Mine

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;}