[linux-dvb] DVB file formats

Andrew de Quincey adq_dvb at lidskialf.net
Thu Jun 16 13:55:12 CEST 2005


On Thursday 16 June 2005 12:45, Johannes Stezenbach wrote:
> On Thu, Jun 16, 2005 at 02:10:10PM +0400, Manu Abraham wrote:
> > Is service_id supposed to be unique in a bouquet too ? or is it only in
> > a transponder ?
>
> ETSI TR 101 211 says (4.1.1 Network Information Table (NIT) information):
>
> "The SI uses two labels related to the concept of a delivery system,
> namely the network_id and the original_network_id.
> The latter is intended to support the unique identification of a
> service, contained in a TS, even if that TS has been
> transferred to another delivery system than the delivery system where it
> originated. A TS can be uniquely referenced
> through the path original_network_id/transport_stream_id.
> A service can be uniquely referenced through the path
> original_network_id/transport_stream_id/service_id. The
> network_id, thus, is not part of this path.
>
> In addition each service_id shall be unique within each
> original_network_id. When a service (contained inside a TS) is
> transferred to another delivery system, only the network_id changes,
> whereas the original_network_id remains
> unaffected."
>
> However, in practise you cannot rely on this.

Is it worth supporting bouquets in the file formats do you think? None of the 
other formats support them, and from what I've seen of satellite receivers, 
they don't seem to bother with them much either (although that may admittedly 
be distorted by Sky's stranglehold on the UK DVB-S market).





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