[vdr] Aw: Re: Direct AC-3 yes or no ?

[peter.zeipelt@arcor.de]

@Werner

Thanks for the explanation. 
At first I had some difficulties to understand why you first mention the syncproblem using a soundcard and then you say that there are no problems using the sp-dif out even with a soundcard as router.
But if I get you right, the problems are caused by the pci-transfer and there are eliminated
bypassing the pci-bus with the sp-dif connection.

@Stefan
Thank you for your hint.
I've been on your website before baut haven't looked into the downlowd section.
Now I've patched my vdr-1.2.1.
The new menu-items appear and I set them up as you told.
Multichannel=yes
DD/DTS=yes
But there's still only the pcm-signal.
To be sure if there is a problem with the DD-PID I made a recording.
Playing the recording back my amplifier turns to DD.
Do you have any idea?

Peter

----- Original Nachricht ----
Von:     "Dr. Werner Fink" <werner@suse.de>
An:      vdr@linuxtv.org
Datum:   16.07.03 17:27
Betreff: [vdr] Re: Direct AC-3 yes or no ?

> On Wed, Jul 16, 2003 at 05:07:06PM +0200, peter.zeipelt@arcor.de wrote:
> > Hi
> > 
> > ----- Original Nachricht ----
> > Von:     "Dr. Werner Fink" <werner@suse.de>
> > An:      vdr@linuxtv.org
> > Datum:   16.07.03 16:56
> > Betreff: [vdr] Re: Direct AC-3 yes or no ?
> > 
> > Thank you for this very fast answer.
> > You show me the problems of this solution, but as I can see, it
> > seems to be interesting.
> > Unfortunately I have no experience in C and my last programming
> > activity in pascal
> > is about 10 years ago.
> > However, if it's an opportuny to fix some problems (e.g. your
> > mentioned synch problems)
> 
> The synch problem is due to the different time reference of e.g. Pro7
> and the clock/quart of the sound card.  This leads to the problem that
> 48kHz from live view isn't 48kHz from the sound cards reference clock.
> 
> In fact you get underuns (sound card clock to fast) or overruns (sound
> card clock to slow).  Only sound cards which could use the S/P-DIF intput
> as reference clock (some very expensive cards can do so) and if you've
> put the S/P-DIF (5V TTL!) out of the DVB card to the S/P-DIF in of the
> sound card (hopefully able to handle 5V TTL) do not have this problem.
> (Similar problem you get with two different sound cards! No quart/clock
> is exactly in synch with each other!)
> 
> If you using the S/P-DIF out of DVB card the synch problem is gone
> even if a sound card is used as S/P-DIF router.
> 
> > and brings some new benefit, don't you think that the programmers
> > might bring it in the future?
> > 
> 
> It would be a pleasure but, ... as I've noticed ..., none of the
> firmware programmers do have an AC3 receiver or arn't interested
> on hearing AC3 over DVB card.
> 
>               Werner
> 
> 
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