static AVStream * init_stream(AVFormatContext *s)

{

    BinDemuxContext *bin = s->priv_data;

    AVStream *st = avformat_new_stream(s, NULL);

    if (!st)

        return NULL;

    st->codec->codec_tag   = 0;

    st->codec->codec_type  = AVMEDIA_TYPE_VIDEO;



    if (!bin->width) {

        st->codec->width  = (80<<3);

        st->codec->height = (25<<4);

    }



    avpriv_set_pts_info(st, 60, bin->framerate.den, bin->framerate.num);



    /* simulate tty display speed */

    bin->chars_per_frame = FFMAX(av_q2d(st->time_base) * bin->chars_per_frame, 1);



    return st;

}
