[mythtv-users] capture card setup, audio device options

Alan Calvert cal at graggrag.com
Sat Mar 17 00:27:29 UTC 2007

Mythtified wrote:
>> On 3/16/07, Alan Calvert <cal at graggrag.com> wrote:
>>> A naive little question - the only options I'm seeing for audio device
>>> selection in capture card setup are the dsp's (ie, no alsa/jack). Is
>>> that normal?
>> Michael Lynch wrote:
>> Yes, but it is also a free-text area, meaning you can type whatever
>> you'd like in those boxes.
> Note the input device for capture cards can only be an OSS device 
> (/dev/dspX). If you look in the source code you can see there are lots of 
> classes for frontend audio out (OSS, ALSA, JACK, etc...) but there is only 
> one input class for backend capture - OSS. If you type an ALSA device in the 
> free-text field there, you won't get any sound.
> If I knew more about combining an AC3 stream as audio with an MP4 I'd take a 
> crack as adding ALSA to backend capture. I have an STB with COAX/Optical 
> audio out (DCT2525), and a sound card with COAX/Optical in. Would be nice to 
> capture S/Video and AC3 rather than just basic stero. 

Good answers, thank you all! I think I'm getting my head around it. 

cheers, Cal

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