[mythtv-users] How do you "tune" subchannels in QAM?
Marc Tousignant
drayson at net1plus.com
Fri Apr 1 19:03:51 UTC 2005
Taylor,
Guess I am wrong about it getting stuck on pid 0000
To answer question 1, Comcast in MA.
Had to download and build it but its working..
yggdrasil dvbsnoop # dvbsnoop 0x1FFB
dvbsnoop V1.3.85 -- http://dvbsnoop.sourceforge.net/
And it sits there forever, I let it run 5 mins, until I ctrl c
Dvbtransport shows nothing on 1ffb.
yggdrasil dvbsnoop # dvbtraffic
0000 3 p/s 0 kb/s 5 kbit
0030 19 p/s 3 kb/s 29 kbit
0031 19 p/s 3 kb/s 29 kbit
0800 9003 p/s 1652 kb/s 13541 kbit
0801 263 p/s 48 kb/s 395 kbit
0802 88 p/s 16 kb/s 133 kbit
0840 11043 p/s 2027 kb/s 16609 kbit
0841 263 p/s 48 kb/s 395 kbit
1fff 5071 p/s 931 kb/s 7627 kbit
2000 25778 p/s 4732 kb/s 38771 kbit
-PID--FREQ-----BANDWIDTH-BANDWIDTH-
I tried 1fff and it also sits there forever, also 5 mins.
Just for the hell of it I tried 0000
------------------------------------------------------------
SECT-Packet: 00000009 PID: 0 (0x0000), Length: 20 (0x0014)
Time received: Fri 2005-04-01 13:44:22.896
------------------------------------------------------------
0000: 00 b0 11 80 b6 c5 00 00 00 01 e0 30 00 02 e0 31 ...........0...1
0010: f8 3d 45 eb .=E.
PID: 0 (0x0000) [= assigned for: ISO 13818-1 Program Association Table
(PAT)]
Guess table from table id...
PAT-decoding....
Table_ID: 0 (0x00) [= Program Association Table (PAT)]
section_syntax_indicator: 1 (0x01)
(fixed): 0 (0x00)
reserved_1: 3 (0x03)
Section_length: 17 (0x0011)
Transport_Stream_ID: 32950 (0x80b6)
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: 1 (0x0001)
reserved: 7 (0x07)
Program_map_PID: 48 (0x0030)
Program_number: 2 (0x0002)
reserved: 7 (0x07)
Program_map_PID: 49 (0x0031)
CRC: 4164765163 (0xf83d45eb)
==========================================================
I also tried 0030
------------------------------------------------------------
SECT-Packet: 00000205 PID: 48 (0x0030), Length: 87 (0x0057)
Time received: Fri 2005-04-01 13:40:47.178
------------------------------------------------------------
0000: 02 b0 54 00 01 c9 00 00 e8 00 f0 00 02 e8 00 f0 ..T.............
0010: 12 06 01 02 86 0d e2 65 6e 67 7e 3f ff 65 6e 67 .......eng~?.eng
0020: c1 3f ff 81 e8 01 f0 13 05 04 41 43 2d 33 0a 04 .?........AC-3..
0030: 65 6e 67 00 81 05 08 b8 1b 09 1f 81 e8 02 f0 13 eng.............
0040: 05 04 41 43 2d 33 0a 04 65 6e 67 00 81 05 08 a9 ..AC-3..eng.....
0050: 45 09 00 ed 49 72 08 E...Ir.
PID: 48 (0x0030)
Guess table from table id...
PMT-decoding....
Table_ID: 2 (0x02) [= Program Map Table (PMT)]
section_syntax_indicator: 1 (0x01)
(fixed '0'): 0 (0x00)
reserved_1: 3 (0x03)
Section_length: 84 (0x0054)
Program_number: 1 (0x0001)
reserved_2: 3 (0x03)
Version_number: 4 (0x04)
current_next_indicator: 1 (0x01) [= valid now]
Section_number: 0 (0x00)
Last_Section_number: 0 (0x00)
reserved_3: 7 (0x07)
PCR PID: 2048 (0x0800)
reserved_4: 15 (0x0f)
Program_info_length: 0 (0x0000)
Stream_type loop:
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: 2048 (0x0800)
reserved_2: 15 (0x0f)
ES_info_length: 18 (0x0012)
MPEG-DescriptorTag: 6 (0x06) [=
data_stream_alignment_descriptor]
Descriptor_length: 1 (0x01)
alignment_type: 2 (0x02)
as VideoStream: (= video access unit) as AudioStream: (=
reserved)
DVB-DescriptorTag: 134 (0x86) [= User defined/ATSC reserved]
Descriptor_length: 13 (0x0d)
Descriptor-data:
0000: e2 65 6e 67 7e 3f ff 65 6e 67 c1 3f ff
.eng~?.eng.?.
Stream_type: 129 (0x81) [= User private]
reserved_1: 7 (0x07)
Elementary_PID: 2049 (0x0801)
reserved_2: 15 (0x0f)
ES_info_length: 19 (0x0013)
MPEG-DescriptorTag: 5 (0x05) [= registration_descriptor]
Descriptor_length: 4 (0x04)
format_identifier: 1094921523 (0x41432d33) [= see: SC29]
AC-3
MPEG-DescriptorTag: 10 (0x0a) [= ISO_639_language_descriptor]
Descriptor_length: 4 (0x04)
ISO639_language_code: eng
Audio_type: 0 (0x00) [= undefined]
DVB-DescriptorTag: 129 (0x81) [= User defined/ATSC reserved]
Descriptor_length: 5 (0x05)
Descriptor-data:
0000: 08 b8 1b 09 1f
.....
Stream_type: 129 (0x81) [= User private]
reserved_1: 7 (0x07)
Elementary_PID: 2050 (0x0802)
reserved_2: 15 (0x0f)
ES_info_length: 19 (0x0013)
MPEG-DescriptorTag: 5 (0x05) [= registration_descriptor]
Descriptor_length: 4 (0x04)
format_identifier: 1094921523 (0x41432d33) [= see: SC29]
AC-3
MPEG-DescriptorTag: 10 (0x0a) [= ISO_639_language_descriptor]
Descriptor_length: 4 (0x04)
ISO639_language_code: eng
Audio_type: 0 (0x00) [= undefined]
DVB-DescriptorTag: 129 (0x81) [= User defined/ATSC reserved]
Descriptor_length: 5 (0x05)
Descriptor-data:
0000: 08 a9 45 09 00
..E..
CRC: 3981013512 (0xed497208)
==========================================================
0031 is similar to 0030.
As I have been saying the entire time I know what's there. Myth just doesn't
see it.
This is QAM c82 573000000. Program 1 is my local PBS channel. Program 2 is
my local WB channel.
I would have no problems with myth being able to see the channels are there
but having to identify the channels manually. Maybe add in an option to do a
PAT and PMT scan?
It could also be that my cable company is not yet done setting this up in my
area. 2 weeks ago I could get signal lock but dvbstream was reporting
unknown FE. A week later dvbstream is working and this is where we are now.
Not being finished is more likely. They do not even admit to sending the HD
WB channel yet in their lineup.
Marc
-----Original Message-----
From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Taylor Jacob
Sent: Friday, April 01, 2005 1:19 PM
To: Adam Gianola; Discussion about mythtv
Subject: Re: [mythtv-users] How do you "tune" subchannels in QAM?
I skim this list once a week or so, so I sorry I didn't see this before..
Whomever it was having the problem I need the following questions answered:
1. What cable carrier are you using?
2. Do you know what frequencies you can get unencrpyted channels on?
3. If you know the answer to number 2, can you please tune to these with
azap
and run dvbsnoop 0x1FFB and let me know if you get anything back.
What it sounds like is:
Mpeg Transport spec defines the PAT & PMT which is what all these posts are
talking about reading and getting video..
DVB and ATSC have another layer on top of this called SI (PSIP in ATSC).. If
your cable carrier has unencrypted digital cable channels they are supposed
to
be sending ATSC PSIP, but it sounds like yours is not.. I really didn't want
to
make a digital cable scan that just looked at the PAT and PMT since you
will
not get channel names, or anything useful from just the PAT & PMT.
Taylor
_______________________________________________
mythtv-users mailing list
mythtv-users at mythtv.org
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
More information about the mythtv-users
mailing list