On Mon, Jan 25, 2010 at 6:58 AM, Paulo Cavalcanti <promac@xxxxxxxxx> wrote:
This is the answer to my own question:
On Sun, Jan 24, 2010 at 10:31 PM, Paulo Cavalcanti <promac@xxxxxxxxx> 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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