Re: Distortion via SPDIF

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On 18/12/2007, at 9:52 PM, Paolo Saggese wrote:

> may be you're having sample-rate mismatch problems?
>
> DTS/AC3 streams are usually 48KHz/24bit, while FLAC are most
> often 44.1KHz/16bit (CDDA).
>
> Perhaps your card is set for (or may do only) S/PDIF out at
> 48KHz, and you are trying to play a 44.1KHz stream at 48KHz
> without resampling?

Paolo,

When I play a 48 KHz DTS file, my HT receiver displays "PCM 48 KHz";  
when I play a 44.1 KHz FLAC file, it displays "PCM 44.1 KHz", so my  
SPDIF output seems to be sending the correct sample rate.

Interestingly, when I use mplayer to decode my DTS test file and play  
via SPDIF, it comes out distorted. If I tell mplayer to use DTS  
passthrough on the same file, it sounds perfect.

I tested playing the same files as decoded PCM via the optical SPDIF- 
out on my laptop (Mac OSX, not ALSA) into the same receiver and it  
played perfect, so its nothing on the receiver/HT end.

Any other ideas?

Thanks,
Tom


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