Bruce Pennypacker wrote:
bmerrill Merrill wrote:
I would like to get QAM working with MythTV. I am able to watch QAM HDTV from my cable
provider using a combination of dvb-apps, dvbtraffic and mplayer but scanning for the
channels using the latest MythTV cvs doesn't seem to work, i.e. it doesn't detect the
channels on the first pass and gets "stuck" on subsequent scanning of existing
transports. My understanding from the few scant threads I've been able to find on the
subject seem to indicate that my cable provider is not transmitting certain information
that Myth requires. I have tried calling them and speaking to the engineers but have not
been able to make much headway through the red tape, though my limited knowledge on what
exactly is missing probably doesn't help either.
However, I was wondering, if I have collected all the relevant info from
dvb-app such as Video PID, Audio PID, etc, would it be fairly straight forward
to manually add that information directly into MySQL? I am certainly no expert
with MySQL but I think I could figure out the relevant commands if someone
could point me in the direction of the relevant table(s) that I would need to
modify. But of course if someone knows the actual command that would be very
much appreciated as well. Or is there perhaps an even easier way than
modifying MySQL directly? Or should I not waste my time trying, i.e. a fix is
imminent?
You can do this by modifying one of the tables in mysql. Take a look at
http://www.pchdtv.com/forum/viewtopic.php?t=882 for an idea of what
you'll need to do. You will need to know a bit about mysql commands.
Here's a rundown of what you'll need to do:
$ mysql -u mythtv -p mythtv
(login to mysql)
mysql> use mythconverg;
(all myth data is in the mythconverg database - do this before any of
the following commands)
mysql> describe channel;
(displays the structure of the channel table - this is the one you need
to modify)
mysql> describe dtv_multiplex;
(you'll need some data from this table as well)
mysql> select mplexid,frequency from dtv_multiplex;
(you might just want to cut & paste this into a file and/or print it out
so you can refer back to it)
mysql> select chanid,channum,freqid,mplexid,serviceid from channel;
(shows all the necessary fields you'll care about in the channel table)
The above commands, along with what's posted at that pchdtv.com url,
should be enough for you to manually configure your QAM channels. The
only really tricky part is figuring out what you should use for the
serviceid since that requires a bit of trial & error with the dvb-apps.
It's based on the audio/video PID's but it's just a sequence #, not the
actual PID's...
-Bruce
------------------------------------------------------------------------
_______________________________________________
mythtv-users mailing list
[email protected]
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Thanks for the information and the link. I haven't quite got it working
yet, but I think I'm close. I am guessing as you hypothesized that the
serviceid might be the wild card that isn't properly set and preventing
me from tuning the channel. As I have it configured now, when I start
up mythbackend I get the following output:
Starting up as the master server.
2005-07-26 22:58:29.947 mythbackend: MythBackend started as master server
2005-07-26 22:58:29.951 DVB#0 DVB SI Table Parser Started
2005-07-26 22:58:29.951 DVB#0 Using DVB card 0, with frontend pcHDTV
HD3000 HDTV.
2005-07-26 22:58:29.953 New DB connection, total: 3
2005-07-26 22:58:30.217 DVB#0 DVB signal f998 | snr fc21 | ber 0 |
unc 0
2005-07-26 22:58:30.217 DVB#0 Status: LOCK.
2005-07-26 22:58:30.217 DVB#0 Multiplex Locked
2005-07-26 22:58:36.221 DVB#0 Timeout Getting PMT
2005-07-26 22:58:36.221 DVB#0 ERROR - Tuning for channel #2_1 failed.
2005-07-26 22:58:36.221 Closing DVB channel
So I'm guessing that the "Timeout Getting PMT" error has to do with the
serviceid and myth not being able to find the video and audio PIDs, but
perhaps I'm wrong in that assumption and perhaps I have something
misconfigured elsewhere? If I run "azap -r c110" for example and then
run dvbtraffic in another window, the video and audio pids appear to be
in the second grouping which according to the pchdtv thread above would
correspond to a serviceid value of 2, but I have tried setting the
serviceid with a value from 0 all the way up to 10 with no luck.
A general rundow of what I have done so far:
1. Added a video source corresponding to HDTV over the air stations
since these should be equivalent to HDTV cable without adding all of the
analog cable channels that would just get in the way.
2. Tried running "Scan for channels" first with terrestrial then again
with cable but it failed to add any channels, although it did add the
frequencies.
3. Ran mythfilldatabase to at least initialize the channel table
4. In MySql, set the freqid obtained from dvb-apps:
mysql> update channel set freqid=711000000 where channum="2_1";
5. Obtained the mplexid corresponding to freq 711000000 which was 6 in
my case
mysql> select mplexid,frequency from dtv_multiplex;
6. Set the mplexid in the channel table:
mysql> update channel set mplexid=6 where channum="2_1";
7. Tried to set the serviceid based on information my dvbtraffic
mysql> update channel set serviceid=2 where channum="2_1";
Is there I've missed or done wrong in the above steps? Thank you very
much for your help.
-Brian
_______________________________________________
mythtv-users mailing list
[email protected]
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
