[mythtv-users] "Cross Source EIT"

Nick Morrott knowledgejunkie at gmail.com
Sun Mar 4 18:42:08 UTC 2007

On 04/03/07, Tim Small <tim at buttersideup.com> wrote:
> Hi,
> I'm trying to find out some info about the "cross source EIT" option...
> I have:
> 1. A DVB-T terrestrial tuner (UK "Freeview"), which carries decent
> multi-week EIT info (but has slightly poor reception quality in my
> location).
> 2. A DVB-S satellite tuner with a fixed dish and single LNB (pointing at
> Astra2 28.2/Eutelsat 28.5 East), which carries "now and next" EIT info
> only (the full EPG on the network is in a Rupert Murdoch proprietary
> format).
> Since about 80% of the channels that I'm interested in are common to
> both sources, I'd like to use the detailed DVB-T EPG data for the DVB-S
> source, but I don't know how to go about doing this (if it's possible at
> all)?
> I found this:
> http://www.gossamer-threads.com/lists/mythtv/users/241465
> but don't know how to apply it to my setup.


I applied these settings to my configuration (DVB-T (preferred) and
ntl digital cable) to enable the radio listings from DVB-T to be
applied to my ntl video source.

After a short time (couple of days after having had no scheduled radio
recordings), listings on my DVB-T source - where the data was actually
coming from - started to disappear, and were only present on the low
priority ntl: source. I first noticed this when radio recordings went
from being scheduled on the high priority DVB source to the low
priority ntl source, which completely defeated the purpose of enabling
Cross-Source EIT (CS-EIT) on my system.

I had 9 channels configured to use the CS-EIT listings data. Once I
had enabled CS-EIT for a week (the length of listings data available
on my EIT source), listings disappared almost entirely from my DVB-T
source. Of the 9 DVB-T channels, only 1 channel on the DVB-T source
was updated with listings. All other CS DVB-T channels had _no_
listings data at all. On the low priority source, 8 channels were
updated with the data - the only channel omitted from updates was the
single channel on the DVB source that was still getting the EIT

Frustratingly, I had also changed from using the external tv_grab_dvb
application, which could apply DVB EIT listings data against _any_ of
my video sources, to using the then much-improved internal EIT

I'm not sure if this behaviour is specific to my setup, but I've
disabled this until I have another look at it. I also have no
experience of  whether you'll be able to mix DVB-T and DVB-S channel
setup due to the ways in which channels are configured.

As I understand the behaviour of CS-EIT from danielk's reply in the
linked thread, you enable cross-source EIT as the linked discussion
states, then update those channels you wish to receive the EIT
listings data (either in mythtv-setup or directly) with the DVB-T
channel-specific tuning information (mplexid, serviceid) for the
complementary channel on your DVB-T source.

I would have thought it easier to have an boolean option for channels
to enable CS-EIT on an individual basis, match CS-EIT-enabled channels
by xmltvid, and then update matching channels with the EIT data. From
the very odd way my first experience with CS-EIT went, I'll be sure to
keep my eyes upon for further posts regarding CS-EIT.

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