[mythtv] Regarding EIT

[Stuart Auchterlonie]

On 22/06/2010 10:06, Per Heldal wrote:
> On 22/06/10 10:51, James Courtier-Dutton wrote:
>> On 22 June 2010 05:59, Tyler T<tylernt at gmail.com>  wrote:
>> DVB does not need to do sub-channel scan.
>> All the EIT information for all channels on a single mux use a single PID.
>
> Not only that, but some broadcasters have dedicated SIDs for long-term
> EIT data on one mux covering all their muxes. Ex: Canal Digital (Telenor
> Nordic) only provide current+next program on individual muxes, with
> 7+days of EIT on one particular mux. Currently SID 1021 on txp A15
> (http://no.kingofsat.net/tp.php?tp=5201)
>
> Is there a generic method to detect such sources which could be used to
> improve the scanner?
>

There are several different variation of EIT data delivery implemented
in the wild.

#1 - Specific EIT mux as mentioned by Per above. Commonly found in DVB-S.

#2 - Fully cross carried EIT data. All muxes carry full 7 day EPG for
all muxes. Found in UK DVB-T.

#3 - Non cross carried EIT data. Each mux carries the full 7 day EPG for
channels found on that mux.


We really only support the last two properly at the moment, as the
current scanning mechanism tries to walk each mux as quickly as
possible to get data from each one (best for #3).

There is normally signalling available in the DVB tables that tell
us where the EIT mux is located and the scanner should use this in
DVB-S scenarios.


As mentioned by Daniel in another reply on this thread the data
repetition rates vary by how soon the program will air.

Now/Next - HIGH
0-3 days - MEDIUM
4-7 days - LOW


Regards
Stuart Auchterlonie