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

[Rolf Hakenes <hakenes@hippomi.de>]

Carsten Koch schrieb:
> 
> 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?
> 
Correct...

> * 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?
>
Easily...yes...quickly...more or less (within a few seconds)...
 
> Does the same also apply to the Teletext PID and the AC3 PID?
> 
The same applies. It#s all part of the DVB-SI information transmitted by the
channel.

Best regards,

Rolf


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