[vdr] Re: DD AC3 and 1.3.19 broken?

["Kent Nielsen" <Kent.Nielsen@microlink.ee>]

Thank you,

Have to say, it is really good answer, but I can't conclude what should
be done (can anything be done)?

I'm using full-freatured DVB card (rev. 1.5).  So the first problem is
not my problem? ("in the firmware of the FF DVB card I've not found any
way to set the non-audio bit in the status of the S/P-DIF stream").

So my problem is in the DTT3500 receiver, it does not scan for the
magics
shorts defined in ISO/IEC61937.  As it works with bitstreamout plugin,
wouldn't it be wise to include that functionality in VDR also?

BR,

Kent

-----Original Message-----
From: vdr-bounce@linuxtv.org [mailto:vdr-bounce@linuxtv.org] On Behalf
Of Dr. Werner Fink
Sent: Friday, February 04, 2005 5:56 PM
To: vdr@linuxtv.org
Subject: [vdr] Re: DD AC3 and 1.3.19 broken?

On Fri, Feb 04, 2005 at 04:13:47PM +0100, Joerg Knitter wrote:
> Bernhard Stegmaier schrieb:
> >Hi!
> >
> >On Fri, 2005-02-04 at 15:59 +0200, Kent Nielsen wrote:
> >
> >>When I switch to DD (Pro7) I only hear very high creaking from my
> >>Cambridge Soundworks DTT 3500 (sound card Audigy Platinum connected
> >>through Digital DIN).
> >>I have spdif cable connected from DVB - SoundCard.
> >>
> >>It used to work fine with bitstreamout, but unfortunately this
plugin
> >>can't be used anymore.
> >>
> >>Never tried the AC3ovdrDVB patch, because bitstreamout worked fine.
> >
> >Only to mention (and to eventually save you some time)... I also have
> >the DTT3500 and had tried the AC3OverDVB-Patch (but probably over a
year
> >ago with some 1.1.? VDRs)... that didn't work for me (no sound) -
> >whereas the bitstreamout did work.
> 
> Then, the DTT3500 does not seem to support AC3 encapsulated in PCM 
> frames. AC3overDVB does it like this while bitstreamout uses 'real' 
> AC3-Frames.

No ... the bitstreamout plugin uses the same technique (ISO/IEC61937).
With this you embbed the coded data into a PCM stream.
The only difference is the S/P-DIF stream used for transport the
PCM stream. With a good sound card you can open the S/P-DIF interface
as non-audio, in the firmware of the FF DVB card I've not found any
way to set the non-audio bit in the status of the S/P-DIF stream.

All receivers which do not scan the PCM data for the magics
shorts defined in ISO/IEC61937 even if the S/P-DIF stream
isn't marked as non-audio simply loose.


           Werner

-- 
AC3 loop through sound card http://bitstreamout.sourceforge.net/
Howto http://www.vdr-portal.de/board/thread.php?threadid=1958
------------------------------------------------------------------
 "Having a smoking section in a restaurant is like having
         a  peeing section in a swimming pool." -- Edward Burr