[linux-dvb] Re: Reception of raw TS or multiple PIDS

["Rene Bartsch" <linux-dvb@bartschnet.de>]

 ----- Original Message -----
 From: "Robert Szelepcsenyi" <robert@tankred.sk>
 To: <linux-dvb@convergence.de>
 Sent: Thursday, February 06, 2003 10:44 PM
 Subject: [linux-dvb] Reception of raw TS or multiple PIDS


 > Hi,
>
>
> I am looking for a DVB-SAT card that is supported under Linux and that
would
> allow me to:
>
> 1. receive raw transport stream (after error correction & before
> demultiplexing) or
> 2. receive several programs with PIDS I can specify.
>
> My goal is to build a device that would allow me to receive several radio
> programs broadcasted over satellite in one multiplex and stream them over
> Internet (LAN) or pipeline them into CATV.
>
> It seems to me that Skystar 1, which has a good support under Linux, has a
> built-in demultiplexer, that most probably cannot be bypassed, so the
> extraction of raw TS may be impossible.
>
> On the other hand Skystar 2, which might be able to do it (although I am
not
> sure), seems to have a questionable support under Linux. I have been able
> to
> find a compiled Linux module for this card, but I have no idea of its
> capabilities and how it interfaces to other applications.
>
> I am asking about these two cards, because these are the only PC hardware
> for DVB-SAT I have been able to find in stores around my place.
>
> I will be very thankful for any information that will help me to achieve
the
> above goal (if it is possible at all).
>

 There are two major layouts supported by the DVB-driver:

1.) Technotrend DVB-S/C Rev. 1.3, 1.6 and 2.1 (is Skystar1 with
MPEG-decoder)
     (OEMs from Siemens, Galaxis, Hauppauge)
     That cards have a tuner frontend which is connected to the SAA7146 by a
AV711x with DEBI-port (maximum bandwith 45 MBit/s)
     They have an MPEG-decoder, OSD and CI-interface

     Drawbacks:  No TS-support (the firmware can demultiplex a TS and
remultiplex up to 8 PIDs into a Pseudo-TS)
                         Firmware very unstable, AV711x is to weak for
reliable processing of timeshift and multiple PIDs, very expensive.

2.) Technotrend budget cards (like TT-budget, Hauppauge WinTV NOVA, Satelco
Standard DVB PCI)
     With this cards the tuner frontend is directly connected to the
SAA7146 -> You can receive a full TS from satelite - and it has no firmware
crashing and causing trouble with NDAs.

     Drawbacks: No MPEG-decoder, OSD and no CI (only NOVA-S CI,
butmCI-interface is not supported by driver)

The SKYSTAR2 is a low-budget layout, but has it's own tuner-frontend,
chipset and binary driver with own API. So you don't get any information on
the driver, can't do debugging an it's incompatible to the DVB-API in
Linux-kernel.

If you don't need CI-interface I suggest you to use a TT-layout low-budget
which would fit your case.

 If you want and MPEG-decoder and OSD additionally you should use a DXR3
with a low-budget.

 For your streaming of radio, I suggest you to use VDR with low-budget cards
and mod the stream-plugin to provide several streams.

 Rene
lin



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