Re: Siemens card and SPDIF

[Szymon Polom <polom@convergence.de>]

Hi...

Peter Hofmann wrote:

> On Sep 19,  1:29, Lars Bensmann wrote:
> > Subject: Re: Siemens card and SPDIF
>  slots. Tough luck. But I guess, I'm getting a slight bit off topic.
> >
> > How is the card supposed to get the AC3-Stream? I guess cat mpeg2 >
> > /dev/video won't work then. But I'm certain that once this works it will
> > work with all the available tools (VDR, gVideo).
> >-- End of excerpt from Lars Bensmann
 
> You can't send the AC3 through the video device. The AC3 stream must go to the
> audio device. There are two programs (ac3play, www.alsaplayer.org; ac3spdif,
> URL posted on this list) that use the ALSA interface to output to the audio
> device's SPDIF connection.
 
> Klaus Schmidingers VDR's would have to be modified to use the ALSA interface.
 
> There is a program called dvdplayer-0.2 (DVD playback through DVB cards, URL
> posted on this list) that splits the VOB files on DVDs into an MPEG-2 video
> stream going to /dev/video and a audio stream that is downmixed to Dolby
> Surround by the ac3dec program (www.linuxvideo.org). ac3dec has to be replaced
> by ac3play or ac3spdif to get Dolby Digital playback.

You can use one of the available AC3 decoders and generate LPCM audio
and send it to the DVB card. Make sure, you have the newest drivers and
it works. You are able to use LPCM to AVPES conversion or send the LPCM
data as a PES LPCM stream. Sure, you don't have a digital output, but
downmixing should make some people happy too :-).

Bye... SP.

--
Szymon Polom                              polom@convergence.de
convergence integrated media GmbH         http://www.convergence.de
Rosenthaler Str. 51                       fon: +49(0)30-72 62 06 68 
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