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

Thu Mar 31 19:07:01 UTC 2005

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','aut
o',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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