[mythtv-users] ALSA Digital output

Peter Osterberg peter at supergirl.se
Wed Aug 24 11:58:18 UTC 2005

Typo correction, the card is of course a Intel 82801EB/ER (ICH5/ICH5R) AC97

Grand typo but anyway... =o)

At 13:54 2005-08-24, you wrote:
>Don't know for sure if this question can be posted here, please ignore if 
>you feel it could not.
>I want to use digital output on my soundcard. The card have both an 
>optical and coax connection the card is a Intel 80801EB/ER ICH5 AC97.
>So this is what I've done so far. Checked out alsamixer and found settings 
>that seem interesting IEC958 and IEC958 Playback. IEC958 can't be changed 
>in any way neither can the level be changed nor can it be muted. IEC958 
>Playback level can be changed at 4 specific positions 0, 33, 66 and 100%. 
>This all I can find in alsamixer that has to do with digital output. I've 
>connected both the optical and the coax outputs to the corresponing inputs 
>on my amplifier and it detects NO digital signal. So I downloaded a lot of 
>different mixer to see if anything made me lucky. In a mixer called 
>opmixer there is a setting called dig1, if I unmute this on I get PCM 
>48kHz detected on my amplifier but it doesn't seem stable since my amp 
>loses it for short moments every now and then.
>After digging thru some material I found that sound have to be directed 
>directly for digital output via a specific hardware option in i.e. mplayer.
>mplayer -ao alsa:device=hw=0.0 is the correct setting for analog output
>mplayer -ao alsa:device=hw=0.3 should be the correct setting for digital 
>Well I get no sound what so ever when using the digital output options in 
>mplayer even though me amp has detected a digital signal.
>Does anyone know? And an upcoming question will be how I change whether to 
>use optical or coax, for now I only get signal detected when using coax.
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