Re: Recording sound

From: Luca Pireddu (ilveroluca_at_n.o.s.p.a.m.hotmail.com)
Date: 09/17/04 

Date: Fri, 17 Sep 2004 16:17:20 GMT

myname wrote:

> Noi wrote:
>> On Thu, 16 Sep 2004 11:59:57 -0400, @(myname).com thoughtfully wrote:
>>
>>
>>>ObQuestion:
>>>Can I listen to mp3s while a script is recording whatever comes in
>>>line-in on the same sound card, and if so, how?
>>>
>>>
>>>I've been recording radio programs using my sound card's line-in, sox
>>>and lame to create low-bitrate mp3s and it works great.
>>>
>>>Problem is, using /dev/dsp as the source, it would seem that I can't
>>>listen to anything else without the line-in getting in the mix. It
>>>would seem like line-in could run through Analog-Digital conversion
>>>while mp3 could run through Digital-Analog without necessarily meeting
>>>along the way. Is there some limitation to sound cards (or this card)
>>>that makes this not possible?
>>>
>>>I'm using ALSA 1.0.2 on Mandrake 10.0 with a VIA VT8233/A/8235 AC97
>>>Audio controller (onboard)
>>>
>>>My Tivo can show one thing while recording something else, so I thought
>>>I'd ask. :)
>>
>>
>>
>> Play your mp3 shortly after Lame starts creating the file. I'd give it a
>> minute head start before playing the file as it is being created.
>
> Thanks for the reply, but I was actually referring to any arbitrary mp3,
> not necessarily the one that is being recorded. In any case they play
> just fine, but the sound card audio-out (the speakers) play both the mp3
> and whatever is coming in on line-in simultaneously like two radios
> turned to different stations. If I "mute" the line-in to hear just the
> mp3, then nothing but silence is recorded.
>

I have a tv card that I sometimes use to record shows. The audio is routed
through the line-in on my sound card (shows up as "Line" on my mixer). To
listen to something else while recording, I can mute Line and as long as it
is set as the recording device (aumix -l Record, or in KMix click on the red
dot below the device's level slider) everything works as expected. Hope this
helps.

Luca

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