[mythtv-users] UK DVB-T Mendip Tuning Fails with Error: Wrong PMT
Nigel Jewell
nige at grufty.co.uk
Wed Jul 6 19:28:12 UTC 2011
Hi all,
Up until about 2 months ago I was able to receive all Freeview channels
on my MythTV box without any issues using a Hauppage Nova-T DVB card
from the Mendip transmitter, however at the end of May I noticed that
all channels on a single multiplex were failing to tune.
If I plug the aerial directly into my TV (which also has a Freeview
tuner) I receive all channels with good quality, so I can safely assume
that I should be able to pick it up.
Using dvbscan as:
/usr/bin/scandvb -u -vvv uk-Mendip
I can see the channels with the same multiplex information that they had
before (for example):
ITV4:842000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_3_4:FEC_3_4:QAM_16:TRANSMISSION_MODE_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE:601:602:28032:24
But when I try to tune I see from the backend PMT errors (for example):
...
mythbackend.log:2011-07-05 21:19:37.876
DTVSM(/dev/dvb/adapter2/frontend0) Error: Wrong PMT; pmt->pn(26624)
desired(28032)
mythbackend.log:2011-07-05 21:19:37.909
DTVSM(/dev/dvb/adapter2/frontend0) Error: Wrong PMT; pmt->pn(26240)
desired(28032)
...
Something of interest is that dvbscan fails to spot the multiplex
descriptor (no sign of 842000000) - despite the fact that it spots the
channel:
parse_terrestrial_delivery_system_descriptor:496: 0x3098/0x1041
794000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_32:HIERARCHY_NONE
parse_terrestrial_delivery_system_descriptor:496: 0x3098/0x200c
738000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_32:HIERARCHY_NONE
parse_terrestrial_delivery_system_descriptor:496: 0x3098/0x3002
802166670:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE
parse_terrestrial_delivery_system_descriptor:496: 0x3098/0x3006
802167000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_32:HIERARCHY_NONE
parse_terrestrial_delivery_system_descriptor:496: 0x3098/0x5000
754166670:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_3_4:FEC_3_4:QAM_16:TRANSMISSION_MODE_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE
parse_terrestrial_delivery_system_descriptor:496: 0x3098/0x5040
754167000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_32:HIERARCHY_NONE
parse_terrestrial_delivery_system_descriptor:496: 0x3098/0x6040
778167000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_32:HIERARCHY_NONE
Any ideas? I'm not sure where to begin with this as it could be a fault
of the signal, of the kernel drivers, or of MythTV ... or maybe my
channel configuration data ...
I've pasted the channel configuration from the database below.
Kind Regards,
Nige.
mysql> select * from channel inner join dtv_multiplex on channel.mplexid
= dtv_multiplex.mplexid where callsign = 'ITV4'\G
*************************** 1. row ***************************
chanid: 160024
channum: 24
freqid: NULL
sourceid: 1
callsign: ITV4
name: ITV4
icon: /mythtv/icon/ITV4.png
finetune: NULL
videofilters:
xmltvid: itv4.itv.co.uk
recpriority: 0
contrast: 32768
brightness: 32768
colour: 32768
hue: 32768
tvformat: Default
visible: 1
outputfilters:
useonairguide: 0
mplexid: 16
serviceid: 28032
tmoffset: 0
atsc_major_chan: 0
atsc_minor_chan: 0
last_record: 2011-06-11 20:55:02
default_authority:
commmethod: -1
mplexid: 16
sourceid: 1
transportid: 24576
networkid: 9018
frequency: 842000000
inversion: a
symbolrate: 0
fec: auto
polarity: v
modulation: qam_64
bandwidth: 8
lp_code_rate: 3/4
transmission_mode: 2
guard_interval: 1/32
visible: 0
constellation: qam_16
hierarchy: n
hp_code_rate: 3/4
mod_sys: UNDEFINED
rolloff: 0.35
sistandard: dvb
serviceversion: 8
updatetimestamp: 2010-05-31 19:29:14
default_authority:
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