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FreeviewHD (UK) scanning/partial lock problem

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J.Pilk at tesco

Dec 18, 2011, 12:39 PM

Post #1 of 12 (1492 views)
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FreeviewHD (UK) scanning/partial lock problem

I've just connected a PCTVnanoStick T2 to my laptop running 0.24-fixes
under SL6 with the driver package created by the media_build script.
This was done shortly before similar kmdls became available for Fedora
and RHEL6-near-clones from ATrpms.

I'm lacking HD display and processing capability at present, but I've
seen both SD and HD channels with VLC; Myth is OK with SD but gets only
partial lock on HD.

For vlc the procedure is: Media > Open Capture Device > DVB >
DVB-T/Transponder Frequency (769666kHz for Waltham)/Bandwidth 8MHz >
Watch the pretty pictures - in my case sometimes a bit pixellated.
This gives BBC HD: other programs are selected from Playback > Program.
The same procedure gives SD if an appropriate mux frequency is
specified. HD Codec info reported 1920*1080 resolution.

In Mythtvsetup the identification of the right options for the device
was confusing: several card types and chips were offered as
possibilities but only the DVB-T option seems to do anything useful.

For Mythtvsetup use the Transport Editor to define frequency
(769666666Hz), Bandwidth 8MHz and Modulation QAM-256, then scan;
scanning with transport links enabled populated the 5 SD transports and
also found the 4 HD channels but didn't add netid or tid to the HD
transport. Scanning just the HD transport without the links found just
the HD channels. Starting from the SD transports didn't link to the HD
transport. Scanning the HD transport without presetting to QAM-256
found nothing.

Details of the HD channels found, and a few SD for comparison:

qam_256:769666666:BBC HD:54:12323:9018:17472:16517=16517:dvb
0:cnt(pnum:1,channum:1)
qam_256:769666666:BBC One HD:50:12323:9018:17540:16517=16517:dvb
0:cnt(pnum:1,channum:1)
qam_256:769666666:ITV1 HD:51:12323:9018:17605:16517=16517:dvb
0:cnt(pnum:1,channum:1)
qam_256:769666666:Channel 4 HD:52:12323:9018:17664:16517=16517:dvb
0:cnt(pnum:1,channum:1)
qam_64:794000000:BBC ONE:1:12323:9018:4166:4166=4166:dvb
0:cnt(pnum:1,channum:1)
qam_64:794000000:BBC TWO:2:12323:9018:4287:4166=4166:dvb
0:cnt(pnum:1,channum:1)
qam_64:794000000:BBC THREE:7:12323:9018:4288:4166=4166:dvb
0:cnt(pnum:1,channum:1)

But on starting Mythfrontend I get:

011-12-18 20:11:38.351 DTVSM(/dev/dvb/adapter0/frontend0) Error: Wrong
PMT; pmt->pn(17472) desired(17540)
2011-12-18 20:11:38.368 DTVSM(/dev/dvb/adapter0/frontend0) Error: Wrong
PMT; pmt->pn(17664) desired(17540)
2011-12-18 20:11:38.394 DTVSM(/dev/dvb/adapter0/frontend0) Error: Wrong
PMT; pmt->pn(17605) desired(17540)

Is this the cause of the partial lock, and should it be reported
somewhere else?

TIA

John P

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J.Pilk at tesco

Dec 19, 2011, 6:39 AM

Post #2 of 12 (1451 views)
Permalink

Re: FreeviewHD (UK) scanning/partial lock problem [In reply to]

On 18/12/11 20:39, John Pilkington wrote:
> I've just connected a PCTVnanoStick T2 to my laptop running 0.24-fixes
> under SL6 with the driver package created by the media_build script.
> This was done shortly before similar kmdls became available for Fedora
> and RHEL6-near-clones from ATrpms.
>
> I'm lacking HD display and processing capability at present, but I've
> seen both SD and HD channels with VLC; Myth is OK with SD but gets only
> partial lock on HD.
>
> For vlc the procedure is: Media> Open Capture Device> DVB>
> DVB-T/Transponder Frequency (769666kHz for Waltham)/Bandwidth 8MHz>
> Watch the pretty pictures - in my case sometimes a bit pixellated.
> This gives BBC HD: other programs are selected from Playback> Program.
> The same procedure gives SD if an appropriate mux frequency is
> specified. HD Codec info reported 1920*1080 resolution.
>
> In Mythtvsetup the identification of the right options for the device
> was confusing: several card types and chips were offered as
> possibilities but only the DVB-T option seems to do anything useful.
>
> For Mythtvsetup use the Transport Editor to define frequency
> (769666666Hz), Bandwidth 8MHz and Modulation QAM-256, then scan;
> scanning with transport links enabled populated the 5 SD transports and
> also found the 4 HD channels but didn't add netid or tid to the HD
> transport. Scanning just the HD transport without the links found just
> the HD channels. Starting from the SD transports didn't link to the HD
> transport. Scanning the HD transport without presetting to QAM-256
> found nothing.
>
> Details of the HD channels found, and a few SD for comparison:
>
> qam_256:769666666:BBC HD:54:12323:9018:17472:16517=16517:dvb
> 0:cnt(pnum:1,channum:1)
> qam_256:769666666:BBC One HD:50:12323:9018:17540:16517=16517:dvb
> 0:cnt(pnum:1,channum:1)
> qam_256:769666666:ITV1 HD:51:12323:9018:17605:16517=16517:dvb
> 0:cnt(pnum:1,channum:1)
> qam_256:769666666:Channel 4 HD:52:12323:9018:17664:16517=16517:dvb
> 0:cnt(pnum:1,channum:1)
> qam_64:794000000:BBC ONE:1:12323:9018:4166:4166=4166:dvb
> 0:cnt(pnum:1,channum:1)
> qam_64:794000000:BBC TWO:2:12323:9018:4287:4166=4166:dvb
> 0:cnt(pnum:1,channum:1)
> qam_64:794000000:BBC THREE:7:12323:9018:4288:4166=4166:dvb
> 0:cnt(pnum:1,channum:1)
>
> But on starting Mythfrontend I get:
>
> 011-12-18 20:11:38.351 DTVSM(/dev/dvb/adapter0/frontend0) Error: Wrong
> PMT; pmt->pn(17472) desired(17540)
> 2011-12-18 20:11:38.368 DTVSM(/dev/dvb/adapter0/frontend0) Error: Wrong
> PMT; pmt->pn(17664) desired(17540)
> 2011-12-18 20:11:38.394 DTVSM(/dev/dvb/adapter0/frontend0) Error: Wrong
> PMT; pmt->pn(17605) desired(17540)
>
> Is this the cause of the partial lock, and should it be reported
> somewhere else?

Apologies for replying to myself, but Myth is now playing Channel 4 HD;
it stops and restarts ok but seems to have a problem in starting
initially. The vlc initial startup is also uncertain and tells me to
look at the log, which I haven't yet found; then after a few more random
tries it's ok. Suggestions?

John P

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J.Pilk at tesco

Dec 19, 2011, 7:28 AM

Post #3 of 12 (1450 views)
Permalink

Re: FreeviewHD (UK) scanning/partial lock problem [In reply to]

On 19/12/11 14:39, John Pilkington wrote:

> Apologies for replying to myself, but Myth is now playing Channel 4 HD;
> it stops and restarts ok but seems to have a problem in starting
> initially. The vlc initial startup is also uncertain and tells me to
> look at the log, which I haven't yet found; then after a few more random
> tries it's ok. Suggestions?
>

..and again. Disregard the claim to be playing HD; it was plain Channel
4. Sorry...

John P
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lee295012 at gmail

Dec 19, 2011, 9:00 AM

Post #4 of 12 (1441 views)
Permalink

Re: FreeviewHD (UK) scanning/partial lock problem [In reply to]

Have you tried the 290e in windows?
i found the linux driver to be not as good as the windows one, it could
be down to better gain handling in the windows driver.
after switch over on Tacolneston i would get zero channels picked up,
luckly i had a variable attenuator so could lower the signal then my 2x
290e's were fine.

if it works in windows you may have the same problem.

using Ubuntu Oneiric x86.

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J.Pilk at tesco

Dec 19, 2011, 11:20 AM

Post #5 of 12 (1433 views)
Permalink

Re: FreeviewHD (UK) scanning/partial lock problem [In reply to]

On 12/19/2011 05:00 PM, Lee Donaghy wrote:
> Have you tried the 290e in windows?
> i found the linux driver to be not as good as the windows one, it could
> be down to better gain handling in the windows driver.
> after switch over on Tacolneston i would get zero channels picked up,
> luckly i had a variable attenuator so could lower the signal then my 2x
> 290e's were fine.
>
> if it works in windows you may have the same problem.
>
> using Ubuntu Oneiric x86.
>

In principle I have a windows machine, but it's a multi-boot with the
main myth box and hasn't been active for months. I'm pretty sure the
demodulation is creating the right stream parameters, though - when it
gets started; I just don't think they're being passed on. I've opened
ticket #10217 about that.

Maybe I'll try signal-level adjustments if nothing else turns up. Thanks!

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nick.rout at gmail

Dec 19, 2011, 1:04 PM

Post #6 of 12 (1427 views)
Permalink

Re: FreeviewHD (UK) scanning/partial lock problem [In reply to]

On Mon, Dec 19, 2011 at 9:39 AM, John Pilkington <J.Pilk [at] tesco> wrote:
> I've just connected a PCTVnanoStick T2 to my laptop running 0.24-fixes
> under SL6 with the driver package created by the media_build script.
> This was done shortly before similar kmdls became available for Fedora
> and RHEL6-near-clones from ATrpms.
>
> I'm lacking HD display and processing capability at present, but I've
> seen both SD and HD channels with VLC; �Myth is OK with SD but gets only
> partial lock on HD.
>
> For vlc the procedure is: �Media > Open Capture Device > DVB >
> DVB-T/Transponder Frequency (769666kHz for Waltham)/Bandwidth 8MHz >
> Watch the pretty pictures - in my case sometimes a bit pixellated.
> This gives BBC HD: other programs are selected from Playback > Program.
> �The same procedure gives SD if an appropriate mux frequency is
> specified. �HD Codec info reported 1920*1080 resolution.
>
> In Mythtvsetup the identification of the right options for the device
> was confusing: several card types and chips were offered as
> possibilities but only the DVB-T option seems to do anything useful.
>
> For Mythtvsetup use the Transport Editor to define frequency
> (769666666Hz),

shouldn't that be 769666000?
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J.Pilk at tesco

Dec 19, 2011, 1:51 PM

Post #7 of 12 (1428 views)
Permalink

Re: FreeviewHD (UK) scanning/partial lock problem [In reply to]

On 12/19/2011 09:04 PM, Nick Rout wrote:
> On Mon, Dec 19, 2011 at 9:39 AM, John Pilkington<J.Pilk [at] tesco> wrote:
>> I've just connected a PCTVnanoStick T2 to my laptop running 0.24-fixes
>> under SL6 with the driver package created by the media_build script.
>> This was done shortly before similar kmdls became available for Fedora
>> and RHEL6-near-clones from ATrpms.
>>
>> I'm lacking HD display and processing capability at present, but I've
>> seen both SD and HD channels with VLC; Myth is OK with SD but gets only
>> partial lock on HD.
>>
>> For vlc the procedure is: Media> Open Capture Device> DVB>
>> DVB-T/Transponder Frequency (769666kHz for Waltham)/Bandwidth 8MHz>
>> Watch the pretty pictures - in my case sometimes a bit pixellated.
>> This gives BBC HD: other programs are selected from Playback> Program.
>> The same procedure gives SD if an appropriate mux frequency is
>> specified. HD Codec info reported 1920*1080 resolution.
>>
>> In Mythtvsetup the identification of the right options for the device
>> was confusing: several card types and chips were offered as
>> possibilities but only the DVB-T option seems to do anything useful.
>>
>> For Mythtvsetup use the Transport Editor to define frequency
>> (769666666Hz),
>
> shouldn't that be 769666000?

This is getting even more embarrassing: a quick google suggests it's
770.0 MHz. The 769666666 was initially generated by a vlc scan that I
triggered unexpectedly by entering dvb:// when I was beginning to lose
hope. It started, IIRC, at 170 MHz and crawled past two or three SD
muxes without finding anything; I had moved away when it started
playing, and that was what it showed then. I didn't check, and my post
was intended to give the syntax that seemed to work rather than the
actual frequency. It seemed to work with the myth scan too, but it just
could be the source of the other problems. Round the loop a few more
times, I fear.
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J.Pilk at tesco

Dec 19, 2011, 2:21 PM

Post #8 of 12 (1429 views)
Permalink

Re: FreeviewHD (UK) scanning/partial lock problem [In reply to]

On 12/19/2011 09:51 PM, John Pilkington wrote:
> On 12/19/2011 09:04 PM, Nick Rout wrote:
>> On Mon, Dec 19, 2011 at 9:39 AM, John Pilkington<J.Pilk [at] tesco> wrote:
>>> I've just connected a PCTVnanoStick T2 to my laptop running 0.24-fixes
>>> under SL6 with the driver package created by the media_build script.
>>> This was done shortly before similar kmdls became available for Fedora
>>> and RHEL6-near-clones from ATrpms.
>>>
>>> I'm lacking HD display and processing capability at present, but I've
>>> seen both SD and HD channels with VLC; Myth is OK with SD but gets only
>>> partial lock on HD.
>>>
>>> For vlc the procedure is: Media> Open Capture Device> DVB>
>>> DVB-T/Transponder Frequency (769666kHz for Waltham)/Bandwidth 8MHz>
>>> Watch the pretty pictures - in my case sometimes a bit pixellated.
>>> This gives BBC HD: other programs are selected from Playback> Program.
>>> The same procedure gives SD if an appropriate mux frequency is
>>> specified. HD Codec info reported 1920*1080 resolution.
>>>
>>> In Mythtvsetup the identification of the right options for the device
>>> was confusing: several card types and chips were offered as
>>> possibilities but only the DVB-T option seems to do anything useful.
>>>
>>> For Mythtvsetup use the Transport Editor to define frequency
>>> (769666666Hz),
>>
>> shouldn't that be 769666000?
>
> This is getting even more embarrassing: a quick google suggests it's
> 770.0 MHz. The 769666666 was initially generated by a vlc scan that I
> triggered unexpectedly by entering dvb:// when I was beginning to lose
> hope. It started, IIRC, at 170 MHz and crawled past two or three SD
> muxes without finding anything; I had moved away when it started
> playing, and that was what it showed then. I didn't check, and my post
> was intended to give the syntax that seemed to work rather than the
> actual frequency. It seemed to work with the myth scan too, but it just
> could be the source of the other problems. Round the loop a few more
> times, I fear.

No overall change; it's still passing zeroes for transport_id and
network_id. Of course these might be understood as default values to be
replaced from somewhere else....

This is from mythbackend -v channel

011-12-19 22:10:05.750 TVRec(1): Changing from None to WatchingLiveTV

2011-12-19 22:10:05.751 TVRec(1): Start channel: 50.

2011-12-19 22:10:05.755 TVRec(1): HW Tuner: 1->1

2011-12-19 22:10:05.756 DVBChan(1:/dev/dvb/adapter0/frontend0): Opening
DVB channel

2011-12-19 22:10:05.760 LoadFromScheduler(): Error, called from backend.

2011-12-19 22:10:05.771 AutoExpire: CalcParams(): Max required Free
Space: 3.0 GB w/freq: 14 min

2011-12-19 22:10:05.792 ChannelBase(1): SelectChannel 50

2011-12-19 22:10:05.792 DVBChan(1:/dev/dvb/adapter0/frontend0): Opening
DVB channel

2011-12-19 22:10:05.792 ChannelThread::run

2011-12-19 22:10:05.793 DVBChan(1:/dev/dvb/adapter0/frontend0):
SetChannelByString(50):

2011-12-19 22:10:05.794 DVBSM(/dev/dvb/adapter0/frontend0): Can measure
Signal Strength

2011-12-19 22:10:05.795 DVBSM(/dev/dvb/adapter0/frontend0): Can measure
S/N

2011-12-19 22:10:05.797 DVBSM(/dev/dvb/adapter0/frontend0): Can measure
Bit Error Rate

2011-12-19 22:10:05.797 DVBSM(/dev/dvb/adapter0/frontend0): Can count
Uncorrected Blocks

2011-12-19 22:10:05.797 SM(/dev/dvb/adapter0/frontend0)::RemoveFlags:
Seen() Match() Wait()

2011-12-19 22:10:05.797 DVBSM(/dev/dvb/adapter0/frontend0):
DVBSignalMonitor::ctor initial flags Seen() Match()
Wait(Sig,SNR,BER,UB,)
2011-12-19 22:10:05.797 SM(/dev/dvb/adapter0/frontend0)::Start: begin

2011-12-19 22:10:05.797 SM(/dev/dvb/adapter0/frontend0)::Start: end

2011-12-19 22:10:05.799 DVBChan(1:/dev/dvb/adapter0/frontend0):
770000000 qam_256 a auto auto 8 a auto a v fec: auto msys: UNDEFINED
rolloff: 0.35
2011-12-19 22:10:05.799 DVBChan(1:/dev/dvb/adapter0/frontend0): Old
Params: 770000000 qam_256 a auto auto 8 a auto a v fec: auto msys:
UNDEFINED rolloff: 0.35

DVBChan(1:/dev/dvb/adapter0/frontend0): New
Params: 770000000 qam_256 a auto auto 8 a auto a v fec: auto msys:
UNDEFINED rolloff: 0.35

2011-12-19 22:10:05.799 DVBChan(1:/dev/dvb/adapter0/frontend0): Tune():
Frequency tuning successful.

2011-12-19 22:10:05.800 DVBChan(1:/dev/dvb/adapter0/frontend0):
SetChannelByString(50): Tuned to frequency.

2011-12-19 22:10:05.853
DTVSM(/dev/dvb/adapter0/frontend0)::SetDVBService(transport_id: 0,
network_id: 0, service_id: 17540):
2011-12-19 22:10:05.853 SM(/dev/dvb/adapter0/frontend0)::RemoveFlags:
Seen(PMT,SDT,Crypt,) Match(PMT,SDT,Crypt,) Wait()

2011-12-19 22:10:05.853 SM(/dev/dvb/adapter0/frontend0)::AddFlags:
Seen() Match() Wait(PMT,SDT,)

2011-12-19 22:10:05.853 SM(/dev/dvb/adapter0/frontend0)::AddFlags:
Seen() Match() Wait(PMT,SDT,Pos,)

2011-12-19 22:10:05.853 SM(/dev/dvb/adapter0/frontend0)::AddFlags:
Seen() Match() Wait(Sig,)

2011-12-19 22:10:05.853 SM(/dev/dvb/adapter0/frontend0)::RemoveFlags:
Seen() Match() Wait(Pos,)

2011-12-19 22:10:05.859 DVBSM(/dev/dvb/adapter0/frontend0): UpdateValues
-- Signal Locked

2011-12-19 22:10:05.859
DTVSM(/dev/dvb/adapter0/frontend0)::GetStatusList: WaitForPMT seen(0)
matching(0)
2011-12-19 22:10:06.018 SM(/dev/dvb/adapter0/frontend0)::AddFlags:
Seen(PAT,) Match() Wait()

2011-12-19 22:10:06.018 SM(/dev/dvb/adapter0/frontend0)::AddFlags:
Seen() Match(PAT,) Wait()

2011-12-19 22:10:06.069 SM(/dev/dvb/adapter0/frontend0)::AddFlags:
Seen(PMT,) Match() Wait()

2011-12-19 22:10:06.069 SM(/dev/dvb/adapter0/frontend0)::AddFlags:
Seen() Match(PMT,) Wait()

2011-12-19 22:10:06.111
DTVSM(/dev/dvb/adapter0/frontend0)::GetStatusList: WaitForPMT seen(1)
matching(1)
2011-12-19 22:10:06.120 DTVSM(/dev/dvb/adapter0/frontend0): Time Offset:
-0.12047

2011-12-19 22:10:06.472 SM(/dev/dvb/adapter0/frontend0)::AddFlags:
Seen(SDT,) Match() Wait()

2011-12-19 22:10:07.126 DTVSM(/dev/dvb/adapter0/frontend0): Time Offset:
-0.1233

2011-12-19 22:10:08.131 DTVSM(/dev/dvb/adapter0/frontend0): Time Offset:
-0.126163
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dekarl at spaetfruehstuecken

Dec 19, 2011, 3:08 PM

Post #9 of 12 (1424 views)
Permalink

Re: FreeviewHD (UK) scanning/partial lock problem [In reply to]

On 19.12.2011 22:51, John Pilkington wrote:
>>> DVB-T/Transponder Frequency (769666kHz for Waltham)/Bandwidth 8MHz>
>>>
>>> For Mythtvsetup use the Transport Editor to define frequency
>>> (769666666Hz),
>>
>> shouldn't that be 769666000?
>
> This is getting even more embarrassing: a quick google suggests it's
> 770.0 MHz. The 769666666 was initially generated by a vlc scan that I

according to the MythTV frequency table that should be 770MHz with an
optional offset of +166670Hz or -166670Hz.
Looks like VLC somehow ended up trying 770MHz -2*166670Hz = 769666660Hz
which seems to be close enough for your hardware to get a lock on the
signal. From the log in the other mail 770000000Hz seems to be close
enough, too.

> qam_256:769666666:BBC One HD:50:12323:9018:17540:16517=16517:dvb

just for kicks you might try manually setting the original_network_id to
9018 (thats the UK's DVB-T ONID) and the transport_id to 12323 for
the multiplex at 770MHz and see what happens.

Regards,
Karl
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J.Pilk at tesco

Dec 20, 2011, 3:31 AM

Post #10 of 12 (1405 views)
Permalink

Re: FreeviewHD (UK) scanning/partial lock problem [In reply to]

On 19/12/11 23:08, Karl Dietz wrote:

<snip>

> just for kicks you might try manually setting the original_network_id to
> 9018 (thats the UK's DVB-T ONID) and the transport_id to 12323 for
> the multiplex at 770MHz and see what happens.
>
> Regards,
> Karl

Thanks, Karl. It seems I have other problems with that machine: at
present it's dying without warning a minute or two after booting.

But I would have tried setting the ids from mythtvsetup if I had found a
way to do it. I think I can read the required values from the channel
scan. Have I missed it in the menus, or do I need to go to mythweb or
directly into the database to do it?

And on that topic, is it safe to use MySQL Workbench to get a broader
view of what's there? I've played with it before but couldn't see a way
of guaranteeing that it was readonly.

John P
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dekarl at spaetfruehstuecken

Dec 20, 2011, 10:14 AM

Post #11 of 12 (1398 views)
Permalink

Re: FreeviewHD (UK) scanning/partial lock problem [In reply to]

On 20.12.2011 12:31, John Pilkington wrote:
> On 19/12/11 23:08, Karl Dietz wrote:
>> just for kicks you might try manually setting the original_network_id to
>> 9018 (thats the UK's DVB-T ONID) and the transport_id to 12323 for
>> the multiplex at 770MHz and see what happens.
>
> But I would have tried setting the ids from mythtvsetup if I had found a
> way to do it. I think I can read the required values from the channel
> scan. Have I missed it in the menus, or do I need to go to mythweb or
> directly into the database to do it?

sorry, I just tested it on master and you will see the values in
mythtv-setup -> 5. Channels -> Edit Transponders
but I could not find a way to change them there ...

The only other way I know is direct database editing which is frowned
upon or writing a small script, using the bindings or new service API,
to edit the transports.

Regards,
Karl
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J.Pilk at tesco

Dec 20, 2011, 3:04 PM

Post #12 of 12 (1400 views)
Permalink

Re: FreeviewHD (UK) scanning/partial lock problem [In reply to]

On 12/20/2011 06:14 PM, Karl Dietz wrote:
> On 20.12.2011 12:31, John Pilkington wrote:
>> On 19/12/11 23:08, Karl Dietz wrote:
>>> just for kicks you might try manually setting the original_network_id to
>>> 9018 (thats the UK's DVB-T ONID) and the transport_id to 12323 for
>>> the multiplex at 770MHz and see what happens.
>>
>> But I would have tried setting the ids from mythtvsetup if I had found a
>> way to do it. I think I can read the required values from the channel
>> scan. Have I missed it in the menus, or do I need to go to mythweb or
>> directly into the database to do it?
>
> sorry, I just tested it on master and you will see the values in
> mythtv-setup -> 5. Channels -> Edit Transponders
> but I could not find a way to change them there ...
>
> The only other way I know is direct database editing which is frowned
> upon or writing a small script, using the bindings or new service API,
> to edit the transports.
>
> Regards,
> Karl

It seems to be working after a) removing the failing battery pack and b)
issuing these command lines from a terminal. The usual cautions apply.

echo "update dtv_multiplex set transportid=16517 where
frequency=770000000 ;" | mysql -u mythtv -pmythtv mythconverg

echo "update dtv_multiplex set networkid=9018 where frequency=770000000
;" | mysql -u mythtv -pmythtv mythconverg

where the numbers are taken from these lines in the mythtvsetup terminal
output, and will differ for other transmitters.

qam_256:770000000:BBC HD:54:12323:9018:17472:16517=16517:dvb
0:cnt(pnum:1,channum:1)

qam_256:770000000:BBC One HD:50:12323:9018:17540:16517=16517:dvb
0:cnt(pnum:1,channum:1)

qam_256:770000000:ITV1 HD:51:12323:9018:17605:16517=16517:dvb
0:cnt(pnum:1,channum:1)

qam_256:770000000:Channel 4 HD:52:12323:9018:17664:16517=16517:dvb
0:cnt(pnum:1,channum:1)

HTH

John P
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