[vdr] Re: AC3 over DVBs / only DVD with sound

[René Bartsch <rene@bartschnet.de>]

----- Original Message -----
From: <apieper@gmx.net>
To: <vdr@linuxtv.org>
Sent: Friday, February 22, 2002 8:50 PM
Subject: [vdr] Re: AC3 over DVBs / only DVD with sound


> -------- Original Message --------
> Subject: [vdr] Re: AC3 over DVBs / only DVD with sound (22-Feb-2002 13:52)
> From:    werner@suse.de
> To:      vdr@linuxtv.org
>
> > On Fri, Feb 22, 2002 at 12:29:07PM +0000, apieper@gmx.net wrote:
> > > -------- Original Message --------
> > > > >
> > > > > The only different here is the total audio DD bitrate:
> > > > > DVD: DD 384kbps
> > > > > VDR: DD ~420kbps
> > > >
> > > > Does ac3dec or ac3play work together with the A/V-receiver?
> > > > OK this requires a soundcard with S/P-DIF supported by ALSA.
> > >
> > > Never tried.
> > >
> > > But another PC (running Win98) with a creative sb live
> > > works good with my receiver when replaying dvd.
> > >
> > > I forgot to mention that i am using a dvbs-card v1.3
> >
> > Hmmm ... a test with ac3dec or ac3play would be nice, because
> > both tools uses little endianes (e.g. convert ac3 to
> > little endian) due most ALSA drivers are using little endian
> > for input.  Nevertheless the output on the S/P-DIF has to
> > be the natural bit oder aka big endian.
>
> Ups, what's 'little endian'?

Endian describes the sequencing of the bits. "big endian" (SPARC, ALPHA) is read from left to right (beginning with the highest bit)
and "little endian" (INTEL) is read from right to left (beginning with the lowest bit).

Rene
>
> > AFAIS the ac3 patch from Wolfi uses big endian and I suppose
> > that the S/P-DIF out from the DVB card is big endian because
> > it is possible to connect e.g. a TOS Link or a
> > professionel IEC 958 connector.
> >
> > Now the question is : how do you have connected the S/P-DIF
> > out of the DVB card to the A/V-receiver ... are you using
> > a soundcard as loop through and if so I suppose you're using
> > ALSA and alsamixer to control the soundcars I/O.  Maybe
> > alsamixer helps you to hear something.
>
> No soundcard loopthrough, there even is no soundcard in my vdr-box.
> I am using a direct connection from J2 SPDIFF-out to my a/v receiver
> (ok, in between there is a koax->opto converter, but for testing i
> removed him - only dvd-ac3 either).
>
> Maybe i should investigate if my receiver is capable of replaying the
> higher bitrate of vdr-recordings altogether.
>
> Is there anybody on this list who has a working playback of vdr-ac3-recordings
> through a yamaha-receiver, especially a rx-v595?
>
> ...Andreas
>
>
>