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

Fri Apr 1 00:10:44 UTC 2005

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
<mythtv at sturgeonfamily.com> 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
> >
> >------------------------------------------------------------------------
> >
> >_______________________________________________
> >mythtv-users mailing list
> >mythtv-users at mythtv.org
> >http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >
> >
> 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
> 
> 
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> 
>