[linux-dvb] DVB file formats

Manu Abraham manu at kromtek.com
Thu Jun 16 14:32:49 CEST 2005


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.
> 

Are there any cases that you or somebody else has seen Original Network 
ID not to exist or the same like the case seen with service_id as Andrew 
and Christopher stated ...

I believe TS_ID also would be unique in that case to be referenced in 
hierarchial manner..

> 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.
> 

I understand what you meant.. That either one of them or a combinaion of 
them need not be unique .. ?

Manu




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