[mythtv-users] change xlmtvid in MythTV database to get correct lineup data...

[AWC Lists]

I am located in Toronto using OTA ATSC with good success.  My only 
problem is Zap2It/Datadirect does not think that ATSC exists in Canada. 
  If I use a Canadian Postal code (even a zip code close to the 
Ontario/NY border) I only get one channel available as digital in 
Toronto (CityDT) but that maps to the wrong channel (53-1 when it should 
be 57-1). I get all the Buffalo digital channels just fine.

So here are the ATSC channels without Zap2It data available in Toronto.
channum	callsign	freqid
1_1 	OMNI 2/CJMT	44
5_1	CBLT-DT		20	
9_1	CFTO-DT		45
25_1	CBLFT-D		24
57_1	CITYHD		53
66_1	SunTV		66	

Looking at the "Channel channel info" page under settings in MythWeb, I 
have discovered the xmltvid, channum and callsign database entries.  For 
the above channels there is no data in the xmltvid column.

Now, Zap2It does offer channel data for the analog equivalents of these 
digital channels. I have determined the xmltvid for each of these 
channels as such.

callsign	xmltvid
CBLT		10091
CBLFT		10090
CFTO		10108
CJMT		31558
City		34200
CKXT		34227


If I were to plug in these xmltvid numbers into the currently blank 
xmltvid field (IE:  Force MythTV to use the XMLTV data from another 
channel) for the ATSC channels what would happen?  Would this provide me 
with the programming for these channels?  (Assume that I have subscribed 
to these analog channels at labs.zap2it.com.)

Does MythTV do other checks before doing this import, or does is simply 
parse the zap2it XML data based on the xmltvid?

Are there any other tips on what I can do to get Zap2it programming for 
these channels?  BTW, several polite emails to Zap2it explaining this 
situation have been ignored thus far, so I do not think that is an option.

I am asking before doing this as I want to make sure I do not blow 
anything up by making this change.

Thanks in advance.