static int set_demux(int dmxfd, int pid, int pes_type, int dvr)
{
    struct dmx_pes_filter_params pesfilter;

    if (pid <= 0 || pid >= 0x1fff) /* ignore this pid to allow radio services */
        return TRUE;

    if (dvr) {
        int buffersize = 64 * 1024;
        if (ioctl(dmxfd, DMX_SET_BUFFER_SIZE, buffersize) == -1)
            perror("DMX_SET_BUFFER_SIZE failed");
    }

    pesfilter.pid = pid;
    pesfilter.input = DMX_IN_FRONTEND;
    pesfilter.output = dvr ? DMX_OUT_TS_TAP : DMX_OUT_DECODER;
    pesfilter.pes_type = pes_type; //audio ? DMX_PES_AUDIO : DMX_PES_VIDEO;
    pesfilter.flags = DMX_IMMEDIATE_START;

    if (ioctl(dmxfd, DMX_SET_PES_FILTER, &pesfilter) == -1) {
        fprintf(stderr, "DMX_SET_PES_FILTER failed "
                "(PID = 0x%04x): %d %m\n", pid, errno);
        return FALSE;
    }

    return TRUE;
}