[linux-dvb] Re: DTV - New (minor) Release 1.1

[Carsten Koch <Carsten.Koch@icem.de>]

Rolf Hakenes wrote:
....
>    - enabled 'dtv_scan' to generate a VDR-compliant 'channel.conf' file
>      ** Comment to this feature: Due to the nature of DVB broadcastings
>         'dtv_scan' cannot garantuee to find all channels as VDR needs them
>         to know. For NVOD and Linkage channels (PW Cinedom/Superdom/F1) only
>         the main channel can be found (which is not very interesting for VDR,
>         as it contains no audio/video stream). Additionally only channels that
>         broadcast at the moment of the scan are scanned with the correct
>         audio/video PID. All this is due to the fact, that the standard
>         specifies only the service PID (called pnr in VDR) as the unique
>         identifier for a channel. Audio and video PID are just temporary
>         numbers, which are known to the receiver through parsing the
>         appropriate PMT table (part of DVB-SI information stream).

Hi Klaus and Rolf,

if I interpret the above correctly, 

* the PNR/service PID is the unique identification of a channel?

* APID and VPID are temporary (not guaranteed to remain the same)
  and can easily and quickly be retrieved as long as we have 
  a transponder frequency, polarization, symbol rate and PNR?

Does the same also apply to the Teletext PID and the AC3 PID?


Carsten.


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