[Mplayer-dvb] Re: How to do a central DVB-S Server for a community network ?

[Arpi]

Hi,

> > One thing that you are missing I think is that a single DVB receiver card
> > is capable of grabbing more than one station at a time - in principle all
> > the stations in a single multiplex (ie muxed together on the same
> > frequency) can be handled at the same time.  So I don't think you'll need
> > as much hardware as you imagine.
> 
> I had no idea ! its hard to believe also, because this would result in huge
> streams coming out of one card ? i can receive 120 TV and 300 radio stations
> with my Pinnacle DVB-S card, and AFAIK the Astra DVB-S will all use the same
> transmitting frequency ?

heh? no. one freq has ma xup to 8 channels.

> If we estimate a TV station to be 3000 kbps and every radio station 240
> kbps, this sums up to 450 mbit/s ?? Probably a bit too much for a simple PCI
> slot :-) ?

the bandwith of a single transpoder (single freq with given polar) has
27mbit. wiht avg 3-6 mbit/channel it's up to 8 channels per each.

astra is a satellite, with many transpoders...

> So, to be able to render about 40 TV stations, how many cards were
> reallistically necessary ?
it depends on teh channels. if they are grouped to a few transpoder - you're
lucky and in optimal case it's 40/8=5.
in worst case, all eh 40 channels are on different transpoders, so you need
40.

> > For your servers you probably want the cheaper "Budget" DVB-S cards -
> > which have the advantage of access to the entire transport stream as
> > transmitted.  On the other hand, these cards don't support CAMs - perhaps
> > you need that for your application.
> 
> CAM ? sorry, you mean CIMs, for PayTV ?
CIM ? sorry, you mean CI ? :)

> Unfortunately the client side would have to be covered with a Windows
> solution, as this is targeted to normal people, and these are 99% Windows
> users ( if they ever know how to switch on a PC of course ).
so why the hell are you asking the question here???


A'rpi / Astral & ESP-team

--
Developer of MPlayer, the Movie Player for Linux - http://www.MPlayerHQ.hu