[linux-dvb] DVB file formats

Johannes Stezenbach js at linuxtv.org
Thu Jun 16 13:45:58 CEST 2005


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.

Johannes




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