[mythtv-users] how to set xmltvid to unknown and keep it there?

[Eric Sharkey]

I've been having this problem since I've switched to Verizon back in
November.  When I do the channel scan with my HDHR, there are a lot of
channels that come up with the wrong call sign and xmltvid.  I can
manually assign values for these channels when I know what the channel
is and that seems to work fine, but when I haven't been able to figure
out what the channel is, and set it to NULL or 0, then at some point
later mythtv seems to set it back to the erroneously scanned value.
For example, everything on freqid 127 is coming up as History
International, and everything on 128 is coming up as History, but all
of these channels are local community access channels.  They don't all
broadcast 24/7, so figuring out which is which is a little tricky.
The problem is that whenever I have something scheduled to record on
History, it often picks one of these channels to record on.  Is there
something I can set this to to permanently mark these channels as
channels for which no listings are available, or should I just set
visible = 0 and not worry about it?

Eric