, 6, minutes);

    put_bits(&s->pb, 1, 1);

    put_bits(&s->pb, 6, seconds);



    put_bits(&s->pb, 1, !!(s->flags&CODEC_FLAG_CLOSED_GOP));

    put_bits(&s->pb, 1, 0); 



    s->last_time_base= time / s->avctx->time_base.den;



    ff_mpeg4_stuffing(&s->pb);

}
