[mythtv-users] Mux-shifting. DVB-T retune

Klaas de Waal klaas.de.waal at gmail.com
Wed Mar 4 13:39:20 UTC 2020

On Wed, 4 Mar 2020 at 12:48, John Pilkington <johnpilk222 at gmail.com> wrote:

> Today some of the multiplexes that I use were changed as part of the 700
> MHz clearance programme.  I knew it was coming, but details seem to be
> not readily available these days;  the assumption is clearly that the
> process will be handled automagically.
> I'm running current master, and the rescan seemed easy - thanks, Klass.
> I did my usual 'all known and linked transports' scan, deleted empty
> transports, and repeated until things seemed stable.
> But I couldn't watch BBC ONE as channel 1.  The EPG showed it there, but
> also at channel 4166, where it was watchable.  The log from scanning
> explained this.  Some 50 of 137 channels had similar changes.
> After deleting all EIT channels and rescanning, I think it's back to
> normal, and the EPG is being repopulated.  The channels of old
> recordings in the Watch Recordings screen look OK.
> Now for the box with DVB-T2 as well.  ISTR that those muxes may not have
> the link info.
> One new feature implemented in the current master (and in v31) is that
existing channels should survive being moved to another multiplex in a
rescan. This is rather difficult to test and it could be that it might not
be working as expected. For this to work the service ID of the channel has
to stay the same and it could be that this is changed also, i.e. the new
BBC One has a different service ID than the old BBC One.
What has happened in your case is that the new BBC One is not identified as
identical to the old BBC One and because the channel number 1 is already in
use the new BBC One gets the service ID as channel number.
If the service ID's of the old and the new BBC One are different then this
is the expected behavior.
If you still have the log of mythtv-setup then please send it, maybe it
gives new insights in the actual behavior of the channels scanner.
Logs created with the "-v chanscan" option are the most useful.

In the meantime, deleting all channels and scanning again is a good
strategy because, new in v31, the deleted channels are kept alive in the
twilight zone so that all existing recordings can be shown with the channel
What you lose with deleting and creating the channels is the manually added
information such as xmltvid, visible or not, and changes to callsigns and
channel names.

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