2019-07-05, 09:00 AM
Over the last 6 Months or so there have been various NPVR users in the UK with epg update problems, which either caused crashing during EPG update or large amounts of "No Show Details" throughout the logs.
Recently after re-allocating 2 of 6 tuners to v5 testing it returned with a vengeance.
After investigation, I discovered that there was only one frequency left in the advanced EPG setup screen (Misc 2) which would not populate again with re-scanning the devises.
The only way I found was to bulk map all channels to none, followed by going in to each channel details and resetting epg source to DVB/ATSC (there is a bug or feature, where doing this in bulk mapping is not saved).
It looks as though every time there is a frequency change for a mux,(there have been 4 in the last year and a bit, here on Mendip) a rescan updates the frequency for the channels, but not the source for the epg in Channels - NPVR can probably cope with one frequency missing due to the all channels being broadcast on every mux, but as the number of frequencies changed increases there will be more holes in the guide, due to the time required for a full cycle of all channels on one mux being around 12 minutes.
There was also a problem - may still be - with spurious illegal Characters.
Recently after re-allocating 2 of 6 tuners to v5 testing it returned with a vengeance.
After investigation, I discovered that there was only one frequency left in the advanced EPG setup screen (Misc 2) which would not populate again with re-scanning the devises.
The only way I found was to bulk map all channels to none, followed by going in to each channel details and resetting epg source to DVB/ATSC (there is a bug or feature, where doing this in bulk mapping is not saved).
It looks as though every time there is a frequency change for a mux,(there have been 4 in the last year and a bit, here on Mendip) a rescan updates the frequency for the channels, but not the source for the epg in Channels - NPVR can probably cope with one frequency missing due to the all channels being broadcast on every mux, but as the number of frequencies changed increases there will be more holes in the guide, due to the time required for a full cycle of all channels on one mux being around 12 minutes.
There was also a problem - may still be - with spurious illegal Characters.
It's not an overly complicated system - it's more - overly simple operatives 
