[linux-dvb] DVB file formats

Andrew de Quincey adq_dvb at lidskialf.net
Thu Jun 16 15:01:14 CEST 2005


On Thursday 16 June 2005 13:54, Felix Domke wrote:
> Andrew de Quincey wrote:
> > On Thursday 16 June 2005 13:29, Felix Domke wrote:
> >>We have a special per-service flag, which has a meaning like "no DVB
> >>service". If this flag is set, there will be no attempt to parse any DVB
> >>tables, and just take the ES-Pids. We then invent a random SID, thus
> >>having an arbitrary es-pid-combination which behaves like a service.
> >>With this, we support stuff like feeds, with only minimal changes.
> >
> > Do you mean stuff like a feed from an mpeg2 encoder?
>
> With "feeds" I generally mean services which are setup to just transport
> a video/audio stream over a satellite, not meant to be used by the user,
> but for example to transfer raw, uncut footage or something to the studio.
>
> Sometimes they are encrypted, but most of the time they just use obscure
> parameters so nobody finds them ;)
>
> They are MPEG2, as usual, but most of the time they have varying SIDs or
> even no PMTs at all.

Oh I see! Interesting - I will have a think about that. 

> > I've got something like this as well. In the new format, I was thinking
> > you'd create a new multiplex, and have a new delivery type... e.g. for a
> > v4l source you might have
> > [multiplex]
> > source_id = Asomething
> > delivery = v4l <v4l specific parameters>
>
> So that would be a multiplex carrying analog video?

It was actually for mpeg2 encoder cards that spit out TS streams. Those cards 
have multiple inputs, so there was a multiplex corresponding to each input, 
and a single service for each.




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