void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance)
{
    int ist1, ist2;
    int64_t pos_delta = 0;
    //We could use URLProtocol flags here but as many user applications do not use URLProtocols this would be unreliable
    const char *proto = avio_find_protocol_name(s->filename);

    if (!(strcmp(proto, "file") && strcmp(proto, "pipe") && strcmp(proto, "cache")))
        return;

    for (ist1 = 0; ist1 < s->nb_streams; ist1++) {
        AVStream *st1 = s->streams[ist1];
        for (ist2 = 0; ist2 < s->nb_streams; ist2++) {
            AVStream *st2 = s->streams[ist2];
            int i1, i2;

            if (ist1 == ist2)
                continue;

            for (i1 = i2 = 0; i1 < st1->nb_index_entries; i1++) {
                AVIndexEntry *e1 = &st1->index_entries[i1];
                int64_t e1_pts = av_rescale_q(e1->timestamp, st1->time_base, AV_TIME_BASE_Q);

                for (; i2 < st2->nb_index_entries; i2++) {
                    AVIndexEntry *e2 = &st2->index_entries[i2];
                    int64_t e2_pts = av_rescale_q(e2->timestamp, st2->time_base, AV_TIME_BASE_Q);
                    if (e2_pts - e1_pts < time_tolerance)
                        continue;
                    pos_delta = FFMAX(pos_delta, e1->pos - e2->pos);
                    break;
                }
            }
        }
    }

    pos_delta *= 2;
    /* XXX This could be adjusted depending on protocol*/
    if (s->pb->buffer_size < pos_delta && pos_delta < (1<<24)) {
        av_log(s, AV_LOG_VERBOSE, "Reconfiguring buffers to size %"PRId64"\n", pos_delta);
        ffio_set_buf_size(s->pb, pos_delta);
        s->pb->short_seek_threshold = FFMAX(s->pb->short_seek_threshold, pos_delta/2);
    }
}