static int64_t get_pts(const char *buf, int *duration)

{

    int i, hour, min, sec, hsec;

    int he, me, se, mse;



    for (i=0; i<2; i++) {

        int64_t start, end;

        if (sscanf(buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",

                   &hour, &min, &sec, &hsec, &he, &me, &se, &mse) == 8) {

            min += 60*hour;

            sec += 60*min;

            start = sec*1000+hsec;

            me += 60*he;

            se += 60*me;

            end = se*1000+mse;

            *duration = end - start;

            return start;

        }

        buf += strcspn(buf, "\n") + 1;

    }

    return AV_NOPTS_VALUE;

}
