Re: [mythtv-users] How do you "tune" subchannels in QAM?

John Sturgeon Thu, 31 Mar 2005 16:39:07 -0800

Adam Gianola wrote:

I can't figure out what is wrong because channel scanning doesn't seem
to work at all.  At least not for me... and it sounds like others are
also having the exact same problem.  Azap works and tunes fine and
captures work outside of mythtv using dvbstream.  I have viewed them
lots of times on several channels, it is fantastic to see HD captures
from digital cable :)

Mythtv, however, is not working with the hd3000-dvb & qam (or at least
hasn't been) for me.  It seems when scanning channels in mythtvsetup,
something is off, as the frequencies which lock are not added to the
database in any useable way.  I only get 'timeout tuning channel' or
'unable to tune channel' or something like this.  I thought maybe
database entries should be added to the tables 'dvb_channel' or
'dvb_pids' or 'channel' but the only thing i've been able to get are
entries to 'dtv_multiplex' after scanning which help (so I may
manually edit the db) but don't give any functionality.  I haven't
been able to view programs yet with the above method of manually
editing the database (away from the frontend), but i'm certainly
stumped otherwise and am not afraid to try this.

As i may have mentioned before, for me no channel information seems to come through with the TS which may be why myth is hanging here. I think that 'dvbscan -cvvv' after azap cxxx is where i would see this (outside of myth) but don't. Perhaps your cable system is providing this kind of information which is why you can get mythtv to autoscan. Then again, maybe there's something else I'm missing... If you can think of anything, I'm ready to try anything... even went so far as to install myth from cvs (reverted back to atrpms though), to see if something new was changed since the last release.

Cheers,
Adam

On Thu, 31 Mar 2005 15:25:23 -0800, John Sturgeon <[EMAIL PROTECTED]> wrote:

Marc Tousignant wrote:

I think I figured it out…

Since I knew C82 program 1 was my local PBS I located the correct
frequency for this channel in dtv_multiplex

INSERT INTO dtv_multiplex (mplexid, sourceid, transportid, networkid,
frequency, inversion, symbolrate, fec, polarity, modulation,
bandwidth, lp_code_rate, transmission_mode, guard_interval, visible,
constellation, hierarchy, hp_code_rate, sistandard, serviceversion,
updatetimestamp) VALUES
(89,1,NULL,NULL,573000000,'a',NULL,'auto',NULL,'qam_256','a','auto','a','auto',0,'auto','auto','auto','atsc',33,20050331082612);

Using this knowledge I then changed the mplexid of the correct listing
to 89 in channel.

INSERT INTO channel (chanid, channum, freqid, sourceid, callsign,
name, icon, finetune, videofilters, xmltvid, recpriority, contrast,
brightness, colour, hue, tvformat, commfree, visible, outputfilters,
useonairguide, mplexid, serviceid, atscsrcid) VALUES
(1802,'802','802',1,'WGBHDT','WGBHDT
(WGBH-DT)','none',NULL,'','28055',0,32768,32768,32768,32768,'Default',0,1,'',0,89,NULL,NULL);

Starting mythbackend I then saw

2005-03-31 13:55:09.792 SIParser: About to do a reset

2005-03-31 13:55:09.792 SIParser: Closing all PIDs

2005-03-31 13:55:09.792 SIParser: Using DelAllPids from SIParser which
does nothing

2005-03-31 13:55:09.792 SIParser: Resetting all Table Handlers

2005-03-31 13:55:09.792 SIParser: SIParser Reset due to channel change

2005-03-31 13:55:09.793 DVB#0 DVB SI Table Parser Started

2005-03-31 13:55:09.793 DVB#0 Using DVB card 0, with frontend pcHDTV
HD3000 HDTV.

2005-03-31 13:55:09.793 DVB#0 Trying to tune to channel 802.

2005-03-31 13:55:09.793 SIParser: Starting DVB Section Reader thread

2005-03-31 13:55:09.793 SIParser: Starting SIScanner

2005-03-31 13:55:09.794 DVB#0 Mod:

2005-03-31 13:55:09.794 SIParser: About to do a reset

2005-03-31 13:55:09.794 SIParser: Closing all PIDs

2005-03-31 13:55:09.795 SIParser: Resetting all Table Handlers

2005-03-31 13:55:09.795 SIParser: SIParser Reset due to channel change

2005-03-31 13:55:09.795 DVB#0 Waiting for frontend event after tune.

2005-03-31 13:55:10.055 DVB#0 DVB signal 977 | snr fde1 | ber 0 | unc 0

2005-03-31 13:55:10.055 DVB#0 Status: LOCK.

2005-03-31 13:55:10.055 SIParser: Requesting PAT

2005-03-31 13:55:10.055 DVB#0 Multiplex Locked

2005-03-31 13:55:10.055 SIParser: Adding a PMT (0) to the request list

2005-03-31 13:55:10.796 SIParser: Table[0]->RequirePIDs() == true

2005-03-31 13:55:10.797 SIParser: Adding PID 0 Filter 0 Mask ff Buffer
40960

2005-03-31 13:55:10.797 SIParser: Table[2]->RequirePIDs() == true

2005-03-31 13:55:10.797 SIParser: Adding PID 1ffb Filter ff Mask 0
Buffer 40960

2005-03-31 13:55:10.798 SIParser: Table[3]->RequirePIDs() == true

2005-03-31 13:55:10.798 SIParser: Adding PID 1ffb Filter ff Mask 0
Buffer 40960

2005-03-31 13:55:11.150 SIParser: PAT Version = 2

2005-03-31 13:55:11.150 SIParser: Tuned to TransportID: 32950

2005-03-31 13:55:11.150 SIParser: Services on this Transport: 1 2

2005-03-31 13:55:11.150 SIParser: Table[0]->Complete() == true

2005-03-31 13:55:11.150 SIParser: Table[1]->RequirePIDs() == true

2005-03-31 13:55:11.150 SIParser: Adding PID 0 Filter 2 Mask ff Buffer
40960

2005-03-31 13:55:16.059 DVB#0 Timeout Getting PMT

2005-03-31 13:55:16.059 DVB#0 ERROR - Tuning for channel #802 failed.

Taking a guess I then went back and changed the serviceid to 1 because
it was subchannel 1

INSERT INTO channel (chanid, channum, freqid, sourceid, callsign,
name, icon, finetune, videofilters, xmltvid, recpriority, contrast,
brightness, colour, hue, tvformat, commfree, visible, outputfilters,
useonairguide, mplexid, serviceid, atscsrcid) VALUES
(1802,'802','802',1,'WGBHDT','WGBHDT
(WGBH-DT)','none',NULL,'','28055',0,32768,32768,32768,32768,'Default',0,1,'',0,89,1,NULL);

Now I am getting this in mythbackend on start

2005-03-31 13:59:22.477 SIParser: About to do a reset

2005-03-31 13:59:22.477 SIParser: Closing all PIDs

2005-03-31 13:59:22.477 SIParser: Using DelAllPids from SIParser which
does nothing

2005-03-31 13:59:22.477 SIParser: Resetting all Table Handlers

2005-03-31 13:59:22.477 SIParser: SIParser Reset due to channel change

2005-03-31 13:59:22.478 DVB#0 DVB SI Table Parser Started

2005-03-31 13:59:22.478 SIParser: Starting DVB Section Reader thread

2005-03-31 13:59:22.478 DVB#0 Using DVB card 0, with frontend pcHDTV
HD3000 HDTV.

2005-03-31 13:59:22.478 DVB#0 Trying to tune to channel 802.

2005-03-31 13:59:22.478 SIParser: Starting SIScanner

2005-03-31 13:59:22.479 DVB#0 Mod:

2005-03-31 13:59:22.479 SIParser: About to do a reset

2005-03-31 13:59:22.480 SIParser: Closing all PIDs

2005-03-31 13:59:22.480 SIParser: Resetting all Table Handlers

2005-03-31 13:59:22.480 SIParser: SIParser Reset due to channel change

2005-03-31 13:59:22.480 DVB#0 Waiting for frontend event after tune.

2005-03-31 13:59:22.740 DVB#0 DVB signal 977 | snr fdc9 | ber 0 | unc 0

2005-03-31 13:59:22.740 DVB#0 Status: LOCK.

2005-03-31 13:59:22.740 SIParser: Requesting PAT

2005-03-31 13:59:22.740 DVB#0 Multiplex Locked

2005-03-31 13:59:22.740 SIParser: Adding a PMT (1) to the request list

2005-03-31 13:59:23.481 SIParser: Table[0]->RequirePIDs() == true

2005-03-31 13:59:23.481 SIParser: Adding PID 0 Filter 0 Mask ff Buffer
40960

2005-03-31 13:59:23.482 SIParser: Table[2]->RequirePIDs() == true

2005-03-31 13:59:23.482 SIParser: Adding PID 1ffb Filter ff Mask 0
Buffer 40960

2005-03-31 13:59:23.483 SIParser: Table[3]->RequirePIDs() == true

2005-03-31 13:59:23.483 SIParser: Adding PID 1ffb Filter ff Mask 0
Buffer 40960

2005-03-31 13:59:23.899 SIParser: PAT Version = 2

2005-03-31 13:59:23.900 SIParser: Tuned to TransportID: 32950

2005-03-31 13:59:23.900 SIParser: Services on this Transport: 1 2

2005-03-31 13:59:23.900 SIParser: Table[0]->Complete() == true

2005-03-31 13:59:23.900 SIParser: Table[1]->RequirePIDs() == true

2005-03-31 13:59:23.900 SIParser: Adding PID 30 Filter 2 Mask ff
Buffer 40960

2005-03-31 13:59:24.121 SIParser: PMT ServiceID: 1 Version = 4

2005-03-31 13:59:24.121 SIParser: PID: 2048

2005-03-31 13:59:24.121 SIParser: Unknown descriptor, tag = 6

2005-03-31 13:59:24.121 SIParser: Unknown descriptor, tag = 134

2005-03-31 13:59:24.121 SIParser: PID: 2049

2005-03-31 13:59:24.121 SIParser: Unknown descriptor, tag = 129

2005-03-31 13:59:24.122 SIParser: PID: 2050

2005-03-31 13:59:24.122 SIParser: Unknown descriptor, tag = 129

2005-03-31 13:59:24.122 SIParser: Table[1]->EmitRequired() == true

2005-03-31 13:59:24.122 DVB#0 Successfully tuned to channel 802.

I am not sure if this is really working as I am not at home to try it.
Was playing with it during my lunch break and wont be able to try till
I get home.

My hopes are high that I am on the right track thou.

I think quite a few of us working with the hd3000 are having the same

problem and are looking for solutions. I've posted both here and in

the hd3000 forum but it seems like no one has been able to find a

solution to this problem yet. I haven't posted to myth-dev yet, but

maybe thats the place where we may find someone who knows the answer

to our question, as i think it is a problem with how mythtvsetup is

handling the hd3000-dvb. For example, when i run dvbscan -cvvv no

channel information is given, but i've seen examples with OTA ATSC

streams where channel information is explicitly supplied in the

stream. Mythtv may be looking for this and since it doesn't come

through, myth assumes the channels are 'unable to tune'.

-Adam

for reference:

http://www.xmission.com/~pchdtv/forum/viewtopic.php?t=639

http://www.xmission.com/~pchdtv/forum/viewtopic.php?t=634

http://www.gossamer-threads.com/lists/mythtv/users/121772

http://www.gossamer-threads.com/lists/mythtv/users/120911

http://www.linuxtv.org/wiki/index.php/PcHDTV

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AACK!

You shouldn't have to do this! Please make sure your card is configured
correctly.. (see my previous post) Channel scanning should work just
fine, and put all of the appropriate entries in your channels lineup. If
it doesn't, something else is probably wrong.

--
John Sturgeon <><
http://www.sturgeonfamily.com/mythtv.php

The missing piece for me was the QAM part. I'm not sure if that makes a substantial difference, but that may be it. Perhaps other HD-3000 QAM folks can answer.

Good Luck!
--
John Sturgeon <><
http://www.sturgeonfamily.com/mythtv.php

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Re: [mythtv-users] How do you "tune" subchannels in QAM?

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