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On August 9, 2004 09:30 pm, Eric Jorgensen wrote:
> On Mon, 9 Aug 2004 19:25:48 -0300
>
> James Oakley <[EMAIL PROTECTED]> wrote:
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> > On August 9, 2004 09:45 am, Eric Jorgensen wrote:
> > > > > �I *do have an amp to receive AC3 streams, but i haven't yet
> > > > > tackled that. Currently my freevo system is a VIAC3, but so far i
> > > > > haven't found a way to get it to transmit anything but 48khz PCM.
> > > >
> > > > Put "-ac hwac3,mad, -srate 48000" in your MPLAYER_ARGS_DEF.
> > >
> > >    It's the -srate argument i kinda have issues with. The specs from
> > >    VIA
> > > for their chips imply that late enough versions (like mine) should not
> > > be restricted to 48khz. Support for this exists in late versions of the
> > > OSS driver, which, does not support digital out.
> >
> > IIRC, a DD amp will expect a 48kHz sample rate. Any other rate won't play
> > at the correct speed. Some hardware will resample the signal for you
> > automatically. My CMI8738 resamples *some* rates. Other hardware will
> > have drivers that perform the resampling. Some will happily pass the
> > wrong rate and it will sound odd. My brother's ALC650 passed 44.1kHz
> > audio without resampling which sounded slightly sped up.
> >
> > The -srate option in Mplayer will solve all of these problems.
>
>    Well, you're wrong, in part.
>
>    I'd been using -af resample, or something. I'm not sure, that box is
> offline right now.

- From what I can tell from the man page, -af resample will always resample. 
- -srate will leave a 48kHz stream alone.

However, neither option should have any affect on an AC3 stream as long as you 
use the '-ac hwac3,' option, which will pass the stream unaltered to the 
spdif output. That's what you were having trouble with, right?


>    I'm not saying the quality was unacceptable. I'm saying i am
> intellectually and aesthetically irritated by the concept.

Resampling a stream to 48kHz is very trivial in software. Picking the closest 
IEC958 rate and resampling to that in hardware isn't nearly as trivial. Why 
make it complicated?

Put a CD in your DVD player and play it. What does your amp say?

- -- 
James Oakley
[EMAIL PROTECTED]
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