[mythtv-users] How does mythtv determine tuning frequency?

[Michael T. Dean]

On 06/04/2011 10:06 AM, Jerry Rubinow wrote:
> Myth suddenly started tuning to the wrong frequencies for my 
> HDHomerun.  I wanted to tweak just the few channels I get through the 
> HDHR, and I was unable to determine how it gets from the channel entry 
> in the "channel" table in the DB to the frequency it uses in the 
> channelscan_dtv_multiplex table.
>
> One channel in the channel table, for example, has a mplexid of 101 
> and a serviceid of 1143.  I look up the entry 
> in channelscan_dtv_multiplex with a transportid of 101.  This has a 
> frequency of 645000000.  However, this is not what I see in the 
> logfile that myth is tuning to - 513000000.

For digital channels, MythTV uses a starting frequency, then uses the 
information specified by tables in the digital stream you receive on 
that frequency.  If your frequencies have changed for a digital source, 
you really need to rescan.

Mike