[mythtv-users] What is changing my frequency tables?

Jan Schneider jan at horde.org
Wed Jan 28 14:41:45 UTC 2009


Hi,

as mentioned in an earlier thread, I have a flaky TT C-2300 DVB-c card  
that requires to downtune all transponder frequencies by 500kHz due to  
some card-specific brokenness. I don't want to patch the driver and  
neither do I want to hack the card. So I tried to do that in MythTV,  
but for some odd reasons that doesn't work.

What I did was to change the transponder table of my cable service  
provider to subtract this 500kHz, and re-run dvbscan. That worked  
fine, but to my suprise all channels appeared twice, first with my  
frequency table, then another time with the original table. I removed  
the rows that I didn't want from channels.conf and imported it to  
MythTV. And the same thing happened again! Now I have a few questions:

- Why is MythTV scanning the transponders again at all, I already  
provided the list with channels.conf?
- Where are both, dvbscan and MythTV, getting the original frequency  
table from? Is it provided through the DVB signal? Are they hardcoded  
somewhere?
- Finally: how can I stop that from happening?

I could probably fill the channels and dtv_multiplex tables manually  
with a script, but I would rather like to use the on-board facilities.  
And I really want to understand what is happening there and why.

Jan.

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