What is the pulseaudio way of recording?

[Paulo Cavalcanti]

On Mon, Jan 25, 2010 at 6:58 AM, Paulo Cavalcanti <promac at gmail.com> wrote:

>
>
> On Sun, Jan 24, 2010 at 10:31 PM, Paulo Cavalcanti <promac at gmail.com>wrote:
>
>> Hi,
>>
>> I have been recording using arecord and aplay this way:
>>
>> arecord -D default -d 0 -f cd | aplay -f cd -D default &
>>
>> The problem is that, while this works fine on rhel5, the same is no true
>> for Fedora 12 using pulseaudio, since I clearly hear some random noise
>> (specially at low volumes).
>>
>> Maybe this is related to the fact that the arecord process is consuming
>> 15% of my CPU (a quadcore, 2.4MHz). Compared to Audacious 2.2, for instance,
>> playing an mp3 file, which consumes only 4% of the CPU, this is really too
>> much.
>>
>> I concluded that the problem has to do with recording with pulseaudio
>> active.
>> I know there are parecord and paplay, but they are just symbolic links to
>> pacat,
>> and I do not know how to combine them in a similar way.
>>
>> Therefore, my question is what is the best way of recording with
>> pulseadio, without wasting too much of my CPU and without noise?
>>
>>
> In fact, 15% is the minimum. In general it can hit up to 30%.
>
> If I use
>
> arecord -D default -d 0 -f $tp | paplay &
>
> the consumption drops to 7% (much better), but still too far from the
> 0.3% I get on rhel5.
>
>
>
>

This is the answer to my own question:

parec | pacat &

No noise and CPU below 0.3%

-- 
Paulo Roma Cavalcanti
LCG - UFRJ
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