On Thu, Jun 16, 2005 at 03:27:43AM +0100, Andrew de Quincey wrote: > On Thursday 16 June 2005 01:58, Robert Schlabbach wrote: > > Why not merge channels (I'd prefer the DVB term "services") and transponder > > (locator) information in one section then...? Might be better to keep them > > together anyway. ... > As for channel->service - if thats the DVB standard, it would make sense to > move to that I agree. Its a pity they don't have a standard name to describe > the concept of a transponder across all media types though :) I would prefer "service", too. How about "multiplex"? Mostly used for dvb-t, but IMHO more generic than "transponder". > > Then you have to find a way to satisfactorily reference services. DVB's > > ONID:TSID:SID may not be sufficient, as e.g. here in Germany, ASTRA > > satellite transponders are fed into the cable networks with exactly the > > same ONID:TSID:SID's, so a preset file using only that would not allow > > selecting whether the service is to be received from cable or from > > satellite (if both are available)... OTOH, services might move and their > > ONID:TSID:SID might change, but it will still be the same service. For such > > cases, referencing the service name would be better, but some service names > > can be found several times, e.g. I think there are a couple "Bloomberg"'s > > on ASTRA 19.2?E... Maybe the presets file should contain ONID:TSID:SID > > _and_ service name (and maybe network and provider name) and even the > > adapter ID, so that the application can then look for the closest match. > > Duplicate channels on seperate sources are not a problem as each transponder > knows what source it is from. But yes, identifying duplicate channels from > the _same_ source are a problem you are right. > > Previously I've used a combination of the frequency, the polarization, the > ONID, TSID, and SID in order to uniquely identify a service. Not nice :( The purpose of the network_id is to differentiate services in this case. (But you still can't rely on the broadcasters to assign correct/unique ids.) Johannes
