[mythtv-users] channel musical chairs

Ross Boylan rossboylan at stanfordalumni.org
Fri Dec 1 18:21:11 UTC 2023

On Mon, Nov 27, 2023 at 12:47 AM Stephen Worthington
<stephen_agent at jsw.gen.nz> wrote:
> The serviceid values normally stay the same when a channel moves
> frequency.  They are supposed to be unique across all the channels
> that are able to be received at any site, and are usually unique
> across an entire TV system.  So when moving a channel to another mux,
> the serviceid normally does not need to be changed.

This is definitely not the case in the US with ATSC.  The serviceid
appears to have been set from the "program #" used to pick out streams
being broadcast on the same frequency.  They are typically low
numbers, like 1-5, for each distinct frequency.  So when an individual
subchannel, like virtual 4.1 (I'm not sure if technically 4 is the
virtual channel or 4.1) moves to another frequency it often needs a
different, low, number.  But, as I found and others have said, it
seems to be informational only.


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