[vdr] Re: DVB-T and channels.conf
Marcel Wiesweg
marcel.wiesweg at gmx.de
Wed Jun 22 20:57:11 CEST 2005
Am Sonntag 19 Juni 2005 13:17 schrieb Rainer Zocholl:
> marcel.wiesweg at gmx.de(Marcel Wiesweg) 18.06.05 23:29
>
> >> Example:
> >>
> >> VOX;RTL
> >> World:666000:I0C23D0M16B8T8G8Y0:T:27500:545:546=deu:551:0:16418:8468
> >>
> >> :8706:0 VOX;RTL World:666000:I0C23D0M16B8T8G8Y0:T:27500:0:0:0:0:1641
> >>
> >> 8:8468:2818:0
> >>
> >> Any usefull step to narrow the problem?
> >
> >If the pragmatical solution (new channels.conf) does not work, you
> >might want to analyze the relevant SI information:
> >Install dvbsnoop. For command line options, read their examples list.
> >Retrieve the PAT at PID 0x00.
> >Retrieve the PMT for VOX at the PID given by the PAT.
>
> How to do that?
>
> >Read the EITs at PID 0x12 and find the one for VOX. Look at the
> >service ID it refers to.
>
> msi:~/video# dvbsnoop -crc -sync -demux /dev/dvb/adapter3/demux0 -dvr
> /dev/dvb/adapter3/dvr0 -frontend /dev/dvb/adapter3/frontend0 16 dvbsnoop
> V1.3.35 -- http://dvbsnoop.sourceforge.net/
>
> ----------------------------------------------------------
> SECT-Packet: 00000001 PID: 16 (0x0010), Length: 67 (0x0043)
> Time received: Sun 2005-06-19 13:11:20.046
> ----------------------------------------------------------
> 0000: 40 f0 40 30 0b c7 00 00 f0 0b 40 09 54 2d 53 79
> @. at 0......@.T-Sy 0010: 73 74 65 6d 73 f0 28 0b 02 21 14 f0 22 41 0c 40
> stems.(..!.."A.@ 0020: 15 01 40 16 01 40 1b 01 40 22 01 5a 0b 03 bb 33
> .. at ..@..@".Z...3 0030: 40 1f 41 1b ff ff ff ff 62 05 ff 03 f8 3c 40 5f
> @.A.....b....<@_ 0040: 7e 37 21
> ~7!
>
> PID: 16 (0x0010)
> NIT-decoding....
> Table_ID: 64 (0x40) [= Network Information Table (NIT) - actual network]
> section_syntax_indicator: 1 (0x01)
> reserved_1: 1 (0x01)
> reserved_2: 3 (0x03)
> Section_length: 64 (0x0040)
> Network_ID: 12299 (0x300b) [= --> please lookup at http://www.dvb.org]
> reserved_3: 3 (0x03)
> Version_number: 3 (0x03)
> current_next_indicator: 1 (0x01) [= valid now]
> Section_number: 0 (0x00)
> Last_Section_number: 0 (0x00)
> reserved_4: 15 (0x0f)
> Network_descriptor_length: 11 (0x000b)
>
> DVB-DescriptorTag: 64 (0x40) [= network_name_descriptor]
> Descriptor_length: 9 (0x09)
> Network_name: "T-Systems" -- Charset: Latin alphabet
>
>
> reserved_5: 15 (0x0f)
> Transport_stream_loop_length: 40 (0x0028)
>
> Transport_stream_ID: 2818 (0x0b02)
> Original_network_ID: 8468 (0x2114) [= German Digital Terrestrial
> Television | IRT on behalf of the German DVB-T broadcasts] reserved_1: 15
> (0x0f)
> Transport_descriptor_length: 34 (0x0022)
>
> DVB-DescriptorTag: 65 (0x41) [= service_list_descriptor]
> Descriptor_length: 12 (0x0c)
> Service_ID: 16405 (0x4015) [= --> refers to PMT
> program_number] Service_type: 1 (0x01) [= digital television service]
>
> Service_ID: 16406 (0x4016) [= --> refers to PMT
> program_number] Service_type: 1 (0x01) [= digital television service]
>
> Service_ID: 16411 (0x401b) [= --> refers to PMT
> program_number] Service_type: 1 (0x01) [= digital television service]
>
> Service_ID: 16418 (0x4022) [= --> refers to PMT
> program_number] Service_type: 1 (0x01) [= digital television service]
>
>
> DVB-DescriptorTag: 90 (0x5a) [=
> terrestrial_delivery_system_descriptor] Descriptor_length: 11 (0x0b)
> Center frequency: 0x03bb3340 (= 626000.000 kHz)
> Bandwidth: 0 (0x00) [= 8 MHz]
> reserved_1: 31 (0x1f)
> Constellation: 1 (0x01) [= 16-QAM]
> Hierarchy information: 0 (0x00) [= non-hierarchical]
> Code_rate_HP_stream: 1 (0x01) [= 2/3]
> Code_rate_LP_stream: 0 (0x00) [= 1/2]
> Guard_interval: 3 (0x03) [= 1/4]
> Transmission_mode: 1 (0x01) [= 8k mode]
> Other_frequency_flag: 1 (0x01)
> reserved_2: 4294967295 (0xffffffff)
>
> DVB-DescriptorTag: 98 (0x62) [= frequency_list_descriptor]
> Descriptor_length: 5 (0x05)
> reserved_1: 63 (0x3f)
> coding_type: 3 (0x03) [= terrestrial]
> Centre_frequency: 03f83c40 (= 666000.000 kHz)
>
> CRC: 1602107169 (0x5f7e3721)
> ==========================================================
>
> msi:~/video# dvbsnoop -crc -sync -demux /dev/dvb/adapter3/demux0 -dvr
> /dev/dvb/adapter3/dvr0 -frontend /dev/dvb/adapter3/frontend0 0 dvbsnoop
> V1.3.35 -- http://dvbsnoop.sourceforge.net/
>
> ----------------------------------------------------------
> SECT-Packet: 00000001 PID: 0 (0x0000), Length: 32 (0x0020)
> Time received: Sun 2005-06-19 13:14:53.230
> ----------------------------------------------------------
> 0000: 00 b0 1d 0b 02 c5 00 00 00 00 e0 10 40 15 e1 50
> ............ at ..P 0010: 40 16 e1 60 40 1b e1 70 40 22 e2 20 c1 cd d7 05
> @..`@..p@". ....
>
> PID: 0 (0x0000)
> PAT-decoding....
> Table_ID: 0 (0x00) [= Program Association Table (PAT)]
> section_syntax_indicator: 1 (0x01)
> (fixed): 0 (0x00)
> reserved_1: 3 (0x03)
> Section_length: 29 (0x001d)
> Transport_Stream_ID: 2818 (0x0b02)
> reserved_2: 3 (0x03)
> Version_number: 2 (0x02)
> current_next_indicator: 1 (0x01) [= valid now]
> Section_number: 0 (0x00)
> Last_Section_number: 0 (0x00)
>
> Program_number: 0 (0x0000)
> reserved: 7 (0x07)
> Network_PID: 16 (0x0010)
>
> Program_number: 16405 (0x4015)
> reserved: 7 (0x07)
> Program_map_PID: 336 (0x0150)
>
> Program_number: 16406 (0x4016)
> reserved: 7 (0x07)
> Program_map_PID: 352 (0x0160)
>
> Program_number: 16411 (0x401b)
> reserved: 7 (0x07)
> Program_map_PID: 368 (0x0170)
>
> Program_number: 16418 (0x4022)
> reserved: 7 (0x07)
> Program_map_PID: 544 (0x0220)
>
> CRC: 3251492613 (0xc1cdd705)
> ==========================================================
>
>
> PID found: 0 (0x0000) [SECTION: Program Association Table (PAT)]
> PID found: 16 (0x0010) [SECTION: Network Information Table (NIT) -
> actual network] PID found: 18 (0x0012) [SECTION: Event Information Table
> (EIT) - actual transport stream, schedule] PID found: 20 (0x0014)
> [SECTION: Time Date Table (TDT)] scanning pid 0x0017 to 0x002a (got 20
> dmx filters)
>
> Where is a list of the PIDs? Or what is the number of "PMT"?
Sorry for the late response, but I haven't had time this week (or had to watch
soccer).
dvbsnoop -n 1 0x0
gives you the PAT and a list of
Program_number: 28006 (0x6d66)
reserved: 7 (0x07)
Program_map_PID: 100 (0x0064)
Program_number is the Service ID of the channel, Program_map_PID is the PID
where the PMT is broadcast. So if the above was the channel you are looking
for, next is
dvbsnoop -n 1 100
which gives you the PMT, which is much longer. The output is formatted
hierarchically, only look at the first level. There you have a list of
Stream_type: 2 (0x02) [= ITU-T Rec. H.262 | ISO/IEC 13818-2 Video |
ISO/IEC 11172-2 constr. parameter video stream]
reserved_1: 7 (0x07)
Elementary_PID: 110 (0x006e)
reserved_2: 15 (0x0f)
ES_info_length: 6 (0x0006)
This is a video stream (Stream_type) which is broadcast on PID 110.
You will have audio, video and some other types of stream, but you are only
interested in audio and video.
Now you have a channel with a service ID, audio and video PIDs. See what is
broadcast for those service ID combinations for VOX.
dvbsnoop -n 100 0x12 | grep Service_ID | sort | uniq
lets you find out for which service IDs EPG info is broadcast on that
transponder.
The SDT from
dvbsnoop -n 1 0x11
gives you a list of
Service_id: 28007 (0x6d67) [= --> refers to PMT program_number]
reserved_1: 63 (0x3f)
EIT_schedule_flag: 1 (0x01)
EIT_present_following_flag: 1 (0x01)
Running_status: 4 (0x04) [= running]
Free_CA_mode: 0 (0x00) [= unscrambled]
Descriptors_loop_length: 46 (0x002e)
DVB-DescriptorTag: 72 (0x48) [= service_descriptor]
Descriptor_length: 18 (0x12)
service_type: 1 (0x01) [= digital television service]
service_provider_name_length: 10 (0x0a)
service_provider_name: "ZDFvision" --Charset: Latin alphabet no. 5
service_name_length: 5 (0x05)
Service_name: "3sat" -- Charset: Latin alphabet no. 5
where you find a Service_name (last line) for the Service_id.
If you have all this information, you can reconstruct what is actually
broadcast and compare it to what VDR makes of this.
Marcel
> Rainer---<=====> Vertraulich
> //
> //
> <=====>--------------ocholl, Kiel, Germany ------------
>
>
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