Tvheadend

Hi. Wondering if anyone knows how OTA EPG works? I am just looking to optimise my scans.

As I understand it, some providers send all the data for all channels on all muxes. Some send all the data for all on channels on only one mux. Some just send the now playing/next for a channel on the channel.

Is there any way to see where my epg data is coming from? At the moment I have all muxes being scanned and I'd really like to only be scanning whats needed and do it more frequently. I have several satellites, OTA and cable set up, so lots of channels.

To clarify, i'm not asking for support as such, just a way to know for sure which muxes need scanning and which do not. I'd rather not rely on google info as we all know that stuff gets moved around from time to time.

Cheers,
Chris