[mythtv-users] Trying to understand the multiplex values

[Kevin Kuphal]

On Dec 17, 2007 8:56 PM, Harry Devine <lifter89 at comcast.net> wrote:

> Hello everyone,
>
> I've been having trouble getting my Myth box to tune all of the channels
> that is being provided by Comcast.  I just upgraded to the SVN build as
> of 11/19/07, and tonight I thought I'd go through the effort of
> re-scanning my channels to see if my luck has improved.  I have my
> system set to NTSC for TV Format, us-cable as my frequency table (in
> mythtv-setup), and when I scan my channels on QAM-256 using the Cable
> frequency table, I get alot of channels that are named UNKNOWN108#5, etc.
>
> Now, taking that channel as an example, I'm trying to figure out what
> the relationship is between the information for that channel in the
> channel table and the dtv_multiplex table.  For this channel, I see the
> following (I'm only showing the relevant columns):
> chanid   channum   freqid   sourceid       callsign
> mplexid   serviceid
> 2112      108#5      108      1            UNKNOWN108#5   67            11
>
> For the dtv_multiplex table, I see the following information:
> mplexid   sourceid   frequency       modulation   sistandard
> 67            1            699000000    qam_256      atsc
>
> How does all of this information tie together?


The mplexid from the channel table ties the channel to the frequency.  The
service ID represents the PID (I think I have that right).  How you identify
the channels really doesn't have much to do with any of those.  You really
need to tune each channel in the frontend, bring up the channel editor, and
enter the XMLTVID for the channel which will tie it to the guide data.  I
believe from that editor then you can also change the callsign to match your
channel for easier identification.  Remember, channel numbers really mean
very little since the tuning information on QAM is the frequency and
serviceid.

I think it is all outlined here:

http://www.mythtv.org/wiki/index.php/Frontend_Channel_Editor

Kevin
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