[linux-dvb] DVB file formats

Andrew de Quincey adq_dvb at lidskialf.net
Fri Jun 17 01:11:53 CEST 2005


On Friday 17 June 2005 00:10, Andrew de Quincey wrote:
> > [Presets]
> > Number=ONID:TSID:SID
> >
> > e.g.
> >
> > 1=1:1101:28106
> >
> > Now this could definitely be more sophisticated, e.g. to allow several
> > presets groups. A simple extension would be:
> >
> > [Presets.Default]
> > ...
> >
> > [Presets.Sports]
> > ...
> >
> > [Presets.News]
> > ...
> >
> > This could even be taken several levels deep:
> >
> > [Presets.Movies.Action]
> > ...
> >
> > [Presets.Movies.Horror]
> > ...
>
> I can't think of a better/clearer structure than this - I've put an example
> up on the wiki:
>
> http://www.linuxtv.org/wiki/index.php/File_Format_Comparison#Ideas_for_a_pr
>esets_file_format
>
>
> Now however, the multiplex differentiators are the problem (for
> distinguishing between transponders with the same IDs). Does anyone have
> any suggestions as to good numbers to use?
>
> Obviously they have to be based on the frequency somehow, but they also
> have to take into account tuning varaiations between people's systems (e.g.
> different LNB drifts).
>
> The first thing that springs to my mind is something like the following:
>
> DVBS: ((frequency / (symbolrate/1000)) << 1) | polarisation
> DVBT: (frequency / bandwidth)
> DVBC: (frequency / symbolrate)

Doh - hit the wrong key! :(

However, I have a suspicion this is rather a naive solution. Does anyone have 
any suggestions for doing this?




More information about the linux-dvb mailing list