[vdr] Re: SV: Re: SV: Re: Needed: Step by step guide for AC3 over Soundcard

["Dr. Werner Fink" <werner@suse.de>]

On Sat, Oct 16, 2004 at 11:30:39AM +0200, Mattias Viberg wrote:
> I'm using the onboard soundcard (AC97, 6 channel) of my ABIT VA-10. 
> I have made some tests and i can play a regular sound file through the
> spdif (aplay -D spdif) but when I try to play an ac3-file I get:
> 
> linux:~ # ac3play SURROUNDTEST_DD_640.wav

Please play only AC3 files and never WAV files with ac3play.

> ALSA lib pcm_hw.c:976:(snd_pcm_hw_open) open /dev/snd/pcmC0D2p failed:
> No such device
> open: No such device
> error openning digital output

Two possibilties: maybe your soundchip has no S/P-DIF out and/or
the ALSA driver doesn't know about a S/P-DIF out and is not able
to open the interface.

> 
> I'm using ALSA 0.9.0 (standard on SuSe 8.2). I have'nt setup anything
> with amixer or a mute-script.
> 
> Also, when I'm watching channels with analog sound, I get sound through
> the spdif but it is totally out of sync. /var/log/messages gives me:
> 
> Oct 16 11:24:54 linux kernel: ALSA pcm_lib.c:1938: BUG? (noise_dist <=
> (snd_pcm_sframes_t)runtime->silence_threshold) (called from c20ba0b6)

IMHO you should try a newer ALSA driver version.

          Werner

-- 
AC3 loop through sound card http://bitstreamout.sourceforge.net/
Howto http://www.vdr-portal.de/board/thread.php?threadid=1958
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