[mythtv] DVB-T scan problem with MythTV SVN (r9944)

[Aidan Thornton]

> From:: "Aidan Thornton" <makomk at lycos.co.uk>
> To: mythtv-dev at mythtv.org
> Subject: [mythtv] DVB-T scan problem with MythTV SVN (r9944)
> Date: Sat, 20 May 2006 16:06:40 +0000 (GMT)

> Hi,
> I tried scanning for DVB-T channels on my HVR-900 (em2880_dvb driver) using
> MythTV SVN r9944. It found the channels and muxes and added them, however
> it also added 6 transports with bogus frequencies (2147483647 Hz) and all
> the channels seem to be associated with them. I'm in the UK, Waltham
> transmitter, and my (correct) dvbscan-generated channels.conf and a dump of
> my dtv_multiplex table are attached.
> I'm not sure how far back this problem goes - I only just started using
> MythTV SVN. (0.19-fixes doesn't work with this driver - the signal
> detection code doesn't like it.) Note that I'm almost certainly the first
> person to use MythTV with the em2880_dvb driver (I had to fix it to get
> MythTV to work at all), which might complicate things slightly.
> Could someone have a look at this?
> Thanks,
> -- Aidan Thornton


Oh, and I just spotted the following interesting lines in the output of "mythtv-setup -v siparser,channels" when scanning for channels (I hope LycosMail doesn't mangle this). None of the frequencies listed in relation to the NIT seem to bear any resemblence to either the actual frequencies of DVB-T on the transmitter or the frequencies of the multiplexes/transports added using insert_dtv_multiplex:


2006-05-20 17:19:58.348 SIScan(0): NIT: NetID(12297) tranports(6)
Network descriptors length: 9
  NetworkNameDescriptor: Waltham
  Transport # 0 TSID(0x1006) original_network_id(0x233a) desc_len(72)
  Transport descriptors length: 72
    Service List Descriptor (0x41) length(18)
    TerrestrialDeliverySystemDescriptor(stub)
    FrequencyListDescriptor: frequencies:  61800000
    Private Data Specifier Descriptor (0x5f) length(4)
    Possibly a DVB UK Channel List Descriptor (0x83) length(24)
  Transport # 1 TSID(0x2008) original_network_id(0x233a) desc_len(124)
  Transport descriptors length: 124
    Service List Descriptor (0x41) length(42)
    TerrestrialDeliverySystemDescriptor(stub)
    FrequencyListDescriptor: frequencies:  84200000
    Private Data Specifier Descriptor (0x5f) length(4)
    Possibly a DVB UK Channel List Descriptor (0x83) length(52)
  Transport # 2 TSID(0x3002) original_network_id(0x233a) desc_len(219)
  Transport descriptors length: 219
    Service List Descriptor (0x41) length(81)
    TerrestrialDeliverySystemDescriptor(stub)
    FrequencyListDescriptor: frequencies:  73000000
    Private Data Specifier Descriptor (0x5f) length(4)
    Possibly a DVB UK Channel List Descriptor (0x83) length(108)
  Transport # 3 TSID(0x4000) original_network_id(0x233a) desc_len(121)
  Transport descriptors length: 121
    Service List Descriptor (0x41) length(39)
    TerrestrialDeliverySystemDescriptor(stub)
    FrequencyListDescriptor: frequencies:  81000000
    Private Data Specifier Descriptor (0x5f) length(4)
    Possibly a DVB UK Channel List Descriptor (0x83) length(52)
  Transport # 4 TSID(0x5000) original_network_id(0x233a) desc_len(100)
  Transport descriptors length: 100
    Service List Descriptor (0x41) length(30)
    TerrestrialDeliverySystemDescriptor(stub)
    FrequencyListDescriptor: frequencies:  53800000
    Private Data Specifier Descriptor (0x5f) length(4)
    Possibly a DVB UK Channel List Descriptor (0x83) length(40)
  Transport # 5 TSID(0x6000) original_network_id(0x233a) desc_len(156)
  Transport descriptors length: 156
    Service List Descriptor (0x41) length(54)
    TerrestrialDeliverySystemDescriptor(stub)
    FrequencyListDescriptor: frequencies:  77800000
    Private Data Specifier Descriptor (0x5f) length(4)
    Possibly a DVB UK Channel List Descriptor (0x83) length(72)

2006-05-20 17:19:58.352 insert_dtv_multiplex(3, dvb, 4294967295, ...)
2006-05-20 17:19:58.353 insert_dtv_multiplex -- insert 0
2006-05-20 17:19:58.354 insert_dtv_multiplex -- inserted 43
2006-05-20 17:19:58.355 insert_dtv_multiplex(3, dvb, 4294967295, ...)
2006-05-20 17:19:58.356 insert_dtv_multiplex -- insert 0
2006-05-20 17:19:58.358 insert_dtv_multiplex -- inserted 44
2006-05-20 17:19:58.359 insert_dtv_multiplex(3, dvb, 4294967295, ...)
2006-05-20 17:19:58.359 insert_dtv_multiplex -- insert 0
2006-05-20 17:19:58.361 insert_dtv_multiplex -- inserted 45
2006-05-20 17:19:58.361 insert_dtv_multiplex(3, dvb, 4294967295, ...)
2006-05-20 17:19:58.362 insert_dtv_multiplex -- insert 0
2006-05-20 17:19:58.363 insert_dtv_multiplex -- inserted 46
2006-05-20 17:19:58.364 insert_dtv_multiplex(3, dvb, 4294967295, ...)
2006-05-20 17:19:58.366 insert_dtv_multiplex -- insert 0
2006-05-20 17:19:58.367 insert_dtv_multiplex -- inserted 47
2006-05-20 17:19:58.368 insert_dtv_multiplex(3, dvb, 4294967295, ...)
2006-05-20 17:19:58.369 insert_dtv_multiplex -- insert 0
2006-05-20 17:19:58.370 insert_dtv_multiplex -- inserted 48
2006-05-20 17:19:58.371 Created 6 multiplexes from NIT

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