On Mon, Jan 25, 2010 at 6:58 AM, Paulo Cavalcanti <pro...@gmail.com> wrote:
> > > On Sun, Jan 24, 2010 at 10:31 PM, Paulo Cavalcanti <pro...@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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