[linux-dvb] HDTV tuning.

Christophe Thommeret hftom at free.fr
Tue Sep 26 21:20:54 CEST 2006


Le Mardi 26 Septembre 2006 21:03, Mario Rossi a écrit :
> Hi
>
> how should I interpret the output of scan, trying to scan for HDTV in
> London?
>
> initial scan file
>
> T 554000000 8MHz 2/3 2/3  QAM64  8k 1/32 NONE
>
> (I had found those values in this mailing list some months ago)
>
> output:
>
> scanning /opt/dvb/uk-CrystalPalace
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> initial transponder 554000000 0 2 2 3 1 0 0
>
> >>> tune to:
> >>> 554000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_2_3:QAM_64:TRANSMI
> >>>SSION_MODE_8K:GUARD_INTERVAL_1_32:HIERARCHY_NONE tuning status == 0x0f
> >>> tuning status == 0x1f
>
> PAT
> PMT 0x0258 for service 0x9044
> SDT (actual TS)
> 0x0000 0x9044: pmt_pid 0x0258 BBC -- BBC HD1 (running)
> NIT (actual TS)
> Network Name 'Crystal Palace B'
>
> >>> tune to:
> >>> 554167000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMI
> >>>SSION_MODE_8K:GUARD_INTERVAL_1_32:HIERARCHY_NONE tuning status == 0x07
> >>> tuning status == 0x1f
>
> PAT
> PMT 0x0258 for service 0x9044
> SDT (actual TS)
> 0x9004 0x9044: pmt_pid 0x0258 BBC -- BBC HD1 (running)
> NIT (actual TS)
> Network Name 'Crystal Palace B'
>
> >>> tune to:
> >>> 522167000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QPSK:TRANSMISS
> >>>ION_MODE_8K:GUARD_INTERVAL_1_32:HIERARCHY_NONE tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
>
> WARNING: >>> tuning failed!!!
>
> >>> tune to:
> >>> 522167000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QPSK:TRANSMISS
> >>>ION_MODE_8K:GUARD_INTERVAL_1_32:HIERARCHY_NONE
>
> (tuning failed)
>
> >>> tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
> >>> tuning status == 0x05
>
> WARNING: >>> tuning failed!!!
> dumping lists (2 services)
> BBC
> HD1:554000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_2_3:QAM_64:TRANSMI
>SSION_MODE_8K:GUARD_INTERVAL_1_32:HIERARCHY_NONE:0:0:36932 BBC
> HD1:554167000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMI
>SSION_MODE_8K:GUARD_INTERVAL_1_32:HIERARCHY_NONE:0:0:36932 Done.
>
> Whet it says "WARNING: tuning failed" what does it mean?

It means "tuning failed" :)

> Where does it get the frequency 522167000?

From the Network Information Table (NIT) that is supposed to give a list of 
available mplex on that network.

> If it is given by the initial trasponder, why is it empty?

Well, NIT with wrong/outdated infos are very common through all networks 
(s,c,t) ;)

-- 
Christophe Thommeret



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