[mythtv-users] New frequency for NY NBC OTA channel 4

Michael T. Dean mtdean at thirdcontact.com
Wed Apr 4 11:12:21 UTC 2018

On 04/03/2018 06:38 PM, Tom Dexter wrote:
> On Tue, Apr 3, 2018 at 4:42 PM, Michael T. Dean wrote:
>> On 04/03/2018 02:23 PM, Tom Dexter wrote:
>>> The ugliest part was that all my recording rules and recording history etc
>>> had the wrong chanid and station (callsign). The station in my case is
>>> important because I've used the "this channel" filter a lot. The callsign
>>> had changed to WNBC and it was WNBC-DT before. Obviously it also had a new
>>> unique chanid. I manually updates both chanid and station on the tables
>>> record, record_tmp, and oldrecorded to the new values.
>> This is why the channel call sign is a user-editable field.  It is meant as
>> a user-specifiable channel uniqueness identifier--so you can assign the same
>> call sign to all your various channels that are the same channel (whether
>> that's due to changes over time or due to variations across different
>> inputs).  All you had to do was change the call sign on the new channel to
>> WNBC-DT and all your rules would have worked, even though you used the "this
>> channel" filter, without your having to do any direct manipulation of
>> recording tables (including ones you edited that didn't need editing, but
>> that's another story).
> One quick question on this one: As noted above the scan created a new
> channel for 4.1 with the new frequency, and I used the channel editor
> to delete the old one.
> Had I edited the callsign on the new channel, would the recording
> rules on the recorded table have worked despite the fact that they had
> a chanid for the old channel that I had deleted in the channel editor?
> I'd assume so based on the fact that the actual rule is for any
> channel...just with a filter for "this channel" based on the callsign.

Exactly.  The filter uses a station ID which is a copy of the channel's 
call sign at the time of rule creation.  It does not use the channel ID 
nor any of the data in the channel referenced by the channel ID so that 
your channels can change without affecting how your rules work (which, 
by the way, is different from saying "without affecting whether your 
rules work").

As for the next scan picking up the right call sign, that might be the 
case, but make sure you check.  At least around here, they seem to 
change what they transmit all the time--even though the call 
sign/network name doesn't change--whether it's putting in garbage 
characters or modifiers (like "-DT" or "-HD" or "-D1" or ...) or 
changing modifiers (from "-DT" to " DT" or "DT") or trying to make more 
clear/related or symmetric the naming of the various subchannels on the mux.


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